Microstructure-Property Relationships in Liquid Phase-Sintered High-Temperature Bismuth Scandium Oxide-Lead Titanate Piezoceramics

High‐temperature piezoelectrics are necessary for aeronautic and aerospace applications. The principal challenge for the insertion of piezoelectric materials is their limitation for upper use temperature, which is due to low Curie temperature and increasing conductivity at high temperatures. We inve...

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Bibliographic Details
Published inJournal of the American Ceramic Society Vol. 91; no. 9; pp. 2910 - 2916
Main Authors Sehirlioglu, Alp, Sayir, Ali, Dynys, Fred
Format Journal Article
LanguageEnglish
Published Malden, USA Blackwell Publishing Inc 01.09.2008
Blackwell
Wiley Subscription Services, Inc
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Summary:High‐temperature piezoelectrics are necessary for aeronautic and aerospace applications. The principal challenge for the insertion of piezoelectric materials is their limitation for upper use temperature, which is due to low Curie temperature and increasing conductivity at high temperatures. We investigated processing, microstructure, and property relationships of (1−x)BiScO3−(x)PbTiO3 composition as a promising high‐temperature piezoelectric. The effects of excess PbO and Bi2O3 and their partitioning in grain boundaries were studied using impedance spectroscopy, ferroelectric, and piezoelectric measurement techniques. Excess Pb addition increased the grain‐boundary conduction and the grain‐boundary area resulting in ceramics with higher AC‐conductivity (tan δ=0.9 and 1.7 for 0 and 5 at.% excess Pb at 350°C and at 10 kHz) that were not resistive enough to pole. Excess Bi addition increased the resistivity (tan δ=0.9 and 0.1 for 0 and 5 at.% excess Pb at 350°C and at 10 kHz), improved poling, and increased the piezoelectric coefficient from 354 to 408 pC/N for 5 at.% excess Bi addition. Thus, excess Bi2O3 proved to be a successful liquid phase forming additive to improve the 0.37BiScO3–0.63PbTiO3 piezoceramics for high‐temperature applications, as a result of increased resistivity and enhanced piezoelectric activity.
Bibliography:istex:5952B13EFB1CE98B0173077B6E9FA6121D1F4F46
ark:/67375/WNG-V0B6T4HL-6
ArticleID:JACE02555
*
Member, The American Ceramic Society.
C. A. Randall—contributing editor
This work was financially supported by AFOSR FA 9550‐06‐1‐0260
Presented at Materials Science and Technology Conference and Exhibition, Detroit, MI, September 16‐20, 2007 (Sosman Symposium).
ObjectType-Article-2
SourceType-Scholarly Journals-1
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ISSN:0002-7820
1551-2916
DOI:10.1111/j.1551-2916.2008.02555.x