Poling Field Dependence of Ferroelectric Properties in Alkali Bismuth Titanate Lead-Free Ceramics

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概要

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• The DC poling field dependence of ferroelectric properties was investigated to evaluate the mechanism of domain alignment in lead-free ceramics of the forms of ($1-x$)(Na0.5Bi0.5)TiO3–$x$(K0.5Bi0.5)TiO3 ($x=0.08--0.28$), 0.79(Na0.5Bi0.5)TiO3–0.20(K0.5Bi0.5)TiO3–0.01Bi(Fe0.5Ti0.5)O3 and ($1-x$)(Na0.5Bi0.5)TiO3–$x$BaTiO3 ($x=0.03--0.11$). From the DC poling field ($E$) dependence of ferroelectric properties, asymmetrical shapes in piezoelectric constants vs $\pm E$ caused by nonuniform mobility of domain alignment in the application of positive and negative poling fields were observed in the small amount substitution by (K0.5Bi0.5)TiO3 ($x\leqq 0.11$) and BaTiO3 ($x\leqq 0.03$). On the other hand, symmetrical shapes in piezoelectric constants vs $\pm E$ were observed in higher piezoelectricity with lower frequency constant accompanied with typical domain clamping. The effects to improve ferroelectric properties by Bi(Fe0.5Ti0.5)O3 and by BaTiO3 substitutions for (Na0.5Bi0.5)TiO3 were also proved by the measurement of $P$–$E$ hysteresis loops.

• 2010-09-25

著者

• Furukawa Masahito

  Materials and Process Development Center, TDK Co., Ltd.

• Tsukada Takeo

  Materials Research Center Tdk Corporation

• Ogawa Toshio

  Department of Electrical and Electronic Engineering, Shizuoka Institute of Science and Technology, Fukuroi, Shizuoka 437-8555, Japan

• Ogawa Toshio

  Department of Electrical and Electronic Engineering, Faculty of Science and Technology, Shizuoka Institute of Science and Technology, 2200-2 Toyosawa, Fukuroi, Shizuoka 437-8555, Japan

• Nishina Takayuki

  Department of Electrical and Electronic Engineering, Shizuoka Institute of Science and Technology, Fukuroi, Shizuoka 437-8555, Japan

• Tsukada Takeo

  Materials and Process Development Center, TDK Corp., 570-2 Matsugashita, Minamihatori, Narita, Chiba 286-8588, Japan

• Tsukada Takeo

  Materials and Process Development Centre, TDK Corporation, Narita, Chiba 286-8588, Japan

• Ogawa Toshio

  Department of Chemistry, College of General Education, Nagoya University

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