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Ferroelastic phase transition in BiVO 4 I. Birefringence measurements using the rotating‐analyser method
Author(s) -
Wood I. G.,
Glazer A. M.
Publication year - 1980
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s002188988001196x
Subject(s) - birefringence , analyser , monoclinic crystal system , tetragonal crystal system , phase transition , optics , phase (matter) , materials science , field (mathematics) , condensed matter physics , chemistry , physics , crystallography , crystal structure , mathematics , pure mathematics , organic chemistry
A brief review of methods of measuring birefringence is given. Apparatus for the accurate measurement of optical birefringence at high temperatures using a modulation (rotating‐analyser) method is described in detail, together with suggestions for further applications of the equipment. The technique is applied to the particular case of the ferroelastic monoclinic–tetragonal phase transition in BiVO 4 . The birefringence was found to show mean‐field behaviour over a wide temperature range with a mean‐field transition temperature of 519.9 (3) K.