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
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.
引用
收藏
页码:661 / 672
页数:12
相关论文
共 50 条
[41]   THERMODYNAMIC PROPERTIES OF SILICIDES .2. HEAT-CAPACITY AT TEMPERATURES-T FROM 5.9-K TO 341-K AND DERIVED THERMODYNAMIC PROPERTIES TO T=1200-K OF TUNGSTEN DISILICIDE - W(SI)2.06 [J].
CALLANAN, JE ;
WEIR, RD ;
WESTRUM, EF .
JOURNAL OF CHEMICAL THERMODYNAMICS, 1993, 25 (11) :1391-1401
[42]   CESIUM DICHROMATE, CS-2CR-2O-7 - HEAT-CAPACITY AND THERMODYNAMIC PROPERTIES FROM 5 TO 350 K [J].
LYON, WG ;
OSBORNE, DW ;
FLOTOW, HE .
JOURNAL OF CHEMICAL THERMODYNAMICS, 1976, 8 (04) :373-380
[43]   THE THERMODYNAMICS OF AMMONIUM INDATES .1. THE HEAT-CAPACITY OF THE AMMONIUM PENTACHLOROINDATE MONOHYDRATE SALT (NH4)2INCL5.H2O FROM 8.5-K TO 349-K [J].
BROWN, RJC ;
CALLANAN, JE ;
WEIR, RD ;
WESTRUM, EF .
JOURNAL OF CHEMICAL THERMODYNAMICS, 1988, 20 (07) :847-853
[44]   THERMODYNAMIC PROPERTIES OF TUNGSTEN DITELLURIDE (WTE2) .1. THE PREPARATION AND LOW-TEMPERATURE HEAT-CAPACITY AT TEMPERATURES FROM 6-K TO 326-K [J].
CALLANAN, JE ;
HOPE, GA ;
WEIR, RD ;
WESTRUM, EF .
JOURNAL OF CHEMICAL THERMODYNAMICS, 1992, 24 (06) :627-638
[45]   HEAT-CAPACITY AND THERMODYNAMIC PROPERTIES OF CRSB2 FROM 5 TO 1050 K. MAGNETIC TRANSITION AND ENTHALPY OF DECOMPOSITION [J].
ALLES, A ;
FALK, B ;
WESTRUM, EF ;
GRONVOLD, F .
JOURNAL OF CHEMICAL THERMODYNAMICS, 1978, 10 (02) :103-116
[46]   THERMODYNAMICS OF COPPER SULFIDES .4. HEAT-CAPACITY AND THERMODYNAMIC PROPERTIES OF CU1.90S FROM 5-K TO 750-K, CU1.95S FROM 5-K TO 1000-K, CU1.98S FROM 300-K TO 1000-K, AND CU1.995S FROM 300-K TO 750-K [J].
STOLEN, S ;
GRONVOLD, F ;
WESTRUM, EF .
JOURNAL OF CHEMICAL THERMODYNAMICS, 1990, 22 (11) :1035-1057
[47]   THERMODYNAMICS OF THE LANTHANIDE TRIFLUORIDES .2. HEAT-CAPACITY OF PRASEODYMIUM TRIFLUORIDE PRF3 FROM 5-DEGREES-K TO 350-DEGREES-K [J].
LYON, WG ;
OSBORNE, DW ;
FLOTOW, HE .
JOURNAL OF CHEMICAL PHYSICS, 1979, 70 (02) :675-680
[48]   THE THERMODYNAMICS OF THE DIVALENT METAL FLUORIDES .2. HEAT-CAPACITY OF THE FAST ION CONDUCTOR BASNF4 FROM 7-K TO 345-K [J].
CALLANAN, JE ;
WEIR, RD ;
WESTRUM, EF .
INTERNATIONAL JOURNAL OF THERMOPHYSICS, 1988, 9 (06) :1091-1100
[49]   CESIUM DIURANATE (CS2U2O7) - HEAT-CAPACITY (5-K TO 350-K) AND THERMODYNAMIC FUNCTIONS TO 350-K - A RE-EVALUATION OF THE STANDARD ENTHALPY OF FORMATION AND THE THERMODYNAMICS OF (CESIUM+URANIUM+OXYGEN) [J].
OHARE, PAG ;
FLOTOW, HE ;
HOEKSTRA, HR .
JOURNAL OF CHEMICAL THERMODYNAMICS, 1981, 13 (11) :1075-1080
[50]   Heat capacity and thermodynamic properties of anisotropic crystals:: PbI2, ZnCl2, and AsI3 at temperatures from 5 K to 350 K [J].
Sipowska, JT ;
McBride, JJ ;
Westrum, EF .
JOURNAL OF CHEMICAL THERMODYNAMICS, 1998, 30 (11) :1333-1345