HEAT-CAPACITY AND THERMODYNAMIC PROPERTIES OF DEUTERATED AMMONIUM HEXAFLUOROPHOSPHATE ND4PF6 FROM 5.8-K TO 347-K

被引：9

作者：

CALLANAN, JE

WEIR, RD

WESTRUM, EF

机构：

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

[2] NATL INST STAND & TECHNOL,CTR CHEM TECHNOL,BOULDER,CO 80303

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

来源：

JOURNAL OF CHEMICAL THERMODYNAMICS | 1990年 / 22卷 / 10期

关键词：

D O I：

10.1016/0021-9614(90)90187-U

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The heat capacity of deuterated ammonium hexafluorophosphate ND4PF6 was measured from 5.8 K to 347 K by adiabatic calorimetry. Two λ-shaped anomalies were found in the curve for heat capacity against temperature. The upper anomaly reached a peak Cp,m ≈ 600·R at (194.4 ± 0.05) K with ΔtrsSmo = (1.013 ± 0.016)·R (R = 8.3145J·K-1·mol-1). The lower anomaly is also λ-shaped but is gradual, continuous, and reaches its maximum Cp,m = 19.2·R at (137.5 ± 1.0) K with ΔtrsSmo = (0.562 ± 0.011)·R. Both anomalies are characteristic of order-disorder transitions. Smoothed values of the standard thermodynamic quantities are tabulated up to 350 K. © 1990.

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页码：979 / 990

页数：12

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