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Elastic and Thermoelastic Properties of the Twinned Perovskite LaGaO3 and the Cubic Untwinned Perovskite La0.294Sr0.706Al0.647Ta0.353O3

✍ Scribed by Prof. Dr. S. Haussühl; Dr. D. Mateika

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
211 KB
Volume
26
Category
Article
ISSN
0232-1300

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✦ Synopsis

Elastic and Thermoelastic Properties of the Twinned Perovskite LaGaO, and the Cubic Untwinned 2 94" 0.70 ,*'(I. 64 TTa0.3 5 3 O3 The elastic and thermoelastic constants of twinned crystals of LaGaO, and untwinned crystals of L a o . ~~~s r o , 7 ~6 A ~~. 6 ~7 T a ~, 3 ~~0 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,.

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