| 摘要 |
Provided is a piezoelectric ceramic with a wider operating temperature range capable of obtaining a larger amount of displacement and being easily sintered, as well as being superior in terms of ultra-low emission, environmental friendliness and ecology. A piezoelectric substrate 1 comprises a composition including a perovskite-type oxide (Na<SUB>1-x-y-z</SUB>K<SUB>x</SUB>Li<SUB>y</SUB>Ag<SUB>z</SUB>)(Nb<SUB>1-w</SUB>Ta<SUB>w</SUB>)O<SUB>3 </SUB>and a tungsten bronze-type oxide M(Nb<SUB>1-v</SUB>Ta<SUB>v</SUB>)<SUB>2</SUB>O<SUB>6 </SUB>(M is an element of Group 2 in the long form of the periodic table of the elements). The values of x, y and z are preferably within a range of 0.1<=x<=0.9, 0<=y<=0.2, and 0<=z<=0.05, respectively. The content of the tungsten bronze-type oxide is preferably 5.3 mol % or less. Thereby, a higher Curie temperature and a larger amount of displacement can be obtained, and sintering can be more easily carried out.
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