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Ionic doping effects on crystal structure and relaxation character in Bi0.5Na0.5TiO3 ferroelectric ceramics

Published online by Cambridge University Press:  03 March 2011

Dan Shan ,
Yuanfang Qu  and
Jianjing Song
Dan Shan*
Affiliation:
Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin 300072, China
Yuanfang Qu
Affiliation:
Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin 300072, China
Jianjing Song
Affiliation:
Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin 300072, China
*
a) Address all correspondence to this author. e-mail: song_and_shan@hotmail.com
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Abstract

The effects of ionic doping in Bi0.5Na0.5TiO3 (BNT) ceramics were investigated. Pure and doped BNT samples containing 0 to 16 at.% Ba2+ and 0 to 1.0 at.% Ce4+ were synthesized at 1135 to 1200 °C for 2 h in ambient atmosphere. Temperature dependences of dielectric properties were analyzed. These results suggest that Ba2+ and Ce4+ replace the ions in A and B sites of perovskite structures, and the lattice structure is altered. The component differences of each crystal domain lead to variance of phase transition temperature, which enhances the relaxation character in BNT ceramics, and the dielectric properties were consequently improved.

Keywords

CeramicDielectric propertiesPhase transformation
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 3 , March 2007 , pp. 730 - 734
Copyright
Copyright © Materials Research Society 2007

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References

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