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Estimation of point defect parameters of solids on the basis of a defect formation model of melting (II). Vacancy formation enthalpy in relation to the heat of fusion and the increase of volume due to melting
Author(s) -
Bollmann W.,
Uvarov N. F.,
Hairetdinov E. F.
Publication year - 1989
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170240418
Subject(s) - enthalpy of fusion , melting point , vacancy defect , enthalpy , thermodynamics , fusion , halide , standard enthalpy of formation , inert gas , schottky defect , alkali metal , chemistry , enthalpy of atomization , inert , standard enthalpy change of formation , schottky diode , materials science , crystallography , inorganic chemistry , organic chemistry , linguistics , physics , philosophy , optoelectronics , diode
The mole fraction of vacancies within melts at their melting points is found to be x L = = 0.125 in the case of elements (with exception of inert gases), alkali halides, binary oxides and organic compounds. As to inert gases it is x L = 0.194. The formation enthalpy of vacancies (Schottky defects) is given by h S = L / x L ( L heat of fusion) in every case. The increase of volume due to melting can be explained well by the vacancy model of melting: Δ V = V S x L ( V S formation volume of Schottky defects).