Patent ID: 7494601

Claim:
A piezoelectric ceramic composition represented by the following formula: (Na 0.475 K 0.475 Li 0.05 )(Nb 1-x A x )O 3 +yCeO 2 +zBO 2 ; wherein “A” represents Sb or Sb+Ta, “B” represents a tetravalent transition metal, 0≦x≦0.2, 0.2 wt %<y<1.2 wt %, and 0.4 wt %≦z≦0.6 wt %, said weight percentage y and z are calculated based on the weight of said compound (Na 0.475 K 0.475 Li 0.05 )(Nb 1-x A x )O 3 .