Thermodynamic investigation of the Ruddlesden-Popper phase Sr3Fe2O7

被引：4

作者：

Knyazev, A. V. ^{[1
]}

Alekseeva, Yu. V. ^{[1
]}

Smirnova, N. N. ^{[1
]}

Krasheninnikova, O. V. ^{[1
]}

Markin, A. V. ^{[1
]}

Syrov, E. V. ^{[1
]}

Elipasheva, E. V. ^{[1
]}

Smirnova, L. V. ^{[1
]}

机构：

[1] Lobachevsky Univ, Gagarin Prospekt 23-2, Nizhnii Novgorod 603950, Russia

来源：

JOURNAL OF CHEMICAL THERMODYNAMICS | 2020年 / 143卷 / 143期

关键词：

Layered perovskite; Ruddlesden-Popper phase; Adiabatic vacuum calorimetry; Heat capacity; Phase transition; Thermodynamic functions; TEMPERATURE HEAT-CAPACITY; CHARGE DISPROPORTIONATION; MAGNETIC-PROPERTIES; OXYGEN DIFFUSION; OXIDE; DIFFRACTION; SYSTEM;

D O I：

10.1016/j.jct.2020.106061

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The heat capacity of layered perovskite-like oxide Sr3Fe2O7 was measured for the first time by precision adiabatic vacuum calorimetry over the temperature range of (6-305) K and by differential scanning calorimetry in the range from 300 K to 420 K. The standard thermodynamic functions of the compound were evaluated from the experimental heat capacity temperature dependences over the range of (0-420) K. The phase transitions of the compound were studied by means of X-ray diffraction and differential scanning calorimetry. The main regularities of the thermal expansion of Sr3Fe2O7 are revealed. The mechanisms of the phase transitions at 120 K and 366 K are suggested. More significant structural changes were observed for metal-insulator transition. All transformations occur within the tetragonal symmetry of the unit cell. (C) 2020 Elsevier Ltd.

引用

页数：6

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