Patent ID: 7279823

Claim:
A piezoelectric actuator characterized in comprising: a diaphragm that is constituted by yttria-stabilized zirconia, CeO 2 , or ZrO 2 , that is grown epitaxially on a (100) orientation Si substrate in a cubic (100) orientation having a fluorite structure; a buffer layer formed on said diaphragm and constituted by tetragonal or orthorhombic (001) orientation REBa 2 Cu 3 O x having a layered perovskite structure (RE=La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y); a bottom electrode formed on said buffer layer and constituted by pseudo-cubic (100) orientation strontium ruthenate having a perovskite structure; a piezoelectric layer formed on said bottom electrode and having a rhombohedral (100) orientation perovskite structure; and a top electrode formed on said piezoelectric layer.