High-Sensitivity Piezoelectric, Low-Tolerance-Factor Perovskites by Mechanosynthesis

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• 作者：M. Alguer&oacute ; J. Ricote ; T. Hungrí ; a ; A. Castro
• 刊名：Chemistry of Materials
• 出版年：2007
• 出版时间：October 2, 2007
• 年：2007
• 卷：19
• 期：20
• 页码：4982 - 4990
• 全文大小：636K
• 年卷期：v.19,no.20(October 2, 2007)
• ISSN：1520-5002

文摘

Ferroelectric low-tolerance-factor perovskites are gathering a lot of attention in the search for novelperovskite solid solutions with a morphotropic phase boundary, which present the highest piezoelectriccoefficients known. However, thermodynamic stability is an issue, and powders and ceramics of a numberof compositions in very promising systems cannot be synthesized and processed but by high-pressuretechniques. This is the case of Pb(Zn_1/3Nb_2/3)O₃-PbTiO₃ with piezoelectric coefficients as high as 2500pC N^-1 and of the BiMO₃-PbTiO₃ (M for metal) systems with a high Curie temperature, which areanticipated to enable high sensitivity at temperatures above 300 C. We report here mechanochemicalactivation experiments on 0.92Pb(Zn_1/3Nb_2/3)O₃-0.08PbTiO₃ that strongly suggest that mechanosynthesisis a good alternative for preparing high-sensitivity piezoelectric, low-tolerance perovskite materials. Thisis demonstrated by processing ceramics of the Pb(Zn_1/3Nb_2/3)O₃-Pb(Fe_1/2Nb_1/2)O₃-PbTiO₃ and BiScO₃-PbTiO₃ systems from mechanosynthesized powders. Stabilization mechanisms are discussed, and associatedeffects are established.