Lead-free piezoelectric ceramics vs. PZT?
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Investigations in the development of lead-free piezoelectric ceramics have recently claimed properties comparable to that of PZT-based materials. In this work, the dielectric and piezoelectric properties of the various systems were contrasted in relation to their respective Curie temperatures. Analogous to PZT, enhanced properties are noted for morphotropic phase boundary (MPB) compositions in the Na,BiTiO3–BaTiO3 and the ternary system with K,BiTiO3, but offer properties significantly lower than that of PZTs. The consequence of a ferroelectric to antiferroelectric transition well below T C further limits their usefulness. Though comparable with respect to T C, enhanced properties reported in the K,NaNbO3 family are the result of increased polarizability associated with the T orthor-tetragonal polymorphic phase transition being compositionally shifted downward and not from a MPB as widely reported. As expected, the properties are strongly temperature dependent unlike that observed for MPB systems.
KeywordsPiezoelectric Lead-free ceramic PZT
- 1.For example: the legislation will be enforced in the EU as the draft directives on waste from electrical and electronic equipment (WEEE), restriction of hazardous substances (RoHS) and end-of life vehicles (ELV)Google Scholar
- 2.B. Jaffe, W. Cook, H. Jaffe, Piezoelectric Ceramics, (Academic, New York, 1971) p.92Google Scholar
- 3.D. Berlincourt, in Ultrasonic Transducer Materials: Piezoelectric Crystals and Ceramics (ed), O.E. Mattiat, (Plenum, London, 1971), Ch.2Google Scholar
- 4.A.J. Moulson, J.M. Herbert, Electroceramics––Materials, Properties, Applications, (Chapman & Hall, London, 1990)Google Scholar
- 5.J.M. Herbert, Ferroelectric Transducers and Sensors, (Gordon and Breach Science, New York, 1982)Google Scholar
- 14.Y. Saito, H. Takao, 12th US–Japan Seminar on Dielectric and Piezoelectric Ceramics (ed.), C. Wu, H. Kishi, C. Randall, P. Pinceloup, H. Funakubo, (Maryland, 2005), p.103Google Scholar
- 26.D. Berlincourt, in Ultrasonic Transducer Materials: Piezoelectric Crystals and Ceramics (ed.), O.E. Mattiat, (Plenum, London, 1971), Ch.2Google Scholar
- 28.D. Schofield, R.F. Brown, Can. J. Phys. 35, 594 (1957)Google Scholar
- 29.Y. Doshida, H. Kishi, Y. Hattori, A. Makiya, S. Tanaka, K. Uematsu, T. Kimura, 12th US–Japan Seminar on Dielectric and Piezoelectric Ceramics (ed.), C. Wu, H. Kishi, C. Randall, P. Pinceloup, H. Funakubo, (Maryland, 2005), p.123Google Scholar
- 34.S.J. Zhang, T.R. Shrout, H. Nagata, Y. Hiruma, T. Takenaka, IEEE Trans. Ultrason. Ferroelectr. Freq. Control (in press)Google Scholar