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Elastic and Thermoelastic Properties of the Twinned Perovskite LaGaO 3 and the Cubic Untwinned Perovskite La 0.294 Sr 0.706 Al 0.647 Ta 0.353 O 3
Author(s) -
Haussühl S.,
Mateika D.
Publication year - 1991
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170260420
Subject(s) - thermoelastic damping , perovskite (structure) , materials science , ionic bonding , condensed matter physics , mineralogy , crystallography , thermodynamics , chemistry , ion , physics , thermal , organic chemistry
The elastic and thermoelastic constants of twinned crystals of LaGaO 3 and untwinned crystals of La 0.294 Sr 0.706 Al 0.647 Ta 0.353 O 3 have been measured by ultrasonic resonance methods. Both materials exhibit a quite similar elastic behaviour characteristic, as for perovskites. Employing a simple formula for ionic crystals, the elastic constants of both oxygen perovskites reveal a depression of about one third in comparison to the fluor perovskite LiBaF 3 .