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Теплофизические свойства керамики ниобата натрия в широкой области температур / В. С. Бондарев [и др.] // Физ. тверд. тела. - 2013. - Т. 55, Вып. 4. - С. 752-758. - Работа выполнена при финансовой поддержке гранта Президента РФ по поддержке ведущих научных школ РФ (НШ-4828.2012.2) и гранта РФФИ N 12-02-31799\_мол\_а.
Аннотация: Выполнены исследования теплоемкости Cp(T) и коэффициента теплового расширения alpha(T) керамики NaNbO3 в области температур 2-800 K. Помимо аномалий, связанных с известными фазовыми переходами при T6~265 K, T5~638 K, T4~760 K и T3~793 K, обнаружены особенносaти поведения Cp(T) и alpha(T) вблизи T5''~500 K и T5'~600 K. Установлено, что все наблюдавшиеся структурные превращения в соответствии с величинами изменения энтропии не связаны с процессами упорядочения структурных элементов. Показано, что с ростом температуры объем ячейки при фазовых переходах вблизи 265, 515, 604 и 638 K убывает. Исследованы особенности перехода в фазу R3c . Проведен анализ двух возможных сценариев реализации последовательности фазовых превращений в интервале между T5 и T6.

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Переводная версия Thermal and physical properties of sodium niobate ceramics over a wide temperature range. - [Б. м. : б. и.]

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

Доп.точки доступа:
Бондарев, Виталий Сергеевич; Bondarev V.S.; Карташев, Андрей Васильевич; Kartashev A.V.; Горев, Михаил Васильевич; Gorev M.V.; Флёров, Игорь Николаевич; Flerov, I. N.; Погорельцев, Евгений Ильич; Pogoreltsev E.I.; Молокеев, Максим Сергеевич; Molokeev M.S.; Раевская, С. И.; Суздалев, Д. В.; Раевский, И. П.
}
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Thermal and physical properties of sodium niobate ceramics over a wide temperature range / V. S. Bondarev [et al.] // Phys. Solid State. - 2013. - Vol. 55, Is. 4. - P. 821-828DOI 10.1134/S1063783413040045
Аннотация: The temperature dependences of the heat capacity C p (T) and thermal expansion coefficient α(T) of NaNbO3 ceramic samples have been investigated in the temperature range from 2 to 800 K. In addition to the anomalies associated with the known phase transitions at temperatures T 6 ≈ 265 K, T 5 ≈ 638 K, T 4 ≈ 760 K, and T 3 ≈ 793 K, anomalies in the behavior of C p (T) and α(T) have been observed near T 5″ ≈ 500 K and T 5′ ≈ 600 K. It has been found that all the observed structural transformations, according to the values of the entropy change, are not related to the ordering of structural elements. It has been shown that, with an increase in the temperature, the unit cell volume during the phase transitions near 265, 515, 604, and 638 K decreases. The specific features of the transition to the phase R3c have been examined. Two possible scenarios of the sequence of phase transformations in the temperature range between T 5 and T 6 have been analyzed.

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Публикация на русском языке Теплофизические свойства керамики ниобата натрия в широкой области температур // Физика твердого тела. - 2013. - Т. 55, Вып. 4. - С. 752-758

Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660074, Russia
Southern Fed Univ, Inst Phys Res, Rostov Na Donu 344090, Russia

Доп.точки доступа:
Bondarev, V. S.; Бондарев, Виталий Сергеевич; Kartashev, A. V.; Карташев, Андрей Васильевич; Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Raevskaya, S. I.; Suzdalev, D. V.; Raevskii, I. P.
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Synthesis and structural properties of cubic G0-Rb2KMoO3F3 oxyfluoride / V. V. Atuchin [et al.] // Ceram. Int. - 2012. - Vol. 38, Is. 3. - P. 2455-2459, DOI 10.1016/j.ceramint.2011.11.013. - Cited References: 23. - This study was partly supported by RFBR (Grant 09-02-00062) and SB RAS (Grant 34). . - ISSN 0272-8842

РУБ Materials Science, Ceramics
Рубрики:
PHASE-TRANSITIONS
   FERROELECTRIC K3WO3F3
   (NH4)(3)MOO3F3
   TEMPERATURE
   PEROVSKITE
   ELPASOLITE
   CRYSTALS
   BEHAVIOR
   High temperature
   Melt solidification
   Micromorphologies
   Melt solidification
   Microstructure-final
   Oxyfluorides
   Space Groups
   Oxyfluorides
   X ray methods
Кл.слова (ненормированные):
Powders: solid state reaction -- Microstructure-final -- X-ray methods -- Alkali oxides -- Halides
Аннотация: High-temperature G0 polymorph of Rb2KMoO3F3 has been prepared by melt solidification. Micromorphology and chemical properties of the final product were evaluated by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The elpasolite-related crystal structure of G0-Rb2KMoO3F3 has been refined by Rietveld method at T = 298 K (space group Fm-3m, a = 8.92446(8) Å, V = 710.76(1) Å3; RB = 3.55%). Ferroelectric G1-Rb2KMoO3F3 polymorph, earlier reported at T˂328 K, is not found at T = 298 K.

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Держатели документа:
[Atuchin, V. V.] SB RAS, Inst Semicond Phys, Lab Opt Mat & Struct, Novosibirsk 630090 90, Russia
[Gavrilova, T. A.] SB RAS, Inst Semicond Phys, Lab Nanolithog & Nanodiagnost, Novosibirsk 630090 90, Russia
[Isaenko, L. I.
Zhurkov, S. A.] SB RAS, Inst Geol & Mineral, Lab Crystal Growth, Novosibirsk 530090 90, Russia
[Kesler, V. G.] SB RAS, Inst Semicond Phys, Lab Phys Principles Integrated Microelect, Novosibirsk 630090 90, Russia
[Molokeev, M. S.] SB RAS, Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036 36, Russia

Доп.точки доступа:
Atuchin, V. V.; Gavrilova, T. A.; Isaenko, L. I.; Kesler, V. G.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhurkov, S. A.
}
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Studies of ferroelectric and magnetic phase transitions in multiferroic PbFe0.5B0.5O3-PbTiO3 (B-Nb, Ta) solid solution ceramics / I. P. Raevski [et al.] // International symposium "Physics and Mechanics of New Materials and Underwater Applications" : Abstracts and schedule. - 2013. - P. 38-39

Доп.точки доступа:
Raevski, I. P.; Kubrin, S. P.; Blazhevich, A. V.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Misjul, S. V.; Eremin, E. V.; Еремин, Евгений Владимирович; Chen, H.; Sitalo, E. I.; Raevskaya, S. I.; Titov, V. V.; Sarychev, D. A.; Malitskaya, M. A.; Zakharchenko, I. N.; "Physics and Mechanics of New Materials and Underwater Applications", International symposium (2013 ; Jun. ; 5-8 ; Kaohsiung, Taiwan)
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Magnetic nanoparticles formed in glasses co-doped with iron and larger radius elements / I. S. Edelman [et al.] // J. Appl. Phys. - 2012. - Vol. 112, Is. 8. - Ст. 84331. - P. , DOI 10.1063/1.4759244. - Cited References: 65. - This work was partly supported by the Russian Foundation for Basic Research, Grant Nos. 07-02-92174 RFBR-CNRS and 11-02-00972, and President of Russia Federation Grant No NSh 1044.2012.2. A. Artemenko acknowledges financial support from the Marie Curie International Incoming Fellowship within the 7th European Community Framework Programme (EPREXINA, GA 255662). The synchrotron measurements were supported via the Russian federal Contract No. 16.552.11.7003. The authors thank K. P. Polyakova for the preparation of thin films. . - ISSN 0021-8979

РУБ Physics, Applied
Рубрики:
SUPERPARAMAGNETIC RESONANCE
   FERROMAGNETIC-RESONANCE
   TEMPERATURE-DEPENDENCE
   FERRITE NANOPARTICLES
   OXIDE NANOPARTICLES
   FARADAY-ROTATION
   CERAMICS
   ANISOTROPY
   PARTICLES
   SPECTRA
Аннотация: A new type of nanoparticle-containing glasses based on borate glasses co-doped with low contents of iron and larger radius elements, Dy, Tb, Gd, Ho, Er, Y, and Bi, is studied. Heat treatment of these glasses results in formation of magnetic nanoparticles, radically changing their physical properties. Transmission electron microscopy and synchrotron radiation-based techniques: x-ray diffraction, extended x-ray absorption fine structure, x-ray absorption near-edge structure, and small-angle x-ray scattering, show a broad distribution of nanoparticle sizes with characteristics depending on the treatment regime; a crystalline structure of these nanoparticles is detected in heat treated samples. Magnetic circular dichroism (MCD) studies of samples subjected to heat treatment as well as of maghemite, magnetite, and iron garnet allow to unambiguously assign the nanoparticle structure to maghemite, independently of co-dopant nature and of heat treatment regime used. Different features observed in the MCD spectra are related to different electron transitions in Fe3+ ions gathered in the nanoparticles. The static magnetization in heat treated samples has non-linear dependence on the magnetizing field with hysteresis. Zero-field cooled magnetization curves show that at higher temperatures the nanoparticles occur in superparamagnetic state with blocking temperatures above 100 K. Below ca. 20 K, a considerable contribution to both zero field-cooled and field-cooled magnetizations occurs from diluted paramagnetic ions. Variable-temperature electron magnetic resonance (EMR) studies unambiguously show that in as-prepared glasses paramagnetic ions are in diluted state and confirm the formation of magnetic nanoparticles already at earlier stages of heat treatment. Computer simulations of the EMR spectra corroborate the broad distribution of nanoparticle sizes found by "direct" techniques as well as superparamagnetic nanoparticle behaviour demonstrated in the magnetization studies. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4759244]

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Держатели документа:
[Edelman, I.
Ivanova, O.
Ivantsov, R.
Velikanov, D.
Zabluda, V.] LV Kirensky Inst Phys SB RAS, Krasnoyarsk 660036, Russia
[Zubavichus, Y.
Veligzhanin, A.] NRC Kurchatov Inst, Moscow 123182, Russia
[Zaikovskiy, V.] Siberian Branch RAS, Boreskov Inst Catalysis, Novosibirsk 630090, Russia
[Stepanov, S.] SI Vavilov State Opt Inst, St Petersburg, Russia
[Artemenko, A.] CNRS, ICMCB, UPR 9048, F-33608 Pessac, France
[Curely, J.
Kliava, J.] Univ Bordeaux 1, CNRS, UMR 5798, LOMA, F-33405 Talence, France

Доп.точки доступа:
Edelman, I. S.; Эдельман, Ирина Самсоновна; Ivanova, O. S.; Иванова, Оксана Станиславовна; Ivantsov, R. D.; Иванцов, Руслан Дмитриевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Zabluda, V. N.; Заблуда, Владимир Николаевич; Zubavichus, Y.; Veligzhanin, A. A.; Zaikovskiy, V. I.; Stepanov, S.; Artemenko, A.; Curely, J.; Kliava, J.
}
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Исследование теплового расширения и теплоемкости керамики CaCu[[d]]3[[/d]]Ti4O[[d]]12[[/d]] / М. В. Горев [и др.] // Физ. тверд. тела. - 2012. - Т. 54, Вып. 9. - С. 1675-1679 . - ISSN 0367-3294
Аннотация: Выполнены измерения теплового расширения керамики CaCu3Ti4O12 в широком интервале температур 120-1200 K. Качество исследованных образцов подтверждается хорошим согласием результатов измерений теплоемкости в интервале 2-300 K и в окрестности фазового перехода магнитной природы при 25 K с данными для монокристалла. Аномалий в тепловом расширении, которые могли бы быть связаны с предполагавшимся другими исследователями фазовым переходом при 726-732 K, обнаружено не было. Исследовано влияние на тепловое расширение термической обработки образца в атмосфере гелия и на воздухе. Работа выполнена при поддержке гранта президента РФ по поддержке ведущих научных школ РФ (НШ-4828.2012.2).

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Переводная версия Investigation of the thermal expansion and heat capacity of the CaCu[[d]]3[[/d]]Ti[[d]]4[[/d]]O[[d]]12[[/d]] ceramics. - [Б. м. : б. и.]

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

Доп.точки доступа:
Горев, Михаил Васильевич; Gorev M.V.; Флёров, Игорь Николаевич; Flerov, I. N.; Карташев, Андрей Васильевич; Kartashev A.V.; Guillemet-Fritsch, S.
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Investigation of the thermal expansion and heat capacity of the CaCu[[d]]3[[/d]]Ti[[d]]4[[/d]]O[[d]]12[[/d]] ceramics / M. V. Gorev [et al.] // Phys. Solid State. - 2012. - Vol. 54, Is. 9. - P. 1785-1789, DOI 10.1134/S1063783412090120. - Cited References: 22. - This study was supported by the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools of the Russian Federation (grant no. NSh-4828.2012.2). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
GIANT DIELECTRIC-CONSTANT
HIGH-TEMPERATURES
Аннотация: The thermal expansion of the CaCu3Ti4O12 ceramics has been measured over a wide temperature range 120–1200 K. The high quality of the samples under study has been confirmed by good agreement of the results of measurements of the heat capacity in the range 2–300 K and in the vicinity of the phase transition of magnetic nature at 25 K with the data for the single crystal. No anomalies in the thermal expansion that can be associated with the phase transition at 726–732 K assumed by other investigators have been found. The influence exerted on the thermal expansion by the heat treatment of the sample in a helium atmosphere and in air has been investigated.

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Публикация на русском языке Исследование теплового расширения и теплоемкости керамики CaCu[[d]]3[[/d]]Ti4O[[d]]12[[/d]] // Физика твердого тела : Физико-технический институт им. А.Ф.Иоффе РАН, 2012. - Т. 54, Вып. 9. - С. 1675-1679. - ISSN 0367-3294

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Kartashev, A. V.; Карташев, Андрей Васильевич; Guillemet-Fritsch, S.
}
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Studies of ferroelectric and magnetic phase transitions in multiferroic PbFe0.5Ta0.5O3-PbTiO3 solid solution ceramics / I. P. Raevski [et al.] // J. Mater. Sci. - 2014. - Vol. 49, Is. 18. - P. 6459-6466, DOI 10.1007/s10853-014-8376-z. - Cited References: 35. - This study is partially supported by the Russian Foundation for Basic Research (RFBR) Project 12-08-00887_a and Research Committee of the University of Macau under Research and Development Grant for Chair Professor. . - ISSN 0022-2461. - ISSN 1573-4803

РУБ Materials Science, Multidisciplinary
Рубрики:
MOSSBAUER
   CRYSTALS
   BEHAVIOR
   NIOBATE
Аннотация: Dielectric, X-ray, Mossbauer and magnetization studies of (1 − x)PbFe0.5Ta0.5O3–(x)PbTiO3 ceramics with 0 ≤ x ≤ 0.3 have been carried out to determine the compositional evolution of ferroelectric and magnetic phase transition temperatures. Addition of PbTiO3 to PbFe0.5Ta0.5O3 increases the temperature T m of the dielectric permittivity maximum, decreases both the diffusion of this maximum and its frequency dependence. However, the Curie–Weiss temperature exceeds T m for all the compositions studied, indicating that the phase transition still remains diffused. Dilution of the (Fe, Ta)-sublattice by Ti lowers the Neel temperature T N but above a certain compositional threshold (x ≈ 0.1) fast lowering of T N stops and a new magnetic state stable in a rather wide compositional range appears. Large difference between the zero-field-cooled (ZFC) and FC magnetization–temperature curves as well as between the temperatures of magnetic phase transition determined from Mossbauer and magnetization studies for compositions with x 0.1 implies that this state is a spin-glass phase.

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Держатели документа:
Southern Fed Univ, Fac Phys, Rostov Na Donu 344090, Russia
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
Univ Macau, Fac Sci & Technol, Taipa, Peoples R China
Natl Taiwan Univ Sci & Technol, Taipei 106, Taiwan

Доп.точки доступа:
Raevski, I. P.; Titov, V. V.; Malitskaya, M. A.; Eremin, E. V.; Еремин, Евгений Владимирович; Kubrin, S. P.; Blazhevich, A. V.; Chen, H.; Chou, C.-C.; Raevskaya, S. I.; Zakharchenko, I. N.; Sarychev, D. A.; Shevtsova, S. I.; Russian Foundation for Basic Research (RFBR) [12-08-00887_a]; Research Committee of the University of Macau
}
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Synthesis and luminescence properties of Li2O–Y2O3–TeO2:Eu3+ tellurite glass / V. V. Atuchin [et al.] // Mater. Chem. Phys. - 2014. - Vol. 147, Is. 3. - P. 1191-1194, DOI 10.1016/j.matchemphys.2014.07.003. - Cited References: 26. - This study is partly supported by the Ministry of Education and Science of the Russian Federation. . - ISSN 0254-0584. - ISSN 1879-3312

РУБ Materials Science, Multidisciplinary
Рубрики:
LIGHT-EMITTING-DIODES
   SPECTROSCOPIC PROPERTIES
   OPTICAL-PROPERTIES
   ENERGY-TRANSFER
   CERAMICS
   Eu3+
   PHOTOLUMINESCENCE
   TEMPERATURE
   EMISSION
   PHOSPHOR
Кл.слова (ненормированные):
Glasses -- Heat treatment -- Photoluminescence spectroscopy -- Optical properties
Аннотация: The Eu3+-doped red-orange emitting phosphor of tellurite glass 0.25Li2O–0.20Y2O3–0.5TeO2–0.05Eu2O3 has been synthesized by the melt quenching method. The amorphous nature of the glass has been verified by XRD measurements. The photoluminescence excitation and emission spectra, the luminescence decay curves have been investigated for the composition. The phosphor can be efficiently excited by the near UV light to realize the intense narrow red emission line (611 nm) corresponding to forced electric dipole transition 5D0 → 7F2 of Eu3+ ions. The Li2O–Y2O3–TeO2:Eu3+glass phosphor is a potential red-orange emitting candidate for the application in WLEDs.

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Держатели документа:
SB RAS, Inst Semicond Phys, Lab Opt Mat & Struct, Novosibirsk 630090, Russia
Tomsk State Univ, Funct Elect Lab, Tomsk 634050, Russia
Novosibirsk State Univ, Lab Semicond & Dielect Mat, Novosibirsk 630090, Russia
SB RAS, Inst Geol & Mineral, Lab High Pressure Minerals & Diamond Deposits, Novosibirsk 630090, Russia
Novosibirsk State Univ, Dept Appl Phys, Novosibirsk 630090, Russia
SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Atuchin, V. V.; Yelisseyev, A. P.; Galashov, E. N.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Ministry of Education and Science of the Russian Federation
}
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10.

Magnetic nanoparticles in borate glasses: Identification and sizing / I. S. Edelman [et al.] // International Conference on Optimization of Electrical and Electronic Equipment (OPTIM 2014) : IEEE Computer Society, 2014. - P. 95-104, DOI 10.1109/OPTIM.2014.6850939. - Cited References: 60 . - ISBN 978-1-4799-5183-3
Рубрики:
Engineering, Electrical and Electronic
Кл.слова (ненормированные):
SUPERPARAMAGNETIC RESONANCE -- FERROMAGNETIC-RESONANCE -- FERRITE NANOPARTICLES -- OXIDE NANOPARTICLES -- FARADAY-ROTATION -- CERAMICS -- IRON -- CRYSTALLIZATION -- ANISOTROPY -- PARTICLES
Аннотация: Heat treatment of borate glasses co-doped with low contents of iron and larger radius elements: Dy, Tb, Gd, Ho, Er, Y and Bi results in formation of magnetic nanoparticles, radically changing their physical properties. Transmission electron microscopy and synchrotron radiation-based techniques: XRD, EXAFS, XANES and SAXS, show a broad distribution of nanoparticle sizes with characteristic depending on the treatment regime; a crystalline structure of these nanoparticles is detected in heat treated samples. Magnetic circular dichroism (MCD) studies of samples subjected to heat treatment as well as of maghemite, magnetite and iron garnet allow to unambiguously assigning the nanoparticle structure to maghemite. Different features observed in the MCD spectra are related to different electron transitions in Fe3+ ions gathered in the nanoparticles. Variable-temperature electron magnetic resonance (EMR) studies confirm the formation of magnetic nanoparticles and the identification of their nature. Computer simulations of the EMR spectra corroborate the broad distribution of nanoparticle sizes found by 'direct' techniques. © 2014 IEEE.

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Доп.точки доступа:
Edelman, I. S.; Эдельман, Ирина Самсоновна; Ivanova, O. S.; Иванова, Оксана Станиславовна; Zubavichus, Y.; Trofimova, N. N.; Zaikovskiy, V. I.; Artemenko, A.; Curely, J.; Kliava, J.; Russian Foundation for Basic Research; Russian Foundation for Basic Research; International Conference on Optimization of Electrical and Electronic Equipmen (22 May - 24 May 2014 ; Bran, Romania)
}
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