THERMODYNAMICS OF AMMONIUM HALOPALLIDATES .2. HEAT-CAPACITY AND THERMODYNAMIC PROPERTIES OF (ND4)2PDCL6 AT TEMPERATURES FROM 5-K TO 325-K

被引：27
作者：
CALLANAN, JE
WEIR, RD
WESTRUM, EF
机构：
[1] ROYAL MIL COLL CANADA,DEPT CHEM & CHEM ENGN,KINGSTON K7K 5LO,ON,CANADA
[2] UNIV MICHIGAN,DEPT CHEM,ANN ARBOR,MI 48109
来源：
BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 1992年 / 96卷 / 11期
关键词：
ADIABATIC CALORIMETRY; HEAT CAPACITY; PHASE TRANSITIONS; THERMODYNAMICS;
D O I：
10.1002/bbpc.19920961113
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 heat capacity of deuterated ammonium hexachloropallidate (ND4)2PdCl6 was measured from 5 K to 325 K by adiabatic calorimetry. One lambda-shaped phase transition, absent in the protonated salt, was found in the curve for heat capacity against temperature. This transition reaches its maximum C(p,m) congruent-to 150 . R at (30.2 +/- 0.1) K with DELTA(trs)S(M)o = (2.005 +/- 0.009) . R (R = 8.31451 J . K-1 . mol-1) and marks the change from the high temperature cubic structure to the low temperature tetragonal structure. The Debye temperature at 0 K equals (96.5 +/- 2.4) K and below 10 K, only lattice vibrations make significant contributions to the heat capacity. Smoothed values of the standard thermodynamic quantities for pure (ND4)2PdCl6 are tabulated up to 320 K and the S(m)o(273.15 K) = (49.80 +/- 0.05) . R.
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页码：1585 / 1591
页数：7
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