PIEZOELECTRIC SINGLE CRYSTAL, PIEZOELECTRIC SINGLE CRYSTAL ELEMENT AND METHOD FOR PREPARATION THEREOF

摘要

An inexpensive piezoelectric single-crystal device being excellent in the piezoelectric characteristics and having a complex perovskite structure can be provided by adding a specific additive to a lead magnesium niobate-lead titanate (PMN-PT) single crystal or a lead zinc niobate-lead titanate (PZN-PT or PZNT) single crystal. Specifically, the piezoelectric single crystal has a complex perovskite structure and is formed of a composition containing 35 to 98 mol% lead magnesium niobate [Pb(Mg 1/3 Nb 2/3 )O 3 ] or lead zinc niobate [Pb(Zn 1/3 Nb 2/3 )O 3 ], 0.1 to 64.9 mol% lead titanate [PbTiO 3 ], and 0.05 to 30 mol% lead indium niobate [Pb(In 1/2 Nb 1/2 )O 3 ] wherein calcium is substituted for 0.05 to 10 mol% lead in the composition.