Patent ID: 8889030

Claim:
A ternary piezoelectric polycrystalline material comprising: a lead hafnium titanate containing ceramic having a formula of Pb 1-x M x [{M I 2+ } 1/3 {M II 5+ } 2/3 ] 1-y-z Hf z Ti y O 3 , where: M is at least one of Ba 2+ , Ca 2+ , Sr 2+ and La 3+ ; M I 2+ is at least one of Mg 2+ , Ni 2+ and Zn 2+ ; M II 5+ is at least one of Nb 5+ , Sb 5+ and Ta 5+ ; x is greater than 0.0 and less than 0.2; y is greater than 0.2 and less than 0.8; and z is greater than 0.2 and less than 0.8.