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K NUDSEN measurements of the sublimation and the Heat of Formation of GeSe
Author(s) -
Wiedemeier H.,
Irene E. A.
Publication year - 1974
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19744040311
Subject(s) - sublimation (psychology) , atmospheric temperature range , enthalpy of sublimation , materials science , analytical chemistry (journal) , crystallite , standard enthalpy of formation , enthalpy , thermodynamics , mass spectrometry , chemistry , metallurgy , organic chemistry , physics , psychology , chromatography , psychotherapist
K NUDSEN effusion studies of the sublimation of polycrystalline GeSe have been performed employing mass spectrometry in a temperature range of about 530–730°K and vacuum microbalance techniques in the temperature range 601–796°K and at pressures ranging from about 10 −6 –10 −4 atm. The results are concordant and demonstrate that GeSe vaporizes congruently under present experimental conditions according to the reaction GeSe(s) = GeSe(g). The mean values for the third law heat and second law entropy of reaction based on direct mass‐loss data are ΔH 298 0= 42.0 ± 1.5 kcal/mole and ΔS 298 0= 42.3 ± 1.6 eu. From these data the standard heat of formation and absolute entropy of GeSe(s) were calculated to be −10.1 ± 2.0 kcal/mole and 16.9 ± 2.0 eu, respectively.