PRODUCTION OF PIEZOELECTRIC SINGLE CRYSTAL

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a piezoelectric single crystal having an excellent electromechanical coupling coefficient by preventing the change of a composition. SOLUTION: A solid body of lead oxide, and a sintered body 5 of a raw material for a piezoelectric single crystal are separately stored in a crucible 1, and the caliber [(r) mm] of the crucible 1 and the height [(h) mm] of a molten liquid are regulated so as to satisfy the formulas 3<=(h)<=200 and 0.03 <=(h)/(r)<=10 when the molten liquid 4 is formed by melting the solid body of the lead oxide, when producing the piezoelectric single crystal 3 consisting of a perovskite type complex oxide by forming a local temperature gradient by a heater 6 to heat the crucible 1, and moving the crucible 1 to provide the piezoelectric single crystal 3 consisting of the perovskite type complex oxide.