Patent ID: 7931821

Claim:
An oxynitride piezoelectric material comprising a tetragonal perovskite-type oxynitride represented by the following general formula (1): A 1−x Bi x+δ1 B 1−y B′ y+δ2 O 3−z N z (1) where A represents a divalent element, B and B′ each represent a tetravalent element, x represents a numerical value of 0.35 or more to 0.6 or less, y represents a numerical value of 0.35 or more to 0.6 or less, z represents a numerical value of 0.35 or more to 0.6 or less, and δ1 and δ2 each represent a numerical value of −0.2 or more to 0.2 or less.