Piezoelectric material

摘要

A lead-free piezoelectric material that does not undergo depolarization in a wide operating temperature range and has a good piezoelectric constant is provided. A piezoelectric material include a perovskite-type metal oxide represented by (Ba1-xCax)a(Ti1-yZry)O3 (where 1.00≦a≦1.01, 0.125≦x≦0.175, and 0.055≦y≦0.090) as a main component, and manganese incorporated in the perovskite-type metal oxide. The manganese content relative to 100 parts by weight of the perovskite-type metal oxide is 0.02 parts by weight or more and 0.10 parts by weight or less on a metal basis.

主权项

1. A piezoelectric material comprising:
a perovskite-type metal oxide represented by general formula (1) as a main component
(Ba1-xCax)a(Ti1-yZry)O3 (where 1.00≦a≦1.01, 0.125≦x≦0.175, and 0.055≦y≦0.090)  (1);  and a manganese component, wherein a manganese content relative to 100 parts by weight of the perovskite-type metal oxide is 0.02 parts by weight or more and 0.10 parts by weight or less on a metal basis, wherein an auxiliary component content other than manganese relative to 100 parts by weight of the perovskite-type metal oxide is less than 1.2 parts by weight on an oxide basis, wherein the piezoelectric material is constituted by crystal grains having an average circular equivalent diameter of more than 1.0 μm and less than 10.8 μm, and wherein the piezoelectric material has a relative density of 91.8% or more and 100% or less.