| 摘要 |
<p>The present invention provides a lead niobate piezoelectric ceramic composition useful for a piezoelectric ceramic element employable at a high temperature, such as a piezoelectric ceramic sensor, which is burned in air and which has a Curie temperature of over 400C. The piezoelectric ceramic composition contains as a main component a ceramic composition having a tungsten bronze type crystal structure and represented by the formula (Pb1-(a+b+c)Al2aA2bA32c/3)x(Nb1-(d+e+f+g)Bl5d/3B25e/4B3fB45g/6 )yO3y- delta wherein A1 indicates a monovalent metallic element, A2 indicates a divalent metallic element, A3 and B1 each indicate a trivalent metallic element, B2 indicates a tetravalent metallic element, B3 indicates a pentavalent metallic element, B4 indicates a hexavalent metallic element, delta indicates a defect amount, and a, b, c, d, e, f, g, x and y satisfy the following relations: <MATH> <MATH> <MATH> <MATH> <MATH> <MATH></p> |
