La XSi 6 O 1.5X+12 which is made the oxide monocrystal and

摘要

RE _XSi6O1.5X+12 (RE: La, Ce, PR, ND and Sm, x: 8 - 10) the oxide monocrystal which possesses constitution, in order for grain growth direction to become c axial direction, is grown making use of Czochralski method. Solidification ratio at the time of crystal rearing (weight of the weight throwing raw materials of rearing crystal) it makes under 45%.