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Thermal expansivity and spontaneous stain temperature dependence in Tb 2 (MoO 4 ) 3
Author(s) -
Abrahams S. C.,
Bernstein J. L.,
Lissalde F.,
Nassau K.
Publication year - 1978
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/s0021889878014314
Subject(s) - tetragonal crystal system , orthorhombic crystal system , atmospheric temperature range , thermal expansion , lattice constant , dielectric , condensed matter physics , lattice (music) , thermal , materials science , phase transition , diffraction , thermodynamics , chemistry , crystallography , crystal structure , optics , physics , composite material , optoelectronics , acoustics
The lattice constants of Tb 2 (MoO 4 ) 3 have been measured by X‐ray diffraction in the temperature range 296 to 505 K, and by dilatometry in the range 296 to 1015 K. The coefficients of thermal expansion for both orthorhombic and tetragonal phases are presented. The c ‐axis lattice constant in the paraelectric–paraelastic tetragonal phase above the transition temperature T c varies by less than 2 parts in 10 4 , with a shallow minimum at 1.23 T c . The temperature dependence of the spontaneous strain is shown to follow that of the spontaneous polarization very closely, confirming their linear proportionality.