| 摘要 |
PURPOSE:To provide a composition which uses a tetragonal system, is kept in good proportion to a strong electric field to cause large distortion, is not much affected by the temperature change of atmosphere and is excellent in durability. CONSTITUTION:A ferroelectric ceramic composition is obtained by addition of SnO2, Nb2O5, SrO or BaO, etc., to PZT or a PZT system substance. Its crystal system is tetragonal wherein Zr ratio expressed as Zr/(Zr+Ti) is set to be at least 0.5mol% smaller than that of a phase boundary. |
