Piezoelectric ceramics

H - Electricity – 01 – L

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H01L 41/187 (2006.01) C04B 35/491 (2006.01)

Patent

CA 2134919

A piezoelectric ceramic is provided which comprises a perovskite-based solid solution represented by the formula: Pb1-aMa((Ni1-bZnb)1/3Nb2/3}xTiyZrzO3 wherein M represents Ba or Sr and x + y + z = 1, the perovskite-based solid solution having, added thereto, La2O3 or Nd2O3, as a metallic oxide of Group A and NiO, Fe2O3, SnO2 or Ta2O5 as a metallic oxide of Group B. The piezoelectric ceramic of the present invention exhibits large value of piezoelectric constant d and high Curie point, so that it is useful as a material of a piezoelectric actuator.

Céramique piézoélectrique renfermant une solution solide à base de perovskite, représentée par la formule Pb1-aMa((Ni1-bZnb)1/3Nb2/3}xTiyZrzO3 où M représente Ba ou Sr, avec x + y + z = 1; la solution solide à base de perovskite comporte en plus La2O3 ou Nd2O3, en tant qu'oxyde métallique du Groupe A, ainsi que NiO, Fe2O3, SnO2 ou Ta2O5, en tant qu'oxyde métallique du Groupe B. La céramique piézoélectrique de la présente invention possède une constante piézoélectrique et un point de Curie élevés, ce qui en fait un produit utile comme matériau d'un actionneur piézoélectrique.

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