Electrical Properties of Mn-modified CaBi4Ti4O15 Piezoelectrics for High Temperature Application

doi:10.3724/SP.J.1077.2008.00626

Abstract

Abstract: Mn-modified CaBi₄Ti₄O₁₅ (CBT+x mol% MnCO₃) layer-structured piezoelectric ceramics were prepared by the solid state reaction technology. All samples have the same Curie temperature of 780℃, but the dielectric loss at high temperature is remarkably lowered by Mn addition. With increasing content of Mn, the remnant polarization is slightly decreased; the dielectric constant at room temperature decreases from 173 to 162; and the mechanical quality factor increases from 2700 to 4400. The piezoelectric constant d₃₃ is enhanced from 7 to 14.5. The resistivity of 1.0mol% Mn modified sample is found to be 10⁸Ω·cm at 500℃, 50 times higher than that of pure CBT. The Arrehenius plot of Mn-modified CBT is fitted by 3 straight lines, while that of pure CBT is fitted by 2 straight lines. The results suggest that the Mn modified CBT is a potential material for high temperature sensing application.

Key words: piezoelectric ceramics, Mn-modified, resistivity, CaBi₄Ti₄O₁₅

CLC Number:

TM 282

GU Da-Guo,LI Guo-Rong,ZHENG Liao-Ying,ZENG Jiang-Tao,DING Ai-Li,YIN Qing-Rui. Electrical Properties of Mn-modified CaBi₄Ti₄O₁₅ Piezoelectrics for High Temperature Application[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.00626.

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Electrical Properties of Mn-modified CaBi₄Ti₄O₁₅ Piezoelectrics for High Temperature Application

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