Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1984-02-29
1986-02-04
Cooper, Jack
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310358, 252 629, C04B 3549
Patent
active
045688486
ABSTRACT:
A piezoelectric ceramic for acoustic surface wave devices which consists essentially of a solid solution of the ternary system Pb(Sn.sub..alpha. Sb.sub.1-.alpha.)O.sub.3 -PbTiO.sub.3 -PbZrO.sub.3 having a composition showing a phase transition between a ferroelectric rhombohedral low temperature phase (F.sub.R(LT)) and a ferroelectric rohombohedral high temperature phase (F.sub.R(HT)) at a temperature within the range from -20.degree. C. to +80.degree. C. The solid solution consists essentially of a main component expressed by the formula:
xPb(Sn.sub..alpha. Sb.sub.1-.alpha.)O.sub.3 -yPbTiO.sub.3 -zPbZrO.sub.3
where in x+y+z=1.00, 1/4.ltoreq..alpha..ltoreq.3/4, and contains, as an additive, manganese in oxide form in an amount of 0.05 to 5.0 wt % when converted into MnO.sub.2 and, if necessary, further contains at least one element selected, from magnesium and chromium in oxide form in respective amounts of 0.05 to 5.0 wt % when respectively converted into MgO and Cr.sub.2 O.sub.3.
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Cooper Jack
Murata Manufacturing Co, Ltd.
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