Patent ID: 6387225
Filing Date: 2002-05-14
Classification: B41J,C04B,H01L

Abstract:
A process for the preparation of a thin piezoeletric film element comprising a thin PZT film formed on a substrate comprising:a first step of forming a metal film on a substrate; a second step of sputtering a PZT precursor onto said metal film in an atmosphere free of oxygen; and a step of heat-treating said precursor film to form a PZT crystal; wherein the composition of the PZT target in said second step is composed of PbZrO3, PbTiO3 and Pb(AgBh)O3 which satisfy the following relationships: a+b+c=1, 0.10&lE;a&lE;0.55, 0.25&lE;b&lE;0.55, 0&lE;c&lE;0.5, supposing PbZrO3: PbTiO3: Pb(AgBh)O3=a:b:c (molar ratio) wherein A represents a divalent metal selected from the group consisting of Mg, Co, Zn, Cd, Mn and Ni or a trivalent metal selected from the group consisting of Y, Fe, Sc, Yb, Lu, In and Cr; and B represents a pentavalent metal selected from the group consisting of Nb, Ta and Sb or a hexavalent metal selected from the group consisting of W and Te, with the proviso that if A is a trivalent metal and B is not a hexavalent metal or if A is a divalent metal and B is a pentavalent metal, g is &frac13; and h is &frac23;.