Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1994-01-27
1995-04-25
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310358, 252 629, H01L 4108, C04B 3549
Patent
active
054102090
ABSTRACT:
A piezoelectric material with a high fracture toughness and a large electromechanical coupling coefficient is disclosed. This piezoelectric material contains a composition which is represented by xPb(Sc.sub.1/2 Nb.sub.1/2)O.sub.3 -yPbTiO.sub.3 -zPbZrO.sub.3 -wPb(Me.sub.1/3 Nb.sub.2/3)O.sub.3, where Me is at least one metal selected from the group consisting of Mg, Zn and Ni, and x+y+z+w=1.00, x, y, z, and w being values falling within region which is defined by connecting points a, b, c, and d and which excludes a line ab, the points a, b, c, and d existing on the faces of a regular trigonal pyramid having apices P.sub.1, P.sub.2, P.sub.3, and P.sub.4 which correspond to Pb(Sc.sub.1/2 Nb.sub.1/2)O.sub.3, PbTiO.sub.3, PbZrO.sub.3 and Pb(Me.sub.1/3 Nb.sub.2/3)O.sub.3, respectively, and the points a, b, c, and d having the following coordinate values when the apices P.sub.1, P.sub.2, P.sub.3, and P.sub.4 have coordinate values of (X.sub.1, Y.sub.1, Z.sub.1, W.sub.1 =1, 0, 0, 0), (X.sub.2, Y.sub.2, Z.sub.2, W.sub.2 =0, 1, 0, 0, 0), (X.sub.3, Y.sub.3, Z.sub.3, W.sub.3 =0, 0, 1, 0), and (X.sub.4, Y.sub.4, Z.sub.4, W.sub.4 =0, 0, 0, 1):
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Victor J. Tennery, et al., "Ferroelectric and Structrual Properties of the Pb(Sc1/2 Nb1/2)1-x TixO3 System", Journal of The American Ceramic Society, vol. 51, No. 12, Dec. 21, 1968, pp. 671-674.
Saitoh Shiroh
Yamashita Yohachi
Budd Mark O.
Kabushiki Kaisha Toshiba
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