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Crystalloluminescence produced during the micro‐fracture of growing crystallites
Author(s) -
Chandra B. P.,
Verma P. K.,
Ansari M. H.
Publication year - 1997
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.2170320511
Subject(s) - crystallite , nucleation , supersaturation , materials science , chemical physics , relaxation (psychology) , dielectric , crystallization , crystal (programming language) , charge carrier , composite material , mineralogy , condensed matter physics , crystallography , chemistry , thermodynamics , metallurgy , physics , optoelectronics , psychology , social psychology , computer science , programming language
The present paper reports the theory of crystalloluminescence (CRL) produced during the micro‐fracture of growing crystallites. Surface charges may be developed during the micre‐fracture of crystallites due to several processes like piezoelectrification, movement of charged dislocations, barodiffusion of defects near the moving crack etc. The surface charges may be neutralized by the movement of charge carriers produced due to the dielectric breakdown near the surface of crystallites and consequently the recombination luminescence may occur. Considering the basic concepts of crystallization from the supersaturated solution, expressions are derived which are able to explain satisfactorily the temporal, thermal, spectral concentration and other characteristics of the CRL. It is shown that the induction period for crystal nucleation, lifetime of supersaturation, size of crystallites and time constant for the relaxation of charges on the newly created surfaces may be determined from the CRL measurements.