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On the coexistence of phases at the α–β transition in quartz
Author(s) -
Semenchenko V. K.,
Bodnar I. T.,
Fotchenkov A. A.
Publication year - 1979
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19790140613
Subject(s) - phase transition , quartz , impurity , phase (matter) , materials science , condensed matter physics , crystallography , chemical physics , chemistry , physics , organic chemistry , composite material
The character of the α–β transition in crystals of natural and synthetic quartz has been studied by measuring the refractive index. The coexistence of two different crystallographic modifications over some temperature range has been established. The α–β phase transition is supposed to be attributed to the near‐critical phase transitions. In synthetic quartz with Al and Fe structural impurity the α–β transition consists of two successive transitions. First the transition from the α‐phase to an intermediate one takes place, then the intermediate phase is transformed into the β‐Phase. Within a certain temperature range there exists only the intermediate phase.