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Ferroelastic phase transition in BiVO 4 II. Birefringence at simultaneous high pressure and temperature
Author(s) -
Wood I. G.,
Welber B.,
David W. I. F.,
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/s0021889880011971
Subject(s) - birefringence , monoclinic crystal system , tetragonal crystal system , phase transition , phase diagram , hydrostatic pressure , phase (matter) , materials science , diamond anvil cell , optics , condensed matter physics , chemistry , thermodynamics , crystallography , diffraction , physics , crystal structure , organic chemistry
The accurate measurement of optical birefringence at simultaneous high pressures and temperatures using a diamond‐anvil pressure cell is described. Data are presented for BiVO 4 which show that the optical birefringence may be described by mean‐field behaviour. An applied hydrostatic pressure of only 8 × 10 8 Pa reduces the mean‐field temperature of the ferroelastic monoclinic tetragonal phase transition from 519.7 to 393 K. A birefringence–pressure–temperature phase diagram is presented.