Department of Physics Papers

Document Type

Journal Article

Date of this Version

4-26-2011

Abstract

Interest in Pb-free ferroelectrics has intensified as the search for less toxic Pb replacements continues. Since Sn is isoelectronic with Pb, it has generated great interest. Most of this effort has focused on SnTiO3. Even though it shows impressive ferroelectricity in calculations, synthesis has proved elusive.We therefore use density-functional theory (DFT) to investigate B-site alternatives that involve smaller size to promote perovskite phase stability. In this paper, Sn(Al½Nb½)O3 (SAN) is investigated. We demonstrate that SAN is likely to be synthesizable, will be ferroelectric, and perhaps a good piezoelectric material as well. We discuss how cation displacements and their interactions affect the polarization of the solid solution.We also explore the electronic properties of the SAN solid solution and correlate them to the structural findings.

Comments

Suggested Citation:
J.W. Bennett, I. Grinberg, P.K. Davies and A.M. Rappe. (2011). Pb-free ferroelectrics investigated with density functional theory: SnAl½Nb½O3 perovskites. Physical Review B 83, 144112.

© 2011 The American Physical Society
http://dx.doi.org/10.1103/PhysRevB.83.144112

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Date Posted: 18 May 2011

This document has been peer reviewed.