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Aging-induced double hysteresis loops in bismuth-doped (Ba,Ca)TiO3 ferroelectric ceramics

Published online by Cambridge University Press:  31 January 2011

Sining Yun*
Affiliation:
Institute of Powder Engineering, School of Material Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; and Department of Materials Physics, School of Science, Xi'an Jiaotong University, Xi'an 710049, China
Jing Shi
Affiliation:
Department of Materials Physics, School of Science, Xi'an Jiaotong University, Xi'an 710049, China
Delong Xu
Affiliation:
Institute of Powder Engineering, School of Material Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
*
a) Address all correspondence to this author. e-mail: alexsyun1974@yahoo.com.cn
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Abstract

Bismuth-doped (Ba1−xCax)TiO3 ceramics (x = 0.10, Bi-BCT) were prepared by a conventional solid-state reaction technique. An abnormal double-like hysteresis polarization–electric (P–E) loop was observed at room temperature for aged Bi-BCT. Raman scattering gives critical evidence for the formation of O2− vacancies in Bi-BCT. The change from the single P–E loops in the fresh samples to the double loops in the aged samples excludes the existence of a ferroelectric–antiferroelectric transition in Bi-BCT. A reversible domain switching mechanism resulting from a symmetry-conforming short-range ordering of point defects gives a reasonable explanation for the naturally age-induced double-like P–E loops in Bi-BCT.

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Articles
Copyright
Copyright © Materials Research Society 2009

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