High-temperature heat capacity and thermal expansion of the MnTa2O6

被引：13

作者：

Gulyaeva, R., I ^{[1
]}

Petrova, S. A. ^{[2
]}

Chumarev, V. M. ^{[1
]}

Selivanov, E. N. ^{[1
]}

机构：

[1] Russian Acad Sci, Lab Pyromet Nonferrous Met, Inst Met, Ural Branch, 101 Amundsen St, Ekaterinburg 620016, Russia

[2] Russian Acad Sci, Lab Phys Chem Met Melts, Inst Met, Ural Branch, 101 Amundsen St, Ekaterinburg 620016, Russia

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2020年 / 834卷

关键词：

Heat capacity; Thermal expansion; Manganese tantalate; CRYSTAL-STRUCTURE; DIELECTRIC-PROPERTIES; STABILIZED ZIRCONIA; MN; MNNB2O6; PHASES; COLUMBITES; REFINEMENT; ELECTRODE; ENTHALPY;

D O I：

10.1016/j.jallcom.2020.155153

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The sample of the MnTa2O6 manganese tantalate was synthesized from MnO and Ta2O5 mixture by the ceramic technique. According to XRD it was a single-phase sample with an orthorhombic structure (sp.gr. Pbcn) and unit cell parameters: a = 14.4478(2) angstrom; b = 5.7677(1) angstrom; c = 5.0943(1) angstrom; V = 424.52(1) angstrom(3) . Heat capacity was measured by differential scanning calorimetry in the range of 323-1203 K in a dynamic mode. Experimental molar heat capacity was fitted to C-p.m = 191.33 + 67.451 x 10(-3) T 32.71 x 10(5) T-2 - 18.76 x 10(-6) T-2 equation based on which the value of the C-p.m29(8.15)(MnTa2O6) = 173.0 +/- 1.7 J mol(-1)K(-1) was calculated. By HT-XRD thermal dependences of the MnTa2O6 unit cell parameters in the temperature range of 300-1203 K were established. From the data obtained thermal expansion coefficients and anisotropy factors were calculated. Thermal expansion anisotropy was linked to the layered structure of the oxide. The correlation among molar heat capacity values and volume thermal expansion coefficients were revealed. (C) 2020 Elsevier B.V. All rights reserved.

引用

页数：8

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