| 摘要 |
The present invention provides a dielectric ceramic composition which can solve problems, involved in a conventional piezoelectric ceramic for an actuator using a tungsten bronze type composite oxide, i.e., a problem that the specific permittivity is so low (less than 2000) that the piezoelectric ceramic is unsuitable as a dielectric ceramic material for laminated ceramic capacitors, and a problem that, although Mn has the effect of improving the degree of sintering, since the specific permittivity is lowered with increasing the amount of Mn added, the conventional piezoelectric ceramic, when used as a dielectric ceramic material for laminated ceramic capacitors, poses a problem. The dielectric ceramic composition is composed mainly of a tungsten bronze type composite oxide represented by a compositional formula (K1-yNay)Sr2Nb5O15, wherein 0 <= y < 0.2, and contains 0.1 to 40 parts by mole, based on 100 parts by mole of the main component, of Mn as an auxiliary component.
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