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The precision determination of the lattice parameters and the coefficients of thermal expansion of BiFeO 3
Author(s) -
Bucci J. D.,
Robertson B. K.,
James W. J.
Publication year - 1972
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/s0021889872009173
Subject(s) - extrapolation , thermal expansion , curie temperature , lattice (music) , hexagonal crystal system , lattice constant , atmospheric temperature range , hexagonal lattice , chemistry , condensed matter physics , materials science , thermodynamics , analytical chemistry (journal) , physics , crystallography , mathematics , ferromagnetism , diffraction , mathematical analysis , optics , chromatography , antiferromagnetism , acoustics
The lattice parameters of BiFeO 3 were determined with the Straumanis method. At 25–13±0.02 °C, the hexagonal parameters are a h = 5.5799±0.0003, and ch = 13.8670±0.0005 Å. The temperature dependence of the lattice parameters in the range 20–325 °C is given by the equations: a h = 5.5764 Å + 6.06 × 10 −5 t , and c h = 13.8620 Å + 2.10 × 10 −4 t . In the range of 344–838 °C, the lattice parameters obey the following equations: a h = 5.5946 + 6.83 × 10 −5 t , and c h = 13.7251 + 9.05 × 10 −4 t −12.503 × 10 −7 t 2 + 9.40 × 10 −10 t 3 − 3.57 × 10 −13 t 4 . By extrapolation of the angular separation of the 11.0 and the 10.4 reflections, the electrical Curie temperature was determined to be 845±5 °C.