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Search For New Piezoelectrics

Published online by Cambridge University Press:  01 February 2011

Panchapakesan Ganesh
Affiliation:
cohen@gl.ciw.edu, United States
Ronald Cohen
Affiliation:
cohen@gl.ciw.edu, United States
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Abstract

Recent first principles simulations using density functional theory and novel low temperature x-ray diffraction experiments show the existence of a high pressure morphtotropic phase boundary (MPB) in pure PbTiO3. In this paper we apply chemical pressure by substituting smaller atoms in the ABO3 ‘A’ and ‘B’ sites. We find that the ground state of layered PbSnTiO3 (PSnT) is Pmm2, and for rocksalt SnGeTiO3 and PbGeTiO3 is R3m. The polarization of PbSnTiO3 is large (1.13,0,0)C/m2 and is due to the large Born effective charge of the small ‘Sn’ atom. We estimate the d33 for PSnT to be about 2400 pC/N, which is as large as that of currently used relaxor ferroelectrics.

Type
Research Article
Copyright
Copyright © Materials Research Society 2009

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References

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