Heat Capacity and Thermodynamic Functions of Neodymium Orthoniobate

被引：3
|
作者：
Nikiforova, G. E. [1 ]
Kondrat'eva, O. N. [1 ]
Tyurin, A. V. [1 ]
Ryumin, M. A. [1 ]
Khoroshilov, A. V. [1 ]
Gavrichev, K. S. [1 ]
机构：
[1] Russian Acad Sci, Kurnakov Inst Gen & Inorgan Chem, Moscow 119991, Russia
来源：
RUSSIAN JOURNAL OF INORGANIC CHEMISTRY | 2021年 / 66卷 / 02期
基金：
俄罗斯基础研究基金会;
关键词：
NdNbO4; calorimetry; phase transition; SCHEELITE PHASE-TRANSITION; MICROWAVE DIELECTRIC-PROPERTIES; EARTH ORTHO-NIOBATES; NEUTRON-DIFFRACTION; NDNBO4; FERGUSONITE; GDNBO4;
D O I：
10.1134/S0036023621020145
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The heat capacity of polycrystalline neodymium orthoniobate NdNbO4 in the range 2-1370 K is studied by relaxation, adiabatic, and differential scanning calorimetry. The existence of a magnetic transformation with a Neel temperature below 2 K in the low-temperature region is verified. The reversible phase transition at 987 K is shown to be a second-order transition. The contribution of the Schottky anomaly (Schottky contribution) to neodymium orthoniobate heat capacity is estimated. The gained data are used to calculate temperature-dependent standard thermodynamic functions in the range from 0 to 1400 K. Their values at 298.15 K are C-p degrees(298.15 K) = 121.4 +/- 0.4 J/(K mol), S degrees(298.15 K) = 134.7 +/- 0.5 J/(K mol), H degrees(298.15 K) - H degrees(0 K) = 21.24 +/- 0.17 kJ/mol, R EF degrees(298.15 K) = 63.43 +/- 0.21 J/(K mol).
引用
收藏
页码：237 / 244
页数：8
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