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Multiple dielectric anomalies in xBiLaO3–(1 − x)PbTiO3 piezoelectrics

Published online by Cambridge University Press:  31 January 2011

Runrun Duan ,
Michael S. Haluska  and
Robert F. Speyer
Runrun Duan
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245
Michael S. Haluska
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245
Robert F. Speyer*
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245
*
a) Address all correspondence to this author. e-mail: robert.speyer@mse.gatech.edu
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Abstract

Compositions of xBiLaO3–(1 − x) PbTiO3 over the range 0 ≤ x ≤ 0.225 were calcined and sintered. The dielectric constant with temperature and differential scanning calorimetry measurements were in excellent agreement with respect to Curie-like tetragonal to cubic transformations starting at 495 °C for pure PbTiO3, shifting to lower temperatures with increasing x. For compositions of x ≥ 0.05, a second higher-temperature (∼600 °C) endotherm, and matching dielectric anomaly, were consistently observed, for which there were no structural changes indicated by hot-stage x-ray diffraction. This transformation was speculated to be based on a thermally induced desegregation of B-site cations.

Keywords

Dielectric propertiesPhase transformationX-ray diffraction (XRD)
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 2 , February 2008 , pp. 565 - 569
Copyright
Copyright © Materials Research Society 2007

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References

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