Thermodynamic properties of ammonium haloplatinates

The heat capacity of deuterated ammonium hexachloroplatinate (ND 4) 2PtCl 6 was measured at temperatures from 5 K to 350 K by adiabatic calorimetry. One λ-shaped anomaly, absent in the undeuterated salt, was found in the curve for heat capacity against temperature. This λ-shaped transition reaches i...

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Bibliographic Details
Published in:The Journal of chemical thermodynamics 1991-07, Vol.23 (7), p.653-665
Main Authors: Weir, Ron D., Westrum, Jr, Edgar F.
Format: Article
Language:English
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Summary:The heat capacity of deuterated ammonium hexachloroplatinate (ND 4) 2PtCl 6 was measured at temperatures from 5 K to 350 K by adiabatic calorimetry. One λ-shaped anomaly, absent in the undeuterated salt, was found in the curve for heat capacity against temperature. This λ-shaped transition reaches its maximum C p,m ≈ 59.3· R at (27.2±0.05) K with Δ trs S o m = (1.216±0.004)· R, characteristic of an order-disorder transition. Smoothed values of the standard thermodynamic quantities for pure (ND 4) 2PtCl 6 are tabulated at temperatures up to 350 K.
ISSN:0021-9614
1096-3626
DOI:10.1016/S0021-9614(05)80203-4