The molar heat capacity of hydrous copper chloride: atacamite Cu2Cl(OH)3

The heat capacity of natural atacamite has been measured betweenT=2 K andT=305 K by cryogenic-adiabatic calorimetry. AtT=298.15 K, the standard molar heat capacityC°p,mand entropyS°mfor atacamite are (19.16±0.07)·R and (20.18±0.08)·R (where R=8.3144 J·K−1·mol−1), respectively. The heat capacity exib...

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Bibliographic Details
Published in:The Journal of chemical thermodynamics 1997-03, Vol.29 (3), p.345-352
Main Authors: Bisengalieva, Mira R., Kiseleva, Irina A., Melchakova, Lyubov V., Ogorodova, Lyubov P., Gurevich, Alla M.
Format: Article
Language:English
Subjects:
atacamite
calorimetry
heat capacity
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Summary:The heat capacity of natural atacamite has been measured betweenT=2 K andT=305 K by cryogenic-adiabatic calorimetry. AtT=298.15 K, the standard molar heat capacityC°p,mand entropyS°mfor atacamite are (19.16±0.07)·R and (20.18±0.08)·R (where R=8.3144 J·K−1·mol−1), respectively. The heat capacity exibits anomalous behaviour at temperatures lower than 10.5 K. Smoothed thermodynamic properties: molar heat capacity; molar entropy increment ΔT0S°m; and (Φ°m+ΔT0H°m/T), whereT=298.15 K, have been calculated. BetweenT=290 K andT=508 K the heat capacity of atacamite measured by d.s.c. is represented by the equation:C°p,m/R=18.80+8.11·10−3·(T/K)−1.87·10−5·(K/T)2.
ISSN:0021-9614
DOI:10.1006/jcht.1996.0162