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Proceedings Paper

Coupled effects of hydrostatic pressure and bipolar electric field on the FE-AFE phase transformation in 95/5 PZT
Author(s): J. C. Valadez; David M. Pisani; C. S. Lynch
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Paper Abstract

The behavior of 95/5 PZT subjected to bipolar electrical loading and hydrostatic pressure is studied experimentally. When 95/5 PZT is subjected to high enough hydrostatic pressure it undergoes a ferroelectric to antiferroelectric (FEAFE) phase transformation. Specimens were subjected to two pressure cycles from 0 to 550 MPa at a rate of 50 MPa/min under short circuit conditions. It was found that under the first pressure cycle the specimens undergo a FEAFE phase transformation at 330 MPa indicated by an abrupt compression of 2500 microstrain. Under the second pressure cycle, the transformation no longer occurs at a single pressure level, but is smoothed throughout loading. In another set of experiments, bipolar electric fields were applied up to 3 MV/m at discrete pressure levels. At low pressures, electric displacement-electric field plots exhibited open loop behavior characteristic of soft ferroelectrics. As the pressure was increased past the FE-AFE phase transformation threshold, the open loops closed to nearly linear dielectric. When the driving pressure was decreased the open loop behavior returned at a notably lower pressure level. The transformation pressure is therefore path dependent and is evidence of a pressure hysteresis.

Paper Details

Date Published: 3 April 2013
PDF: 8 pages
Proc. SPIE 8689, Behavior and Mechanics of Multifunctional Materials and Composites 2013, 868907 (3 April 2013); doi: 10.1117/12.2013753
Show Author Affiliations
J. C. Valadez, Univ. of California, Los Angeles (United States)
David M. Pisani, Univ. of California, Los Angeles (United States)
C. S. Lynch, Univ. of California, Los Angeles (United States)

Published in SPIE Proceedings Vol. 8689:
Behavior and Mechanics of Multifunctional Materials and Composites 2013
Nakhiah C. Goulbourne; Hani E. Naguib, Editor(s)

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