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Heat capacity, structural and thermodynamic properties of synthetic klockmannite CuSe at temperatures from 5 K to 652.7 K. Enthalpy of decomposition

✍ Scribed by Svein Stølen; Helmer Fjellvåg; Fredrik Grønvold; Jadwiga T. Sipowska; Edgar F. Westrum; Jr.

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
604 KB
Volume
28
Category
Article
ISSN
0021-9614

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✦ Synopsis

The heat capacity of CuSe has been determined by adiabatic shield calorimetry from T15 K to T=(652.720.1) K. At the upper temperature, CuSe disproportionates into Cu2-xSe and a liquid rich in Se. The low temperature hexagonal superstructure, which is based on the covellite-type structure, changes to an orthorhombic structure at T=(326.820.1) K. A transition back to hexagonal structure of the covellite-type occurs at T1410 K. The positions of the atoms in the two high-temperature modifications are determined by powder neutron and X-ray diffraction, and the temperature-induced changes in the atomic arrangements are discussed. The thermodynamic properties have been evaluated and the values of molar heat capacity, entropy, and enthalpy at T=298.15 K and T=652.

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