High-Temperature Heat Capacity and Thermodynamic Functions of the LiNaGe4O9 Germanate

被引：0

作者：

Denisova, L. T. ^{[1
]}

Golubeva, E. O. ^{[1
]}

Kargin, Yu. F. ^{[2
]}

Vasil'ev, G. V. ^{[1
]}

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

机构：

[1] Siberian Fed Univ, Krasnoyarsk 660041, Russia

[2] Russian Acad Sci, Baikov Inst Met & Mat Sci, Moscow 119991, Russia

来源：

INORGANIC MATERIALS | 2023年 / 59卷 / 07期

关键词：

lithium sodium tetragermanate; solid-state synthesis; heat capacity; thermodynamic functions; ANOMALIES; ALKALI; SOLIDS; MN4+;

D O I：

10.1134/S0020168523070026

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Lithium sodium tetragermanate, LiNaGe4O9, has been prepared by solid-state reaction, by sequentially firing stoichiometric mixtures of Li2CO3, Na2CO3, and GeO2 starting materials in air in the temperature range 773-1073 K. Its unit-cell parameters have been determined by X-ray diffraction: a = 4.68007(3) angstrom, b = 9.3220(8) angstrom, c = 15.900(2) angstrom, and V = 694.113 angstrom (Z = 4, sp. gr. Pcca). The high-temperature heat capacity of the germanate has been determined using differential scanning calorimetry in the temperature range 320-1050 K. The experimental temperature-dependent heat capacity data, C-p(T), have been used to calculate the principal thermodynamic functions of LiNaGe4O9.

引用

页码：777 / 781

页数：5

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