Patent ID: 6685850
Filing Date: 2004-02-03
Classification: C04B,H01L

Abstract:
A piezoelectric ceramic material comprising a solid solution comprising Bi, Ti, M and Nb as main component elements, wherein M represents at least one element selected from the group consisting of Sr, Ba and Ca, wherein the molar ratio as oxides of said main component elements is given (Bi3âˆ’xMx)z(Nb1+yTi1âˆ’y)O9 provided that 0B&lE;0.5 and 0&lE;xC&lE;0.4, wherein the molar ratio of Ba/(M+Bi) is given by xB/3 and a molar ratio of Ca/(M+Bi) is given by xC/3, wherein said solution further includes a bismuth layer compound selected from the group consisting of Bi3TiNbO9 crystal, MBi2Nb2O9 crystal and mixtures thereof.