Method for preparing piezoelectric ceramics
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMasamitsu Nishida, Syunichiro Kawashima, Ichiro Ueda, Hiromu Ouchi
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Abstract
A piezoelectric ceramic elements obtained by hot-press sintering a composition expressed by the formula: (1-w)PbTi.sub.1-z Zr.sub.z O.sub.3 +wMnO.sub.2 at a temperature of 1050.degree. to 1300.degree. C. under a pressure of 100 to 500 Kg/cm.sup.2 for 0.5 to 24 hours shows a mechanical quality factor of 200 or more and a Poisson's ratio of more than 1/3 and gives a piezoelectric material having a large coupling coefficient which can be processed into a thin sheet having a thickness of 30 .mu.m and is especially suitable as a material for resonators and filters by utilizing its thickness extensional vibration.
Claims4
Process for preparing a piezoelectric ceramic body which comprises hot-press sintering a composition expressed by the formula:
- (1-w)(PbTi.sub.1-z Zr.sub.z O.sub.3)+wMnO.sub.2
- wherein z and w satisfy respectively the formulae:
- 0.48.ltoreq.z.ltoreq.0.64 and 0.004.ltoreq.w.ltoreq.0.06, at a temperature of 1050.degree. to 1300.degree. C. under a pressure of 100 to 500 kg/cm.sup.2 for 0.5 to 24 hours.
Process for preparing a piezoelectric ceramic body which comprises mixing a composition expressed by the formula:
- (1-w)(PbTi.sub.1-z Zr.sub.z O.sub.3)+wMnO.sub.2
- wherein z and w satisfy the relations:
- 0.48.ltoreq.z.ltoreq.0.64 and 0.004.ltoreq.w.ltoreq.0.06,
- calsinating, pulverizing, shaping and hot-press sintering the obtained material at a temperature of 1050.degree. to 1300.degree. C. under a pressure of 100 to 500 kg/cm.sup.2 for 0.5 to 24 hours.
Process for preparing a piezoelectric ceramic body which comprises hot-press sintering a composition expressed by the formula:
- (1-w)(PbTi.sub.1-z Zr.sub.z O.sub.3)+wMnO.sub.2
- wherein z and w satisfy the relations:
- 0.48.ltoreq.z.ltoreq.0.64 and 0.004.ltoreq.w.ltoreq.0.06, and
- wherein 0 to 10 atom percentage (except for 0 percentage) of Pb is substituted with one or more selected from the group consisting of Sr, Ca and Ba, at a temperature of 1050.degree. to 1300.degree. C., under a pressure of 100 to 500 kg/cm.sup.2 for 0.5 to 24 hours.
Process for preparing a piezoelectric ceramic body which comprises mixing a composition expressed by the formula:
- (1-w)(PbTi.sub.1-z Zr.sub.z O.sub.3)+wMnO.sub.2
- wherein z and w satisfy the relations:
- 0.48.ltoreq.z.ltoreq.0.64 and 0.004.ltoreq.w.ltoreq.0.06,
- and wherein 0 to 10 atom percentage (except for 0 percentage) of Pb is substituted with one or more selected from the group consisting of Sr, Ca and Ba, calcinating, pulverizing, shaping and hot-press sintering the obtained material at a temperature of 1050.degree. to 1300.degree. C. under a pressure of 100 to 500 kg/cm.sup.2 for 0.5 to 24 hours.
Dependencies are inferred from the claim text.