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Effective symmetry and physical properties of twinned perovskite ferroelectric single crystals

Published online by Cambridge University Press:  31 January 2011

Jiří Erhart  and
Wenwu Cao
Jiří Erhart
Affiliation:
Materials Research Laboratory, Pennsylvania State University, University Park, Pennsylvania 16802
Wenwu Cao
Affiliation:
Materials Research Laboratory, Pennsylvania State University, University Park, Pennsylvania 16802
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Abstract

The effective symmetry and material properties of twinned ferroelectric crystals with perovskite structure were analyzed. The twins or twinbands studied here were formed during ferroelectric phase transitions, which resulted in one of the following symmetry changes: m3m → 3m, m3m → 4mm, and m3m → mm2. It was found that the volume ratios of the two domains in a twin structure were not always equal due to the existence of defect pinning to the domain walls. This unequal partition changed the effective symmetry; hence, the effective macroscopic physical properties of the twin system. Using the data of LiNbO3, BaTiO3, and KNbO3, a detailed analysis has been carried out on macroscopic material property changes caused by the deviation from equal domain volume partition for crystals having 3m, 4mm, and mm2 symmetries.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 2 , February 2001 , pp. 570 - 577
Copyright
Copyright © Materials Research Society 2001

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References

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