THERMODYNAMICS OF AMMONIUM HALOGENATED TELLURIDES .2. HEAT-CAPACITY, PHASE-TRANSITIONS, AND THERMODYNAMIC PROPERTIES OF (ND4)2TECL6 AT TEMPERATURES FROM 5-K TO 325-K

被引：13

作者：

CALLANAN, JE

WEIR, RD

WESTRUM, EF

机构：

[1] ROYAL MIL COLL CANADA,DEPT CHEM & CHEM ENGN,KINGSTON K7K 5L0,ONTARIO,CANADA

[2] CALLANAN ASSOCIATES,BOULDER,CO 80301

[3] UNIV MICHIGAN,DEPT CHEM,ANN ARBOR,MI 48109

来源：

JOURNAL OF CHEMICAL THERMODYNAMICS | 1992年 / 24卷 / 06期

关键词：

D O I：

10.1016/S0021-9614(05)80038-2

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The heat capacity of deuterated ammonium hexachlorotellurate (ND4)2TeCl6 was measured at temperatures T from 5 K to 325 K by adiabatic calorimetry. A small anomaly in the curve of heat capacity against temperature was found at T=(89.5±0.3)K with a maximum Cp,m = 23.84·R, ΔtrsS°m = (0.234±0.006)·R. The discovery of this anomaly supports the presence of a rotative displacive transition similar to that involving TeCl2- 6 in the undeuterated salt. In addition, two λ-shaped transitions were discovered at T = (31.4±0.1) K, with a maximum Cp,m = 34.7·R, ΔtrsS°m = (0.861±0.007) R, and at T = (47.6±0.1)K, with a maximum Cp,m = 18.6 R, ΔtrsS°m = (0.247±0.006) R. Smoothed values of the standard thermodynamic quantities for pure (ND4)2TeCl6 are tabulated up to T = 320 K. © 1992 Academic Press Limited All rights reserved.

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页码：661 / 672

页数：12

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