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Nucleation velocity of NaPO 3 melts
Author(s) -
Grantscharova E.,
Gutzow I.
Publication year - 1990
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.2170250903
Subject(s) - nucleation , crystallization , supercooling , thermodynamics , atmospheric temperature range , homogeneous , crystal growth , materials science , activation energy , crystal (programming language) , vitrification , mineralogy , crystallography , chemistry , physics , computer science , programming language , nuclear physics
The time τ for visible crystallization of NaPO 3 melts is measured in the whole range of undercoolings from the melting temperature T m to the temperature of vitrification T g . It is shown that the time τ, needed for the appearance of a visible crystallization at high supersaturations is determined by the linear growth rate, whereas the rate of heterogeneous nucleation is the main factor, determining the experimentally measured time τ at low supersaturations. The specific surface energy σ at the melt‐crystal interface is calculated from the data on nucleation velocity in the vicinity of T m and the temperature dependences of both heterogeneous and homogeneous nucleation velocity for NaPO 3 melts are constructed. It is concluded that at normal cooling rates only nucleation, initiated by active crystallized cores could be observed for NaPO 3 .