PIEZOELECTRIC CERAMICS, PIEZOELECTRIC CERAMIC COMPOSITIONS, AND PIEZOELECTRIC ELEMENTS
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United States of America Patent
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Issued Date -
Apr 2, 2015
app pub date -
Sep 25, 2014
filing date -
Sep 30, 2013
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Abandoned
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Abstract
A piezoelectric ceramic contains as a main component an oxide which is represented by the general formula: sA1B1O3-t(Bi.A2)TiO3-(1-s-t)BaMO3 (where A1 is at least one element selected from among alkali metals; B1 is at least one element selected from among transition metal elements and contains Nb; A2 is at least one element selected from among alkali metals; and M is at least one element selected from the 4A group and contains Zr). In the general formula, s and t satisfy 0.905≦s≦0.918, 0.005≦t≦0.02, and a piezoelectric constant d33(25) at 25° C. and a piezoelectric constant d33(200) at 200° C. satisfy the relationship (d33(25)−d33(200)/d33(25)≦0.13.
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