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Удод, Любовь Викторовна.
Влияние катионного замещения на полиморфные переходы в пирасаннате висмута Bi2Sn2O7 / Л. В. Удод, М. Н. Ситников // Вестник СибГАУ. - 2015. - Т. 16, № 4. - С. 975-982. - Библиогр.: 53. - Работа выполнена при финансовой поддержке Российского фонда фундаментальных исследований, грант № 15-42-04099 р_сибирь_а, и государственного задания № 114090470016 . - ISSN 1816-9724
Кл.слова (ненормированные):
полиморфные переходы -- диэлектрическая проницаемость -- электросопротивление -- катионное замещение -- дифференциальная сканирующая калориметрия -- polymorphic transitions -- dielectric permeability -- cation substitution -- electrical resistivity -- differential scanning calorimetry
Аннотация: Рассмотрена разработка технологии новых сенсорных материалов, необходимых для газочувствительных приборов, применяемых в ракетостроении. Целью данной работы является изучение влияния допирования разновалентными катионами на кристаллографическую структуру, диэлектрические и электрические свойства пирохлорного соединения Bi 2Sn 2O 7, обладающего селективной избирательностью к газам. Методом твердофазного синтеза впервые синтезированы соединения Bi2(Sn1-xMex)2O7, где Me = Mn, Cr, x = 0, 0,05, находящиеся сразу в двух полиморфных модификациях - орторомбической и кубической. В твердых растворах Bi2(Sn0,95Cr0,05)2O 7 методом сканирующей калориметрии обнаружено два новых структурных перехода, по сравнению со станнатом висмута Bi2Sn2O7. Ионы Mn 4+ сместили фазовые границы полиморфных переходов в сторону меньших температур, а фазовый α→β-переход около 370 К, характерный для Bi2(Sn1-xCrx)2O7, где x = 0, 0,05, подавили почти полностью. Полиморфный переход при Т = 543 К для Bi 2(Sn0,95Mn0,05) 2O 7 протекает с выделением тепла, в отличие от Bi2(Sn1-xCrx)2O7, где x = 0, 0,05. Исследована взаимосвязь структурных, электрических и диэлектрических свойств. Установлены аномалии в температурной зависимости электросопротивления и диэлектрической проницаемости (мнимой и реальной частями) как в области низких температур, так и при высоких температурах. Эти особенности объясняются в рамках модели мартенситных фазовых переходов. Методом сканирующей калориметрии найдены температуры структурных фазовых переходов, которые коррелируют с аномалиями электросопротивления в интервале температур 300 < T < 1000 К для Bi2(Sn1-xCrx)2O7, x = 0, 0,05.
The goal of this work is to develop a new technology of sensor materials required for gas sensing devices used in missile. The aim of this work is to study the effect of doping cations with different valency on the crystallographic structure, dielectric and electrical properties of pyrochlore compound Bi2Sn2O7 with selectivity to gases. Polycrystalline compounds Bi2(Sn1-xMex)2O7, where Me = Mn, Cr, x = 0, 0.05 have been synthesized by conventional solid-state reaction. According to the X-ray powder diffraction research, our sample consists of two polymorphs phases: cubic and rhombic. Two new structural transition are found in Bi2(Sn0.95Cr0.05)2O7 solid solutions by scanning calorimetry, as compared to bismuth pyrostannate Bi2Sn2O7. Ions Mn 4+ leads to shift of phase boundary of polymorphic transitions towards lower temperatures, and the phase α→β-transition at about 370 K, which is characteristic for Bi2(Sn1-xCrx)2O7, where x = 0, 0.05 is suppressed. The polymorphic transition at T = 543 K for Bi2(Sn0.95Mn0.05)2O7 occurs with calorification, in contrast to Bi2(Sn1-xCrx)2 7, where x = 0, 0.05. The relationship between structural, electrical and dielectric properties is investigated. Anomalies in the temperature dependence of electrical resistivity and dielectric permeability (real and imaginary part) as in the low region temperatures as in the high region temperature are found. These features are explained within a model of martensitic phase transitions. The temperature of the structural phase transitions correlates with temperature of maximum of the electrical resistivity in the temperature range 300 < T < 1000 K for Bi2(Sn1-xCrx)2O7, x = 0, 0.05 was found by scanning calorimetry method.

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Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Ситников, Максим Николаевич; Sitnikov, M.N.; Udod, L. V.
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    Диэлектрический метод измерения скрытой теплоты плавления льда при оттаивании мерзлой почвы / В. Л. Миронов [и др.] // Журн. радиоэлектрон. : электронный журнал. - 2018. - № 12. - Ст. 14, DOI 10.30898/1684-1719.2018.12.14. - Библиогр.: 14 . - ISSN 1684-1719
   Перевод заглавия: The dielectric method of measurement the latent heat of ice fusion during thawing of frozen soil
Кл.слова (ненормированные):
диэлектрическая модель -- диэлектрическая проницаемость -- мерзлые почвы -- незамерзшая вода -- незамерзающая вода -- связанная вода -- фазовые переходы -- дифференциальная сканирующая калориметрия -- dielectric model -- dielectric constant -- frozen soil -- unfrozen water -- nonfreezable water -- bound water -- phase transitions -- differential scanning calorimetry
Аннотация: Проведены экспериментальные исследования изменения массы незамерзшей воды, содержащейся в мерзлой Nа-бентонитовой глине в диапазоне температур от -30 до 0 °C и диапазоне массовых влажностей от 0 до 1 г/г с помощью диэлектрического метода. Предложен калориметрический метод измерения удельной скрытой теплоты плавления льда в связанную и несвязанную воду при нагревании мерзлой почвы. Предложен метод измерения скрытой теплоты плавления льда в мерзлой почве в процессе нагревания методом диэлектрических измерений. С целью обоснования предложенной методики проведено сравнение скрытой теплоты плавления льда при нагревании бентонитовой глины, полученной методом дифференциальной сканирующей калориметрии (ДСК), с рассчитанной с помощью диэлектрического метода.
Experimental studies of the change in the mass of unfrozen water contained in frozen Na-bentonite clay in the temperature range from -30 to 0 °C and a gravimetric moistures range from 0 to 1 g/g have been carried out by the dielectric method. The calorimetric method is proposed for measuring the specific latent heat of fusion of ice into bound and unbound water when the frozen soil is heated. The method of dielectric measurements is proposed for measuring the latent heat of fusion of ice in frozen soils during heating. In order to substantiate the proposed technique, the latent heat of fusion of ice in frozen bentonite clay measured by the differential scanning calorimetry during heating was compared with this value obtained by the dielectric method.

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Институт физики им. Л.В. Киренского СО РАН, 660036, г. Красноярск, ул. Академгородок, 50/38

Доп.точки доступа:
Миронов, Валерий Леонидович; Mironov, V. L.; Каравайский, Андрей Юрьевич; Karavaisky, A. Yu.; Лукин, Юрий Иванович; Lukin, Y. I.; Погорельцев, Евгений Ильич; Pogoreltsev, E. I.
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Unusual sequence of phase transitions in (NH4)3TiF7 detected by optic and calorimetric studies / S. V. Mel'nikova [et al.] // J. Fluor. Chem. - 2014. - Vol. 165. - P. 14-19, DOI 10.1016/j.jfluchem.2014.05.016. - Cited References: 13. - This work was supported by Russian Foundation for Basic Research (Grant no. 12-02-00056), and the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation (Grant no. NSh-924.2014.2). . - ISSN 0022-1139. - ISSN 1873-3328

РУБ Chemistry, Inorganic & Nuclear + Chemistry, Organic
Рубрики:
CRYSTAL-STRUCTURE
DIFFRACTION
NH4F
Кл.слова (ненормированные):
Cubic fluorides -- Phase transitions -- Crystal-optic -- Calorimetry
Аннотация: For the first time structural transformations were observed for one of the compounds belonging to the family of double salt fluorides A3MeF7 = A2MeF6·AF. Single crystals of (NH4)3TiF7 = (NH4)2TiF6·NH4F were grown by evaporation of the aqueous solution. Polarizing optical observations, heat capacity and birefringence Δn = (no − ne) measurements were performed in a wide temperature range 100–400 K. Two reversible, first order structural phase transitions were found to be followed by an unusual sequence of symmetry changes: cubic (G3) (T2↓ = 287.5 K; T2↑ = 291–310 K) ↔ P4/mnc (G2) (T1↓ = 358.5 K; T1↑ = 360 K) ↔ 4/m (G1). The twin structures observed were described assuming the existence of cubic parent phase G0 with P m 3 ¯ m symmetry.

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Держатели документа:
RAS, LV Kirensky Phys Inst, Siberian Dept, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660074, Russia
Russian Acad Sci, Inst Chem, Far Eastern Dept, Vladivostok 690022, Russia

Доп.точки доступа:
Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Flerov, I. N.; Флёров, Игорь Николаевич; Laptash, N. M.; Russian Foundation for Basic Research [12-02-00056]; Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation [NSh-924.2014.2]
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    Thermokinetic study of intermetallic phase formation in an Al/Cu multilayer thin film system / E. T. Moiseenko, V. V. Yumashev, R. R. Altunin [et al.] // Materialia. - 2023. - Vol. 28. - Ст. 101747, DOI 10.1016/j.mtla.2023.101747. - Cited References: 53. - This work was supported by the Russian Science Foundation under grant # 22-13-00313 . - ISSN 2589-1529
   Перевод заглавия: Термокинетическое исследование образования интерметаллических фаз в многослойной тонкопленочной системе Al/Cu
Кл.слова (ненормированные):
Intermetallics -- Thin film -- Solid-state reaction -- Kinetics -- Differential scanning calorimetry -- Electron diffraction
Аннотация: The solid-state reaction process in a multilayer thin film system (Al/Cu)50 has experimentally been studied using the methods of simultaneous thermal analysis (STA) and in situ electron diffraction. A detailed kinetic analysis of the phase formation processes during the solid-state reaction has shown that the observed solid-state transformations can be described by a statistically significant kinetic model where each stage corresponds to the reaction of the n-th order with autocatalysis. The low-temperature stage has been demonstrated to be attributable to the formation of the θ-Al2Cu phase, with the medium-temperature and high-temperature ones corresponding to the α2-AlCu3 and γ1-Al4Cu9 phases, respectively. The kinetic parameters for the formation of the phases θ-Al2Cu, α2-AlCu3 and γ1-Al4Cu9 have been determined. It has been shown that the kinetic model describing the solid-state reaction in the Al–Cu multilayer thin film system is in best agreement with the experimental data in the case of a competition between the formation stages of the α2-AlCu3 and γ1-Al4Cu9 phases.

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Держатели документа:
Siberian Federal University, 660041 79 Svobodny ave., Krasnoyarsk, Russia
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Akademgorodok 50/24, 660036 Krasnoyarsk, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50/38, 660036 Krasnoyarsk, Russia

Доп.точки доступа:
Moiseenko, E. T.; Yumashev, V. V.; Altunin, R. R.; Solovyov, L. A.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Belousov, O. V.; Zharkov, S. M.; Жарков, Сергей Михайлович
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The Sm2S3-X-SmS-Sm2O2S refractory system: thermal analysis, phase diagram, and properties of the phases / I. O. Yurev, A. S. Aleksandrovsky, D. N. Kamaev [et al.] // J. Therm. Anal. Calorim. - 2024. - Vol. 149, Is. 5. - P. 2057-2073, DOI 10.1007/s10973-023-12792-z. - Cited References: 90. - The authors thank Prof. P.P. Fedorov, Chief Researcher of Prokhorov Institute of General Physics, Russian Academy of Sciences, for scientific advices. The authors thank N.I. Lozhkin, engineer of the Department of Inorganic and Physical Chemistry, Tyumen State University for the technical support of the visual thermal analysis setup. The authors thank N.A. Shulaev, research engineer of the Center for Nature-Inspired Engineering, Tyumen State University, for determining the elemental composition of samples by scanning electron microscopy. The authors thank I.V. Palamarchuk, research engineer of the Center for Collective Use "Rational Nature Management and Physical and Chemical Research" of the Tyumen State University, for measuring the diffuse reflectance spectra. The authors thank Doctor of Philology O.V. Trofimova, Professor at the Institute of Social Sciences and Humanities of the Tyumen State University, for her advices on academic writing. - This study was funded by the Russian Science Foundation, Project No. 23–23-00488 “Search for EMF generation conditions in gradient ceramics of samarium monosulfide (SmS)” . - ISSN 1388-6150. - ISSN 1588-2926
Кл.слова (ненормированные):
Samarium sulfides -- Refractory system -- Thermal analysis -- Ternary eutectic -- Phase diagram -- Band gap
Аннотация: Samarium monosulfide, a strain gauge and barometric material, exists in equilibrium with Sm3S4 and Sm2O2S in the S-Sm–O system. Therefore, studying phase equilibria in the refractory Sm2S3-X-SmS-Sm2O2S system is a scientifically interesting task. In this system, 49 samples were synthesized and studied by powder XRD, differential scanning calorimetry, visual thermal analysis, and microstructural analysis. Melting points of Sm3S4, SmS, and Sm2O2S compounds were determined. Eutectic diagrams of Sm3S4-Sm2O2S, SmS-Sm2O2S, SmS-Sm3S4 systems were constructed. Temperatures and compositions of the binary eutectic points were determined. Fusion enthalpies for Sm3S4, SmS, and Sm2O2S phases were estimated using the Schröder–Le Chatelier equation. The liquidus lines were calculated using second-degree polynomials and Redlich–Kister model. Coordinates of the ternary eutectic point in the Sm3S4-SmS-Sm2O2S system were calculated using the cutting-plane method and the Scheffé method. The calculated compositions of ternary eutectic points were averaged at one most probable point, in accordance with the data on the samples microstructure. The experimental temperature of the ternary eutectic point coincides with the calculated values within the margin of error. Positions of eutectic valleys and approximate positions of isotherms in the system were established. Thermodynamic parameters of the α-Sm2S3 → γ-Sm2S3 polymorphic transition and the dependence of the Sm2S3-X composition on heat treatment conditions were determined. According to the scanning electron microscopy data, the approximate composition of the crystallized from the melt Sm2S3 sample is Sm2S2.95. The Sm10S14O phase decomposes at 1470 ± 15 °C in the course of a solid-phase reaction. The phase diagram of the Sm2S3-X-Sm2O2S system was revisited. Optical band gaps of Sm10S14O and Sm2O2S phases were determined. The Sm10S14O compound was optically characterized for the first time; its direct and indirect optical bandgaps were found equal to 2.48 and 2.37 eV, respectively. The determined direct and indirect optical bandgaps of Sm2O2S (4.4 eV and 3.95 eV, respectively) agree with the earlier measurements, thus confirming the accuracy of the chosen synthesis procedures.

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Institute of Chemistry, Tyumen State University, Volodarsky Str. 6, Tyumen, 625003, Russia
Department of Physical and Applied Chemistry, Kurgan State University, Sovetskaya Str. 63/4, Kurgan, 640020, Russian Federation
Federal Research Center KSC SB RAS, Kirensky Institute of Physics, Akademgorodok Str. 50, Building 38, Krasnoyarsk, 660036, Russia
Siberian Federal University, Svobodnyj Av. 79, Krasnoyarsk, 660079, Russia
Institute of Physical Materials Science, SB RAS, Sakhyanova Str. 6, Ulan-Ude, 670047, Russian Federation
Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, Pervomaiskaya Str. 91, Yekaterinburg, 620990, Russian Federation

Доп.точки доступа:
Yurev, I. O.; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Kamaev, D. N.; Polkovnikov, A. A.; Grigorchenko, V. M.; Yarovenko, A. A.; Zelenaya, A. E.; Parfenova, M. D.; Andreev, O. V.
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T − E phase diagrams and electrocaloric effect in PNN-PT solid solutions / M. V. Gorev, V. S. Bondarev, I. N. Flerov [et al.] // J. Alloys Compd. - 2022. - Vol. 927. - Ст. 167032, DOI 10.1016/j.jallcom.2022.167032. - Cited References: 40. - The authors are thankful to Dr. Anna Kalvane (Institute of Solid State Physics, University of Latvia) for preparation and characterization of the samples. This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors . - ISSN 0925-8388
Кл.слова (ненормированные):
Ferroelectrics -- Thermodynamic modeling -- Phase diagrams -- Electrocaloric -- Calorimetry
Аннотация: Using the sixth-order free energy expansion of the Landay thermodynamic potential, T − E phase diagrams and the electrocaloric effect (ECE) in solid solutions (1-x)Pb(Ni1∕3Nb2∕3)O3-xPbTiO3 (PNN-PT) were studied under an electric field along the crystallographic directions [001], [101] and [111]. The composition of the samples, temperature range, as well as magnitude and direction of the electric field significantly affect the sequence of phase transitions, stability of various crystalline phases and electrocaloric properties. Direct measurements of the intensive ECE in the 0.8PNN-0.2PT compound were carried out by the method of adiabatic calorimetry at electric field strength E = 6 kV/cm. The large electrocaloric coefficient ΔT∕ΔE = 10 μK ⋅ cm/kV indicates that this compound and other PNN-PT solutions are promising for application as solid-state refrigerants.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk, Russian Federation
Institute of Solid State Physics, University of Latvia, Riga, LV-1063, Latvia

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Flerov, I. N.; Флёров, Игорь Николаевич; Bormanis, K.; Birks, E.
}
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Synthesis, structure, and thermophysical properties of EuGaGe2O7 / L. T. Denisova, M. S. Molokeev, L. A. Irtyugo [et al.] // Inorg. Mater. - 2020. - Vol. 56, Is. 8. - P. 854-858, DOI 10.1134/S002016852008004X. - Cited References: 18 . - ISSN 0020-1685. - ISSN 1608-3172

РУБ Materials Science, Multidisciplinary
Рубрики:
TEMPERATURE HEAT-CAPACITY
THERMODYNAMIC PROPERTIES
CRYSTAL-STRUCTURE
Кл.слова (ненормированные):
europium gallium germanate -- solid-state synthesis -- differential scanning calorimetry -- heat capacity -- structure -- thermodynamic properties
Аннотация: The europium gallium germanate EuGaGe2O7 has been prepared by solid-state reaction in air in the temperature range 1273–1473 K using a stoichiometric mixture of Eu2O3, Ga2O3, and GeO2. Its crystal structure has been determined by X-ray diffraction (sp. gr. P21/c, a = 7.1693(7) Å, b = 6.57008(6) Å, c = 12.7699(1) Å, β = 117.4522(5)°, V = 533.768(8) Å3). The heat capacity of polycrystalline samples has been determined by differential scanning calorimetry in the temperature range 350–1053 K and the experimental data have been used to calculate the thermodynamic properties (enthalpy increment, entropy change, and reduced Gibbs energy change) of EuGaGe2O7.

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Публикация на русском языке Синтез, структура и теплофизические свойства EuGaGe2O7 [Текст] / Л. Т. Денисова, М. С. Молокеев, Л. А. Иртюго [и др.] // Неорган. матер. - 2020. - Т. 56 № 8. - С. 901-905

Держатели документа:
Siberian Fed Univ, Inst Nonferrous Met & Mat Sci, Svobodnyi Pr 79, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Siberian Branch, Fed Res Ctr, Kirensky Inst Phys,Krasnoyarsk Sci Ctr, Akademgorodok 50-38, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Ul Akad Kirenskogo 28-12 B, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Baikov Inst Met & Mat Sci, Leninskii Pr 49, Moscow 119991, Russia.

Доп.точки доступа:
Denisova, L. T.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Irtyugo, L. A.; Beletskii, V. V.; Kargin, Yu. F.; Denisov, V. M.
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Synthesis, structure and magnetic properties of monoclinic lanthanum-chromium borate LaCr3(BO3)4 / E. A. Volkova, M. S. Platunov, A. M. Antipin [et al.] // J. Alloys Compd. - 2024. - Vol. 994. - Ст. 174683, DOI 10.1016/j.jallcom.2024.174683. - Cited References: 38. - Single crystal X-ray analysis was carried out within the State assignment NRC "Kurchatov institute" (research contribution of A.M.A.). The research contribution of M.S.P. was partially supported by the Ministry of Science and Higher Education of the Russian Federation within the governmental assignment for Synchrotron radiation facility "SKIF", Boreskov Institute of Catalysis (project FWUR-2024–0040) . - ISSN 0925-8388. - ISSN 1873-4669
Кл.слова (ненормированные):
Borates -- Flux growth -- Crystal structure -- Differential scanning calorimetry -- Powder X-ray diffraction -- IR spectroscopy -- Antiferromagnet
Аннотация: Single crystals of LaCr3(BO3)4 were synthesized through spontaneous nucleation from a K2Mo3O10 flux melt. The crystal structure was determined using single-crystal X-ray diffraction (XRD) at temperatures of 293 K and 85 K. LaCr-borate crystallizes in the monoclinic C2/c space group with unit cell parameters a = 7.47980(5) Å, b = 9.55180(7) Å, c = 11.48330(8) Å, β= 104.0060(6)°, V = 796.04(1) Å3 (for C1, T = 293 K), and a = 7.47380(5) Å, b = 9.55520(7) Å, c = 11.47100(8) Å, β = 103.9330(6)°, V = 795.08(1) Å3 (for C2, T = 85 K), each with Z = 4. The temperature dependence of the unit cell parameters, including the monoclinic angle (β) and the unit cell volume (V), was investigated over the range of 85–293 K. No structural phase transitions were observed in the low-temperature region down to 85 K. Differential scanning calorimetry (DSC) measurements revealed no high-temperature phase transitions between 50 and 1350°C. Infrared (IR) spectroscopy confirmed the monoclinic structure of LaCr3(BO3)4 crystals, revealing characteristic absorption bands, including the lowest frequency mode associated with the translational vibrations of the La3+ ion.

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Faculty of Geology, Lomonosov Moscow State University, Moscow, Russian Federation
Synchrotron radiation facility SKIF, Boreskov Institute of Catalysis SB RAS, Kol’tsovo, Russian Federation
Shubnikov Institute of Crystallography, Complex "Crystallography and Photonics", NRC "Kurchatov institute", Moscow, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, Russian Federation
Melnikov Research Institute of Comprehensive Exploitation of Mineral Resources of the Russian Academy of Sciences, Moscow, Russian Federation

Доп.точки доступа:
Volkova, E. A.; Platunov, M. S.; Платунов, Михаил Сергеевич; Antipin, A. M.; Alpanova, R. R.; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Pyastolova, Yu. V.; Пястолова, Юлия Валентиновна; Podobraznyh, A. D.; Kosorukov, V. L.; Koporulina, E. V.; Maltsev, V. V.
}
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    Structure and properties of phases in the Cu2-ХSe-Sb2Se3 system. The Cu2-XSe-Sb2Se3 phase diagram / M. A. Shtykova, M. S. Molokeev, B. A. Zakharov [et al.] // J. Alloys Compd. - 2022. - Vol. 906. - Ст. 164384, DOI 10.1016/j.jallcom.2022.164384. - Cited References: 111. - The research was supported for R.S. Bubnova by the Ministry of Science and Higher Education of the Russian Federation within the scientific tasks of the Institute of Silicate chemistry (Russian Academy of Sciences) [project number 0097-2019-0013]. The equipment of Research and Education Center "Molecular design and ecologically safe technologies" (Novosibirsk State University) was used for single-crystal X-ray diffraction experiments. BAZ and EVB acknowledge support by the Ministry of Science and Higher Education, project AAAA-A21-121011390011-4 . - ISSN 0925-8388
   Перевод заглавия: Структура и свойства фаз в системе Cu2-xSe-Sb2Se3; фазовая диаграмма Cu2-xSe-Sb2Se3
Кл.слова (ненормированные):
Phase equilibria -- Phase diagram -- High-temperature X-ray diffraction -- Redlich-Kister polynomial model -- Scanning electron microscopy -- Differential scanning calorimetry
Аннотация: The phase diagram of the Cu2−XSe-Sb2Se3 system is revisited to clarify ambiguity/disagreement in previously reported data. Ternary Cu3SbSe3 and CuSbSe2 compounds were obtained. In order to confirm that the phases have been identified correctly, crystal structures were solved, and the energy band gaps measured. For the sample containing 75 mol% Sb2Se3 and 25 mol% Cu1.995Se the temperature range of the stability of the high-temperature CuSb3Se5 phase was determined for the first time. This phase is formed at 445 °С, decomposes following a peritectic reaction at 527 °С, and can be quenched. A high-temperature X-ray diffraction study of a sample containing 75 mol% Sb2Se3 and 25 mol% Cu2Se allowed us to measure the thermal expansion of the CuSbSe2 and Sb2Se3 phases present in the sample. The anisotropy of thermal expansion of CuSbSe2 is similar to that of As2S3 (orpiment); thermal expansion of Sb2Se3 is similar to that of AsS (realgar). The 6 balance equations of the invariant phase transformations involving all the ternary compounds existing in the Cu2−XSe-Sb2Se3 system were suggested for the first time. The temperature and the enthalpies of all these transformations were measured. A phase diagram of the Cu2−XSe-Sb2Se3 system was found for the first time in all the range of concentrations at temperatures from ambient to the complete melting. This diagram takes into consideration the phase equilibria that involve all the ternary compounds that are possible in this system. The liquidus of the Cu2−XSe-Sb2Se3 system was calculated according to Redlich-Kister equation; it agrees with the experimental data within 1–17 °С.

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Department of Inorganic and Physical Chemistry, Institute of Chemistry, Tyumen State University, Volodarsky str. 6, Tyumen, 625003, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok Str. 50, Building 38, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Svobodnyj av. 79, Krasnoyarsk, 660079, Russian Federation
Boreskov Institute of Catalysis SB RAS, Lavrentiev Ave. 5, Novosibirsk, 630090, Russian Federation
Novosibirsk State University, Pirogova str. 2, Novosibirsk, 630090, Russian Federation
Department of Condensed Matter Physics and Nanoscale Systems, Institute of Natural Sciences and Mathematics, Ural Federal University, Mira str. 19, Yekaterinburg, 620002, Russian Federation
Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, Makarov Emb., 2, St. Petersburg, 199034, Russian Federation
Department of Physical and Applied Chemistry, Institute of Natural Sciences and Mathematics, Kurgan State University, Sovetskaya str. 2, b. 4, Kurgan, 640020, Russian Federation
Laboratory of Electron and Probe Microscopy, REC “Nanotechnology”, Tyumen State University, Volodarsky str. 6, Tyumen, 625003, Russian Federation
Engineering Center of Composite Materials Based on Tungsten Compounds and Rare Earth Elements, Tyumen State University, Volodarsky str. 6, Tyumen, 625003, Russian Federation
Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, Pervomaiskaya str. 91, Yekaterinburg, 620990, Russian Federation

Доп.точки доступа:
Shtykova, M. A.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zakharov, B. A.; Selezneva, N. V.; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Bubnova, R. S.; Kamaev, D. N.; Gubin, A. A.; Habibullayev, N. N.; Matigorov, A. V.; Boldyreva, E. V.; Andreev, O. V.
}
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10.

    Structural transformation between two cubic phases of (NH4)3SnF7 / I. N. Flerov [et al.] // J. Fluor. Chem. - 2015. - Vol. 178. - P. 86-92, DOI 10.1016/j.jfluchem.2015.06.024. - Cited References: 19. - We thank T.A. Kaidalova for the idea of doubling the unit cell parameter of (NH4)3SnF7 at room temperature. The reported study was partially supported by RFBR, research project No. 15-02-02009 a. . - ISSN 0022-1139
   Перевод заглавия: Структурный переход между двумя кубическими фазами в (NH4)3SnF7

РУБ Chemistry, Inorganic & Nuclear + Chemistry, Organic
Рубрики:
CRYSTAL-STRUCTURE
TRANSITION
NH4F
Кл.слова (ненормированные):
Cubic fluorides -- Phase transitions -- X-ray -- Calorimetry -- Crystal optics
Аннотация: Reinvestigations of the room temperature structure of ammonium heptafluorostannate (NH4)3SnF7 = (NH4)2SnF6·NH4F = (NH4)3[SnF6]F by both powder and single crystal X-ray diffractions have revealed that its real symmetry is Pa−3 (Z = 8) instead of Pm−3m (Z = 1) suggested earlier. Polarizing optical observations, heat capacity, X-ray powder, and single crystal measurements were performed in a wide temperature range (100–420 K). A reversible structural phase transition of the first order between two cubic modifications Pa−3 ↔ Pm−3m was found at about T0 = 360 K. The structural models associated with partially disordered and totally ordered high and low temperature phases, respectively, comply with a large value of phase transition entropy.

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Держатели документа:
L.V. Kirensky Institute of Physics, Siberian Branch of RAS, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Far Eastern State Transport University, Khabarovsk, Russian Federation
Institute of Chemistry, Far Eastern Branch of RAS, Vladivostok, Russian Federation

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Laptash, N. M.; Udovenko, A. A.; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Misyul, S. V.; Мисюль, Сергей Валентинович
}
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11.

Phase transitions in Cs2CdI4 single crystals / K. S. Aleksandrov [et al.] // Phys. Status Solidi A. - 1988. - Vol. 105, Is. 2. - P. 441-446 . - ISSN 0031-8965
Кл.слова (ненормированные):
CALORIMETRY -- CRYSTALS - Structure -- DIELECTRIC PROPERTIES -- OPTICAL PROPERTIES -- X-RAY ANALYSIS -- BIREFRINGENCE -- CESIUM CADMIUM IODIDE -- DIELECTRIC PERMEABILITY -- SPECIFIC HEAT -- SYMMETRY -- CESIUM COMPOUNDS
Аннотация: Cs//2CdI//4 crystals were grown from the melt (A) and from water solution (B). Optic, dielectric, X-ray, and calorimetric investigations were carried out. Crystal A shows three phase transitions at 332. 3, 259. 6, and 183. 4 K with the following sequence of phases: commensurate orthorhombic of beta -K//2SO//4 type ( alpha //0 equals 1. 074, b//0 equals 0. 8458, c equals 1. 4852 nm) B ARR LR incommensurate B ARR LR monoclinic ferroelastic (P2//1/n) B ARR LR triclinic ferroelastic (P1 OVER BAR ). The B-crystal belongs to monoclinic symmetry (P2//1/m) and undergoes transformation into the orthorhombic phase of beta -K//2SO//4 type at 420 K.

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Держатели документа:
USSR Acad of Sciences, Krasnoyarsk, USSR, USSR Acad of Sciences, Krasnoyarsk, USSR

Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Melnikova, S. V.; Мельникова, Светлана Владимировна; Flerov, I. N.; Флёров, Игорь Николаевич; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Kruglik, A. I.; Круглик, Анатолий Иванович; Kokov, I. T.
}
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12.

    Phase transitions and thermodynamic properties of (NH4)(3)VO2F4 cryolite / V. D. Fokina [et al.] // Solid State Sci. - 2009. - Vol. 11, Is. 4. - P. 836-840, DOI 10.1016/j.solidstatesciences.2008.11.004. - Cited Reference Count: 17. - Гранты: The authors are grateful to Dr. SM. Mel'nikova for the permission to use the unpublished results.; This work was supported by the Russian Foundation for Basic Research (project 06-02-16102). - Финансирующая организация: Russian Foundation for Basic Research [06-02-16102] . - ISSN 1293-2558
Рубрики:
PEROVSKITE-LIKE OXYFLUORIDES
   (NH4)(3)TIOF5
   CS
   (NH4)(3)WO3F3
   DIFFRACTION
   (NH4)3VO2F4
   ELPASOLITE
   METALS
   RB
Кл.слова (ненормированные):
Oxyfluorides -- Phase transition -- Calorimetry -- Phase diagram -- Ferroelectricity -- Calorimetry -- Ferroelectricity -- Oxyfluorides -- Phase diagram -- Phase transition -- Calorimetry -- Ferroelectricity -- Halide minerals -- Phase diagrams -- Sugar (sucrose) -- Thermodynamic properties -- Calorimetric measurements -- Cubic phase -- First-order phase transitions -- Heat capacities -- Oxyfluorides -- Phase transition temperatures -- Pressure dependences -- Structural transformations -- Temperature ranges -- Phase transitions
Аннотация: Calorimetric measurements performed in a wide temperature range on (NH4)(3)VO2F4 have shown the presence of four heat capacity anomalies at T-1 = 438 K, T-2 = 244 K, T-3 = 210.2 K, T-4 = 205.1 K associated with the first order phase transitions. In accordance with the permittivity behavior, the structural transformations are of nonferroelectric nature. Pressure dependence of the phase transition temperatures has been studied by DTA under pressure. The entropy of phase transitions is analyzed mainly in the framework of the orientational disordering of NH4+ and VO2F43- ions in a cubic phase. (C) 2008 Elsevier Masson SAS. All rights reserved.

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Держатели документа:
RAS, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660074, Russia

Доп.точки доступа:
Fokina, V. D.; Фокина, Валентина Дмитриевна; Gorev, M. V.; Горев, Михаил Васильевич; Kocharova, A. G.; Кочарова, Алла Георгиевна; Flerov, I. N.; Флёров, Игорь Николаевич; Pogoreltsev, E.I.
}
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13.

Optical and X-ray studies of mixed crystals CsxRb1-xLiSO4 / S. V. Melnikova [et al.] // Ferroelectrics : Proceedings of the 1994 5th Russian-Japanese Symposium on Ferroelectricity. Part 2 (of 2) (22 August 1994 through 27 August 1994, Moscow, Russia. - 1995. - Vol. 170, Is. 1. - P. 139-143 . - ISSN 0015-0193
Кл.слова (ненормированные):
Birefringence -- Cesium compounds -- Differential scanning calorimetry -- Phase diagrams -- Phase transitions -- Polarization -- Single crystals -- Solid solutions -- Thermal effects -- Twinning -- X ray analysis -- Mixed crystals -- Ferroelectric materials
Аннотация: (T-x) phase diagram has been investigated by polarizing optic and birefringence methods, differential scanning calorimetry and X-ray study. A small amount of rubidium in CsLiSO4 as well as cesium in RbLiSO4 reduces the temperature of transition into ferroelastic phase P1121/n which disappear for x?0.15 and x?0.9. The region of phase P21/c11 (c = 2c0) expands and becomes the most stable below ambient temperature for 0.9>x>0.2.

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Доп.точки доступа:
Melnikova, S. V.; Мельникова, Светлана Владимировна; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Grankina, V. A.; Voronov, V. N.; Воронов, Владимир Николаевич; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Russian-Japanese symposium on ferroelectricity(1994 ; Aug. ; 22-27 ; Moscow)
}
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14.

Morozov, E. V.
Probing flocculant-induced asphaltene precipitation via NMR imaging: from model toluene-asphaltene systems to natural crude oils / E. V. Morozov, O. N. Martyanov // Appl. Magn. Reson. - 2016. - Vol. 47, Is. 2. - P. 223-235, DOI 10.1007/s00723-015-0741-9. - Cited References:46. - This research was performed with the financial support of Russian Science Foundation (project no. 15-19-00119). . - ISSN 0937-9347. - ISSN 1613-7507

РУБ Physics, Atomic, Molecular & Chemical + Spectroscopy
Рубрики:
PETROLEUM ASPHALTENES
   MOLECULAR-DYNAMICS
   AGGREGATION
   MICROSCOPY
   SCATTERING
   RESONANCE
   SEDIMENTATION
   ASSOCIATION
   CALORIMETRY
   RELAXATION
Аннотация: An nuclear magnetic resonance (NMR) imaging approach for studying flocculant-induced asphaltene precipitation processes is introduced in this report. Unlike commonly accepted techniques, which primarily measure aggregation processes on the submicron scale (the level of asphaltene molecules and their aggregates), NMR imaging demonstrates the capability to obtain new useful information about bulk system behavior on the macro scale. To reveal the capabilities of the method, the model toluene-asphaltene system and two samples of natural crude oils with different chemical composition and physical properties (such as asphaltene content and density) were employed for experiments. The process of colloidal suspension formation and two different patterns of its evolution were observed depending on both the asphaltene content and the flocculant concentration. In the first pattern, the flocculant-induced precipitation leads to the slow uniform compacting of the suspension and descent of the sedimentation front, whereas the second pattern is characterized by sediment accumulation and the upwards drift of the front. It was found that the behavior of the precipitated asphaltenes in the model system correlates well with those observed in natural crude oils. The results achieved in this work are in agreement with the data obtained previously via other techniques. Thus, NMR imaging proved to be an efficient method for probing flocculant-induced precipitation in crude oils.

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Держатели документа:
Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Akademgorodok 50-24, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Akademgorodok 50-24, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Siberian Branch, Boreskov Inst Catalysis, Pr Ak Lavrentieva 5, Novosibirsk 630090, Russia.
Novosibirsk State Univ, Pirogova St 2, Novosibirsk 630090, Russia.

Доп.точки доступа:
Martyanov, O. N.; Морозов, Евгений Владимирович; Russian Science Foundation [15-19-00119]
}
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15.

Mixed-valence hydrated iron fluoridotitanate: synthesis, optics and calorimetry / S. V. Mel'nikova, N. M. Laptash, M. V. Gorev, E. I. Pogoreltsev // J. Phys. Chem. Solids. - 2020. - Vol. 142. - Ст. 109444, DOI 10.1016/j.jpcs.2020.109444. - Cited References: 35 . - ISSN 0022-3697
Кл.слова (ненормированные):
Crystal growth -- Fluoridotitanate -- Mixed valence -- Phase transition -- Optical properties -- Heat capacity
Аннотация: Mixed-valence hydrated fluoridotitanate with idealized formula FeTiF6·6H2O is the main product of fluoride processing of natural mineral ilmenite with hydrofluoric acid. Its single crystals were grown and optical and calorimetric experiments were carried out in the temperature range 200–350 K. Charge re-distribution, Fe2+Ti4+ to Fe3+Ti3+, in the compound studied was evident in XPS spectra. A first order ferroelastic phase transition occurs at temperatures T0↓ = 271.5 K, T0↑ = 274 ÷ 275.5 K with the symmetry change P3‾↔ P1‾. The structural transformation is accompanied by the appearance of a very weak optical anisotropy in the slice (001), a small anomaly of the heat capacity (ΔS = 1.5 J/mol K = 0.2R), and positive baric coefficients dT0/dp ≈ 30 ± 10 K/GPa.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Chemistry, Far Eastern Branch of RAS, Vladivostok, 690022, Russian Federation
Siberian Federal University, Krasnoyarsk, 660074, Russian Federation

Доп.точки доступа:
Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Laptash, N. M.; Gorev, M. V.; Горев, Михаил Васильевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич
}
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16.

    Mel'nikova, S. V.
    Phase transformation in some hexahydrated metal(II) fluorogermanates and fluorotitanates: Optical and differential scanning calorimetry studies / S. V. Mel'nikova, N. M. Laptash, E. I. Pogoreltsev // J. Fluor. Chem. - 2022. - Vol. 263. - Ст. 110048, DOI 10.1016/j.jfluchem.2022.110048. - Cited References: 31 . - ISSN 0022-1139
   Перевод заглавия: Фазовые превращения в некоторых гексагидратированных фторгерманатах и фтортитанатах металлов(II): оптические исследования и дифференциальная сканирующая калориметрия
Аннотация: Large single crystals of hydrated fluorides CoGeF6∙6H2O, FeGeF6∙6H2O, CoTiF6∙6H2O, and ZnTiF6∙6H2O were obtained and their birefringence and heat capacities have been studied. The compounds undergo a phase transition (PT) of the first order, which is accompanied by a change in optical anisotropy, twinning, and a decrease in the compound symmetry from trigonal (m, ) to monoclinic (Р21/c) in accordance with the rotation of the optical indicatrix around only one direction. The value of the entropy change during the PT is small for the first two compounds (0.36R and 0.34R) and large for the last two (0.76R and 0.95R).

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC, Siberian Branch of RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Chemistry, Far Eastern Branch of RAS, Vladivostok, 690022, Russian Federation
Siberian Federal University, Krasnoyarsk, 660074, Russian Federation

Доп.точки доступа:
Laptash, N. M.; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Мельникова, Светлана Владимировна
}
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17.

Magnetic and specific heat properties of YFe3(BO3)(4) and ErFe3(BO3)(4) / E. A. Popova [et al.] // J. Phys.: Condens. Matter. - 2010. - Vol. 22, Is. 11. - Ст. 116006, DOI 10.1088/0953-8984/22/11/116006. - Cited References: 26. - This work was supported by DFG grants 436 RUS and HE 3439/6 (FOR 520). The authors are indebted to M N Popova and B Z Malkin for valuable discussions. . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
LINEAR-CHAIN ANTIFERROMAGNETISM
   CRYSTAL-STRUCTURE
   GDFE3(BO3)(4)
   MULTIFERROICS
   BA2COS3
   ORDER
Кл.слова (ненормированные):
Antiferromagnetic orders -- Basal planes -- Experimental data -- Magnetically ordered state -- Antiferromagnetism -- Calorimetry -- Erbium -- Magnetic moments -- Single crystals -- Specific heat -- Magnetic domains
Аннотация: The present paper reports on the specific heat and magnetization of the YFe3(BO3)(4) and ErFe3(BO3)(4) single crystals. In both compounds, antiferromagnetic order of the iron spins evolves at T-N = 38 K. The experimental data suggest that the magnetic moments are in the basal plane of the trigonal crystal for both compounds. In the magnetically ordered state the crystal is subdivided into three types of domains, the magnetic moments of the Fe3+ ions being aligned along the a axis within each domain. For ErFe3(BO3)(4), two non-equivalent magnetic positions of the Er3+ ions in each domain are observed.

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Держатели документа:
[Popova, E. A.] Tech Univ, Moscow State Inst Elect & Math, Moscow 109028, Russia
[Vasiliev, A. N.] Moscow MV Lomonosov State Univ, Low Temp Phys & Superconduct Dept, Moscow 119991, Russia
[Temerov, V. L.
Bezmaternykh, L. N.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Tristan, N.
Klingeler, R.
Buechner, B.] Leibniz Inst Solid State & Mat Res IFW Dresden, D-01171 Dresden, Germany
ИФ СО РАН
Moscow State Institute of Electronics and Mathematics (Technical University), 109028 Moscow, Russian Federation
Low Temperature Physics and Superconductivity Department, Moscow State University, 119991 Moscow, Russian Federation
L v Kirensky Institute of Physics, Siberian Branch of RAS, Krasnoyarsk 660036, Russian Federation
Leibniz-Institute for Solid State and Materials Research IFW Dresden, D-01171 Dresden, Germany

Доп.точки доступа:
Popova, E. A.; Vasiliev, A. N.; Temerov, V. L.; Темеров, Владислав Леонидович; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Tristan, N.; Klingeler, R.; Buchner, B.
}
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18.

Investigation of ferroelectric phase transitions in CsLiMoO//4 type crystals / K. S. Aleksandrov [et al.] // Ferroelectrics. - 1983. - Vol. 54, Is. 1. - P. 573-576 . - ISSN 0015-0193
Кл.слова (ненормированные):
CALORIMETRY -- CESIUM COMPOUNDS - X-Ray Analysis -- PHASE TRANSITIONS -- FERROELECTRIC MATERIALS
Аннотация: X-ray and calorimetric investigations of successive phase transitions (PTs) in crystals of CsLiMoO//4 type were made. The theoretical model description of these PTs as of order-disorder type ones is suggested and thermodynamical properties of the model are discussed.

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Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Blat, D. H.; Zinenko, V. I.; Зиненко, Виктор Иванович; Iskornev, I. M.; Kruglik, A. I.; Flerov, I. N.; Флёров, Игорь Николаевич; European Meeting on Ferroelectricity(5 ; 1983 ; Sept. ; 26-30 ; Malaga, Sp)
}
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19.

Heat capacity, entropy, dielectric properties and T–p phase diagram of (NH4)3TiF7 / E. I. Pogoreltsev [et al.] // J. Fluor. Chem. - 2014. - Vol. 168. - P. 247-250, DOI 10.1016/j.jfluchem.2014.10.016. - Cited References: 16. - This work was supported by the Russian Foundation for Basic Research (Grant no. 15-02-02009), and the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation (Grant no. NSh-924.2014.2). . - ISSN 0022-1139. - ISSN 1873-3328

РУБ Chemistry, Inorganic & Nuclear + Chemistry, Organic
Рубрики:
CRYSTAL-STRUCTURE
   TRANSITIONS
   FLUORIDES
   NH4F
Кл.слова (ненормированные):
Cubic fluorides -- Phase transitions -- Dielectric -- Phase diagram -- Calorimetry
Аннотация: Successive phase transitions G1 --> G2 --> G3 in the double salt (NH4)(3)TiF7 have been studied by detailed calorimetric, DTA under hydrostatic pressure and dielectric measurements. Rather large entropy jumps at phase transition points were found to be followed by large additional contributions associated with the temperature dependence of the excess heat capacity. The permittivity behaviour and the tangent of the dielectric losses proved the nonferroelectric nature of both transformations. Two triple-points were found on the temperature-pressure phase diagram, suggesting the existence of a hypothetical parent G0 = Pm-3m cubic phase. A direct transformation between high (G0) and low (G3) temperature cubic phases takes place at p > 0.41 GPa with a baric coefficient dT(G0) --> (G3)/dp = -40 K/GPa. (C) 2014 Elsevier B.V. All rights reserved.

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Держатели документа:
RAS, Siberian Dept, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660074, Russia
Krasnoyarsk State Agr Univ, Krasnoyarsk 660049, Russia
Russian Acad Sci, Far Eastern Dept, Inst Chem, Vladivostok 690022, Russia

Доп.точки доступа:
Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Flerov, I. N.; Флёров, Игорь Николаевич; Kartashev, A. V.; Карташев, Андрей Васильевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Laptash, N. M.; Russian Foundation for Basic Research [15-02-02009]; Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation [NSh-924.2014.2]
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20.

Heat capacity study of relaxors BaTi0.65Zr0.35O3 and BaTi0.60Zr0.40O3 / M. . Gorev [et al.] // J. Phys.: Condens. Matter. - 2006. - Vol. 18, Is. 17. - P. 4407-4416, DOI 10.1088/0953-8984/18/17/026. - Cited References: 21 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
CERAMICS
BA(TI1-XZRX)O-3
BATIO3
Кл.слова (ненормированные):
Calorimetry -- Composition -- Data reduction -- Lead compounds -- Mathematical models -- Permittivity -- Specific heat -- Adiabatic calorimetry -- Burns temperature -- Diffuse anomalies -- Barium compounds
Аннотация: The heat capacity of two relaxors BaTi(1-x)ZrxO(3) (x = 0.35, 0.40) was measured using adiabatic calorimetry in the temperature range 100-360 K. The Cp(T) dependence of both compositions is characterized by the presence of two diffuse anomalies near the Burns temperature T-d and the temperature of the maximum in permittivity T-m in the temperature ranges 250-350 K and 120 200 K. The anomalous heat capacity near T-d was analysed taking into account the distribution of Zr concentration in nanoregions leading to the distribution of their transition temperatures into the polar phase. Excess heat capacity near Tm was discussed in the framework of the spherical random bond-random field model. The results are compared with the data obtained by the same procedures for PbMg1/3Nb2/3O3 studied experimentally earlier.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
CNRS, CEMES, F-31055 Toulouse, France
ИФ СО РАН
L V Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
CEMES-CNRS, 31055 Toulouse, France

Доп.точки доступа:
Gorev, M.; Bondarev, V.; Sciau, P.; Savariault, J. M.
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