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Ultrasonic Transducers by K Nakamura

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5

High-Curie-temperature piezoelectric single crystals of the Pb(ln1/2Nb1/2)O3-Pb(Mg1/3 Nb2/3)O3-PbTiO3 ternary system

Y. Yamashita,     Toshiba Research Consulting Corporation, Japan

Y. Hosono,     Toshiba Corporation, Japan

Abstract:

This chapter considers piezoelectric single crystals (PSCs) with a large piezoelectric constant (d33), high Curie temperature (Tc), high phase-change temperature (Trt) and high coercive field (Ec). Their piezoelectric properties are greatly superior to those of Pb(Zr,Ti)O3 (PZT) ceramics so binary PSCs are used for transducer applications. PZNT and PMNT PSCs have shortcomings: low Tc, low Trt and low Ec. Ternary systems are used to overcome the problems of PZT ceramics, binary PZNT and PMNT PSCs. Single crystals ...

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