| 摘要 |
The present invention is directed to a new group of pure and doped bismuth layer structured perovskite high temperature piezoelectric ceramics and sensors made of the same. The new materials have the formula of [Bi2O2][Am-1BmO3m+1], where m=2, A is mono-, di-, or trivalent ions or a combination of them, B is transition elements such as Fe3+, Ti4+, Nb5+, Ta5+, W6+, Mo6+ or a combination of them. The ceramics have high Curie temperature of 900~940 °C. The sensors claimed in the present invention utilize [Bi2O2][Am_1 BmO3m+1] ceramics parts as sensing elements in various shapes and dimensions and can be used to sense force, acceleration, and pressure at very high temperatures.
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