Cation deficiency effect on negative thermal expansion of ferroelectric PbTiO3

Xin Peng; Yangchun Rong; Longlong Fan; Kun Lin; He Zhu; Jinxia Deng; Jun Chen; Xianran Xing

doi:10.1039/C5QI00154D

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Cation deficiency effect on negative thermal expansion of ferroelectric PbTiO₃†

Xin Peng,^a Yangchun Rong,^a Longlong Fan,^a Kun Lin,^a He Zhu,^a Jinxia Deng,^b Jun Chen^a and Xianran Xing*^a

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* Corresponding authors

^a Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, P. R. China

^b Department of Chemistry, University of Science and Technology Beijing, Beijing, P. R. China
E-mail: xing@ustb.edu.cn
Fax: +86 10 6233 2525
Tel: +86 10 62334200

Abstract

It is known that negative thermal expansion (NTE) in PbTiO₃ (PT) ferroelectrics can be controlled by chemical substitutions. In the present work, however, we report a method to change the NTE of PT by introducing cation deficiency at both the A (Pb²⁺) and B sites (Ti⁴⁺). We investigated the spontaneous polarization, tetragonality c/a, coefficient of thermal expansion, and Curie temperature T_C with 8% Pb²⁺ deficient PT (P₉₂T), 2% Ti⁴⁺ deficient PT (PT₉₈), and pure PT. We found that while Pb²⁺ deficiency distinctively weakens the NTE, the effect of B-site deficiency could be ignored. These phenomena are ascribed to the NTE mechanism of spontaneous volume ferroelectrostriction. The present study provides a possible way to control the NTE of PT-based materials.

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Article information

DOI: https://doi.org/10.1039/C5QI00154D
Article type: Research Article
Submitted: 20 Aug 2015
Accepted: 02 Oct 2015
First published: 06 Oct 2015

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Inorg. Chem. Front., 2015,2, 1091-1094

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Cation deficiency effect on negative thermal expansion of ferroelectric PbTiO₃

X. Peng, Y. Rong, L. Fan, K. Lin, H. Zhu, J. Deng, J. Chen and X. Xing, Inorg. Chem. Front., 2015, 2, 1091 DOI: 10.1039/C5QI00154D

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