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Synthesis and Ferroelectric Properties of Sr- and Nb-codoped Bi4−xSrxTi3−xNbxO12 Thin Films by Sol-Gel Method

Published online by Cambridge University Press:  17 March 2011

Hirofumi Matsuda ,
Takashi Iijima ,
Hiroshi Uchida ,
Isao Okada ,
Takayuki Watanabe  and
Hiroshi Funakubo
Hirofumi Matsuda
Affiliation:
Smart Struct. Res. Center, Natnl. Inst. Adv. Indust. Sci. Tech. (AIST) 1-1-1 Umezono, Tsukuba 305-8568, Japan
Takashi Iijima
Affiliation:
Smart Struct. Res. Center, Natnl. Inst. Adv. Indust. Sci. Tech. (AIST) 1-1-1 Umezono, Tsukuba 305-8568, Japan
Hiroshi Uchida
Affiliation:
Dept. Chem., Sophia Univ., Tokyo 102-8554, Japan
Isao Okada
Affiliation:
Dept. Chem., Sophia Univ., Tokyo 102-8554, Japan
Takayuki Watanabe
Affiliation:
Dept. Innov. Eng. Mater., Tokyo Inst. Tech., Yokohama 226-8502, Japan
Hiroshi Funakubo
Affiliation:
Dept. Innov. Eng. Mater., Tokyo Inst. Tech., Yokohama 226-8502, Japan
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Abstract

Ferroelectric Bi4Ti3O12 (BIT) thin films were modified by the substitution of Sr2+ ions for Bi3+ ions and of Nb5+ for Ti4+ (codoping) by spin-coating and decomposition of chemical solutions of metal-alkoxide materials (the nominal compositions of Bi4−xSrxTi3−xNbxO12 where x=0.0, 0.5, 1.0, 1.5). Single-phase thin films were crystallized above 550°C with BIT-type structure. The ferroelectric properties were found, though, with the values of Pr=10 μC/cm2 Ec=100 kV/cm, εr=300, and tanδ<5 % for Bi3.5Sr0.5Ti2.5Nb0.5O12 (x=0.5) annealed at 650 °C. Perhaps due to the lowering of the Curie temperature with increasing x, the maximum value of δr increased.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 688: Symposium C – Ferroelectric Thin Films X , 2001 , C4.14.1
Copyright
Copyright © Materials Research Society 2002

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