PRODUCTION OF SOLID SOLUTION SINGLE CRYSTAL BY FLOATING ZONE MELTING METHOD

摘要

PURPOSE:To produce a solid solution single crystal having uniform composition and free from crack by the floating zone melting method, by carrying out the growing of a solid solution single crystal using a sintered material having low void ratio as the raw material to be supplied to the floating zone melting furnace, and regulating the rate of growth within a specific range. CONSTITUTION:Powdery raw materials necessary for the production of a solid solution single crystal such as barium calcium titanate, etc. are weighed, mixed, calcined, pulverized, pressed, formed and sintered to obtain a sintered material having a void ratio of 5%. The sintered material 2 and a seed crystal 3 are set to the definite position in a floating zone melting furnace furnished with a halogen lamp 5 as a heat source, and heated until the temperature of the hottest part of the sintered material 2 and the seed crystal 3 reaches the melting point. A floating molten zone is formed by this process. The objective solid solution single crystal is grown at a growth rate of 10-50mm./h under rotating the seed crystal 3 and the sintered material 2.