| 摘要 |
A piezoelectric solid solution composition containing, as a main component, a composition represented by the following general formula: {Mx(NayLizK1-y-z)1-x}1-m{(Ti1-u-vZruHfv)x(Nb1-wTaw)1-x}O3 is disclosed. In the formula, M represents a combination of at least one member selected from the group consisting of (Bi0.5K0.5), (Bi0.5Na0.5) and (Bi0.5Li0.5) and at least one member selected from the group consisting of Ba, Sr, Ca and Mg; and in the formula, x, y, z, u, v, w and m are in the following ranges: 0.06<x≦̸0.3, 0≦̸y≦̸1, 0≦̸z≦̸0.3, 0≦̸(y+z)≦̸1, 0<u≦̸1, 0≦̸v≦̸0.75, 0≦̸w≦̸0.2, 0<(u+v)≦̸1 and −0.06≦̸m≦̸0.06. This solid solution composition preferably forms the same rhombohedral-tetragonal morphotropic phase boundary as in PZT, is environmentally friendly, and displays an excellent piezoelectric constant d33.
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