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Further observations on the effects of nonhydrostatic compression on the FR1 → AO polymorphic phase transformation in niobiumdoped, lead-zirconate-titanate ceramic

Published online by Cambridge University Press:  03 March 2011

David H. Zeuch ,
Stephen T. Montgomery  and
Jeffrey D. Keck
David H. Zeuch
Affiliation:
Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185-0751
Stephen T. Montgomery
Affiliation:
Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185-0751
Jeffrey D. Keck
Affiliation:
Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185-0751
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Abstract

We recently performed a series of experiments on Nb-doped lead-zirconate-titanate ceramic to investigate the influence of constant shear stresses on the displacive, first-order rhombohedral/ferroelectric → orthorhombic/antiferroelectric polymorphic transformation. In a previous paper and report we demonstrated that increasing shear stresses lowers the mean stress and confining pressure at which the transformation occurs, but we did not identify a criterion by which the transformation could be predicted to take place under nonhydrostatic stress. In this paper we use the dielectric anomaly which accompanies the transformation as an indicator of onset of the transition, and correct for the effects of high-pressure-seal friction on measurement of the maximum compressive stress applied to the test specimens during deviatoric loading. We show that a convincing case can be made that the transformation occurs when the maximum compressive stress equals the hydrostatic pressure at which the transformation would otherwise occur.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 5 , May 1994 , pp. 1322 - 1327
Copyright
Copyright © Materials Research Society 1994

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References

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