| 摘要 |
PROBLEM TO BE SOLVED: To obtain a crystal composition capable of sharply decreasing inclusion materials, foam and crack which are liable to be produced when growing a crystal without deteriorating the characteristics of a solid solution-based piezoelectric single crystal represented by the formula (Bi1/2, Na1/2)1-xAlx}TiO3, or the like, and readily providing the large-sized crystal. SOLUTION: This oxide single crystal composition comprises a compound comprising at least one kind of pentavalent element D (D=Nb or Ta) in the range represented by the formula 0<D<5 mol.%, in a piezoelectric single crystal composed of a complex perovskite oxide represented by the general formula (1) (Bi1/2, Na1/2)1-xAlx}TiO3 (0<=x<1; Al is at least one kind selected from Ba, Ca and Sr).
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