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

摘要

It has been found that the addition of a specific additive to lead magnesium niobate-titanate (PMN-PT) single crystal or lead zinc niobate-titanate (PMN-PT or PZNT) single crystal can provide a piezoelectric single crystal element or the like having a composite perovskite structure which is excellent in piezoelectric characteristics and is non-expensive. Specifically, provided is a single crystal which has a composite perovskite structure and is a composition comprising 35 to 98 mol % of lead magnesium niobate [Pb(Mg1/3 Nb2/3)O3] or lead zinc niobate [Pb(Zn1/3Nb 2/3)O3], 0.1 to 64.9 mol % of lead titanate [PbTiO3 ] and 0.05 to 30 mol % of lead indium niobate [Pb(In1/2Nb 1/2)O3], characterized in that 0.05 to 10 mol % of lead in said composition is substituted with calcium.