Patent ID: 6773621
Filing Date: 2004-08-10
Classification: C04B,H01L

Abstract:
A piezoelectric ceramic material having the following molar composition:Pb(1+c)âˆ’xâˆ’(3/2a)âˆ’1/2(xÂ·b)A1xA2a(Zry(1âˆ’xÂ·bâˆ’xÂ·z)Ti(1âˆ’y)(1âˆ’xÂ·bâˆ’xÂ·w))(B1bB2zB3w)xO3, wherein A1 is selected from the group Ca, Mg, Sr, Ba, and a mixture of these elements; A2 is selected from the group of rare-earth elements and a mixture of these elements; B1 is selected from the group Nb, Ta, Sb, and a mixture of these elements; B2 is one of Cu and a mixture of Cu with at least one element selected from the group Zn, Ni, Co, and Fe; and B3 is Fe, where the following apply to values for a, b, c, x, y, z, and w:0.001&lE;a&lE;0.05 0.05&lE;b&lE;0.90 0&lE;c&lE;0.04 0.005&lE;x&lE;0.03 0.5&lE;y&lE;0.55 0.05&lE;z&lE;0.90 0&lE;w&lE;0.5.