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 | Zendy

Bollmann W. | Zendy; Uvarov N. F. | Zendy; Hairetdinov E. F. | Zendy

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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).

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