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Heat capacity and thermodynamic properties of GeSe2at temperatures fromT = ( 13 to 900) K. Structural phase transition atT =  423 K

✍ Scribed by S. Stølen; H.-B. Johnsen; R. Abe; T. Atake; T. Grande

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
150 KB
Volume
31
Category
Article
ISSN
0021-9614

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✦ Synopsis

The heat capacity of germanium diselenide GeSe 2 has been determined by adiabatic calorimetry at temperatures from (13 to 900) K. A phase transition not previously reported gives rise to a sharp λ-type heat capacity effect at T = 423 K. The overall estimated enthalpy of transition amounts to 1240 J•mol -1 at T = 600 K. The transition could not be detected by high-temperature powder X-ray diffraction. Values of the molar heat capacity, standard molar entropy, standard molar enthalpy, and standard molar Planck function of GeSe 2 at T = 298.15 and T = 900 K are:

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