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Thermodynamics of ammonium haloplatinates V. Heat capacity, phase transitions and thermodynamic properties of(ND4)2PtBr6fromT =  5 K toT =  350 K

✍ Scribed by Jane E. Callanan; ; Ron D. Weir; Edgar F. Westrum; Jr

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
464 KB
Volume
32
Category
Article
ISSN
0021-9614

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✦ Synopsis

The heat capacity C p,m of deuterated ammonium hexabromoplatinate, (ND 4 ) 2 PtBr 6 , was measured from T = 5 K to T = 350 K by adiabatic calorimetry. One Ξ»-shaped anomaly was found in the curve for heat capacity against temperature. This Ξ»-shaped transition reaches its maximum C p,m = 71.5 β€’ R at T = (68.0 Β± 0.1) K, with trs S o m = (2.684 Β± 0.028) β€’ R characteristic of an order-disorder transition. The resulting standard molar entropy is found to be: T 0 S o m {(ND 4 ) 2 PtBr 6 , cr}/R = (59.92 Β± 0.09), where T = 298.15 K and R = 8.35451 J β€’ K -1

β€’ mol -1 . On the basis of this result, the free energy function is o m {(ND 4 ) 2 PtBr 6 , cr}/R = (34.54 Β± 0.05). Smoothed values of the standard thermodynamic quantities for pure (ND 4 ) 2 PtBr 6 are tabulated at temperatures up to 350 K.

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