Piezotech LLC

Grant Adam Morris

Jared Brosch

A piezoelectric buzzer includes a vibrating layer capable of withstanding temperatures in excess of 260&#xb0; C. for at least five minutes while still maintaining its ability to vibrate and produce a buzzing sound at a level of at least 80 dB, and a high temperature piezoelectric material having a Curie temperature in excess of 260&#xb0; C. and one or more of the following properties: a planar coupling coefficient (k) of at least about 0.5; a longitudinal coupling coefficient (k) of at least about 1500; and a mechanical quality factor (Q) of at least about 2000. The piezo material may have a combination of these properties such that the product (k)(k)(Q) is at least about 1.5&#xd7;10. The piezoelectric material may have a base formula of PbSr(MnSb)(ZrTi)Owith x ranging from 0.95 to 0.99, y ranging from 0.92 to 0.97, and z ranging from 0.45 to 0.55, and may further include dopants in the amounts of about 0.4% CeO, about 1% CuO, and about 4% NbO.

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Grant Adam Morris