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    Bogdanov, E. V.
    Calorimetric study of the fluoro-oxygen crystal (ND4)2MoO2F4 / E. V. Bogdanov, E. I. Pogoreltsev // Proc. of int. conf. on therm. analys. and calorim. in Russia (RTAC-2016). - 2016. - Vol. I. - P. 181 . - ISBN 978-5-7422-5447-8
   Перевод заглавия: Калориметрические исследования фтор-кислородного кристалла (ND4)2MoO2F4

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Доп.точки доступа:
Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Богданов, Евгений Витальевич; International conference on thermal analysis and calorimetry in Russia(2016 ; Sept. ; 16-23 ; Saint-Petersburg); Международная конференция по термическому анализу и калориметрии в России(15 ; 16 - 23 сентября 2016 г. ; г. Санкт-Петербург); Институт общей и неорганической химии им. Н.С. Курнакова РАНСанкт-Петербургский политехнический университет им. Петра Великого
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Ferroelastic phase transition in Cs3Bi2I9 crystal / S. V. Melnikova [et al.] // Ferroelectrics, Letters Section. - 1996. - Vol. 20, Is. 5-6. - P. 163-167 . - ISSN 0731-5171
Кл.слова (ненормированные):
Birefringence -- Cesium compounds -- Crystal symmetry -- Crystals -- Differential scanning calorimetry -- Elasticity -- Ferroelectricity -- Permittivity -- Stiffness -- Twinning -- Cesium bismuth iodide -- Elastic constant -- Elastic stiffness -- Ferroelastic phase transition -- Phase transitions
Аннотация: Phase transition (PT) was found in Cs3Bi2I9 single crystal at T0=223 K. Optical birefringence, dielectric and elastic constants and differential scanning calorimetry have been studied. It was found that birefringence ?nc and twinning picture appeared on (001) - and (100) - plates below T0, as well as softening of elastic stiffness C44 above T0. It allows to classify the PT as proper ferroelastic one with symmetry change 6/mmm - 2/m. В© 1996 OPA (Overseas Publishers Association) Amsterdam B.V. Published in The Netherlands under license by Gordon and Breach Science Publishers SA.

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Доп.точки доступа:
Melnikova, S. V.; Мельникова, Светлана Владимировна; Shabanova, L. A.; Zaitsev, A. I.; Зайцев, Александр Иванович; Parshikov, S. A.; Ageev, O. A.; Aleksandrov, K. S.; Александров, Кирилл Сергеевич
}
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Flerov, I. N.
Conversial and inversial barocaloric effects around triple points in ferroelastics (NH4)3NbOF6 and (NH4)3TiOF5 / I. N. Flerov, M. V. Gorev, E. V. Bogdanov // 2nd Journale of Thermal analysis and calorimetry conference : book of abstracts. - 2019. - P. 489-490. - Cited References:. - The reported study was funded by RFBR according to the research project No 18-02-00269 . - ISBN 978-963-454-416-6

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk
Institute of Engineering Systems and Energy, Krasnoyarsk State Agrarian University, Krasnoyarsk

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Флёров, Игорь Николаевич; Journale of Thermal Analysis and Calorimetry Conference(2 ; 2019 ; June. ; 18-21 ; Budapest, Hungary); Joint Czech-Hungarian-Polish-Slovakian) Thermoanalytical Conference(7 ; 2019 ; June. ; 18-21 ; Budapest, Hungary)
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Heat capacity and structure of Rb2KMeO3F3 (Me: Mo, W) elpasolites / A. V. Kartashev [et al.] // Solid State Sci. - 2012. - Vol. 14, Is. 1. - P. 166-170, DOI 10.1016/j.solidstatesciences.2011.11.019. - Cited References: 12. - This study was supported by the Siberian Branch of the Russian Academy of Sciences (Grant no. 34) and the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation (NSh-4645.2010.2). . - ISSN 1293-2558

РУБ Chemistry + Physics
Рубрики:
T PHASE-DIAGRAM
Rb2KMoO3F3
TRANSITION
Кл.слова (ненормированные):
Oxyfluorides -- Crystal structure -- Phase transition -- Calorimetry
Аннотация: X-ray and heat capacity measurements were performed on Rb2KMoO3F3 and Rb2KWO3F3 single crystals. A significant difference in the thermal parameters of atoms in 4a and 8c sites of Fm-3m structure was found, which depended on the central atom. Calorimetric measurements have revealed the heat capacity anomalies at 195 and 67 K, respectively, in Rb2KMoO3F3 and Rb2KWO3F3. The standard molar enthalpy and entropy were determined. Entropy changes associated with phase transitions in oxyfluorides under study and related Rb2KTiOF5 are discussed. 2011 Elsevier Masson SAS. All rights reserved.

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Держатели документа:
[Gorev, Michail V.] Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Kartashev, Andrey V.
Gorev, Michail V.
Flerov, Igor N.] Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660074, Russia
[Isaenko, Lyudmila I.
Zhurkov, Sergey A.] Russian Acad Sci, Inst Geol & Mineral, Novosibirsk 630090, Russia

Доп.точки доступа:
Kartashev, A. V.; Карташев, Андрей Васильевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Isaenko, L. I.; Zhurkov, S. A.; Fokina, V. D.; Фокина, Валентина Дмитриевна; Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Siberian Branch of the Russian Academy of Sciences [34]; Russian Federation for the Support of Leading Scientific Schools of the Russian Federation [NSh-4645.2010.2]
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Heat capacity and thermal expansion study of relaxor-ferroelectric Ba0.92Ca0.08Ti0.76Zr0.24O3 / M. . Gorev [et al.] // J. Phys.: Condens. Matter. - 2004. - Vol. 16, Is. 39. - P. 7143-7150, DOI 10.1088/0953-8984/16/39/045. - Cited References: 18 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
CERAMICS
BA(TI1-XZRX)O-3
PEROVSKITES
Кл.слова (ненормированные):
Calorimetry -- Dielectric properties -- Ferroelectric materials -- Perovskite -- Phase transitions -- Solid solutions -- Specific heat -- Thermal expansion -- Adiabatic calorimetry -- Frequency dispersion -- Polar domains -- Relaxor ferroelectrics -- Barium compounds
Аннотация: Heat capacity and thermal expansion of the Ba0.92Ca0.08Ti0.76Zr0.24O3 compound is measured using the methods of adiabatic calorimetry and optic-mechanical dilatometry in the temperature range 100-370 K. Three blurred anomalies on the C-p(T) and alpha(T) dependencies are observed in the temperature range 200-360 K. The results of the studies are discussed together with data on the structure and dielectric properties in the framework of spherical random bond-random field model.

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Держатели документа:
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

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Sciau, P.; Savariault, J. M.
}
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Heat capacity and thermodynamic properties of germanates CaR2Ge3O10 (R = Pr, Nd) in the region of 320–1000 K / L. T. Denisova, M. S. Molokeev, N. A. Galiakhmetova [et al.] // Russ. J. Phys. Chem. A. - 2022. - Vol. 96, Is. 5. - P. 913-917, DOI 10.1134/S0036024422050077. - Cited References: 30. - The authors are grateful to the Krasnoyarsk Regional Shared Resource Center of the Krasnoyarsk Science Center. This work was performed as part of a State Task for Siberian Federal University, project no. FSRZ-2020-0013 . - ISSN 0036-0244
Кл.слова (ненормированные):
neodymium and praseodymium calcium germanates -- differential scanning calorimetry -- high-temperature heat capacity
Аннотация: Sequential annealing of stoichiometric mixtures of CaCO3, Pr6O11(Nd2O3), and GeO2 in air at 1423–1473 K yields germanates CaPr2Ge3O10 and CaNd2Ge3O10. Their crystal structure is refined via X-ray diffraction. The high-temperature heat capacity (320–1000 K) is measured by means of differential scanning calorimetry. The thermodynamic properties of germanates are calculated using experimental dependences Cp = f(T).

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Публикация на русском языке Теплоемкость и термодинамические свойства германатов CaR2Ge3O10 (R = Pr, Nd) в области 320–1000 K [Текст] / Л. Т. Денисова, М. С. Молокеев, Н. А. Галиахметова [и др.] // Журн. физ. химии. - 2022. - Т. 96 № 5. - С. 615-620

Держатели документа:
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Denisova, L. T.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Galiakhmetova, N. A.; Denisov, V. M.; Belousova, N. V.
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Heat capacity study of relaxor PbMg1/3Nb2/3O3 in a wide temperature range / M. V. Gorev [et al.] // J. Exp. Theor. Phys. - 2003. - Vol. 96, Is. 3. - P. 531-537, DOI 10.1134/1.1567427. - Cited References: 21 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
DIFFUSE PHASE-TRANSITION
FERROELECTRICS
Кл.слова (ненормированные):
Differential scanning calorimetry -- Mathematical models -- Phonons -- Random processes -- Specific heat -- Spectrum analysis -- Thermal effects -- Bond-random field models -- Wide temperature intervals -- Lead compounds
Аннотация: Heat capacity of the PbMg1/3Nb2/3O3 compound is measured using the methods of adiabatic and differential scanning calorimetry in the temperature range 80-750 K. Two blurred anomalies on the C-p(T) dependence are observed in wide temperature intervals of 200- 400 K and 500-700 K. The results of studies are discussed together with data on the structure and phonon spectrum in the framework of spherical random bond-random field model. (C) 2003 MAIK "Nauka/Interperiodica".

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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. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Sciau, P.
}
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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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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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10.

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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