Piezoelectric device
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United States of America Patent
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Mar 18, 2003
Issued Date -
N/A
app pub date -
Mar 1, 2002
filing date -
May 24, 1999
priority date (Note) -
Expired
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Abstract
A piezoelectric device having an electromechanical coefficient, which can be applied to practical uses, is obtained by an energy-trapping effect using a piezoelectric ceramic having a layered perovskite structure provided with high-temperature resistance and little high-frequency loss. The piezoelectric device has a substrate formed of a piezoelectric ceramic having a layered perovskite structure. The c-axis in the substrate is preferentially oriented in the width direction thereof, and the substrate is polarized in the longitudinal direction. Two electrodes are formed on both main surfaces of the substrate so as to oppose each other in the vicinity of the central part thereof. As a material used for the substrate, a piezoelectric ceramic composition primarily composed of a ceramic composition represented by the general formula CaBi.sub.4 Ti.sub.4 O.sub.15 is preferably used.
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