SINGLE CRYSTAL GROWING UP METHOD OF SOLID SOLUTION COMPOSITION OF INORGANIC COMPOUND OXIDE

摘要

PURPOSE:To obtain easily a large single crystal in a process for growing single crystal by Bridgeman method and furnace temp. lowering method, by using a cylindrical crucible of a flat bottom, and changing the compsn. of sintered product to be charged in the crucible step wise. CONSTITUTION:A crucible with a flat bottom is used in a method by which a sintered product of solid solution composition of inorg. compound oxide is placed in the crucible and a single crystal is grown up by heating and melting. In the bottom of the crucible, a sintered product having an objective single-crystal composition is placed, and a sintered product having the composition contg. a larger amt. of an inorg. oxide having a larger specific gravity in the solid solution components than the objective single crystal composition is piled up thereon. Further, a temp gradient to make the temp. of the lower part of the sintered product in the crucible low, and the temp. of the upper part high is established to grow up the crystal by heating and melting. As described previously, it is possible to have the crucible the temp. gradient by bringing down the crucible into a furnace in which the similar temp. gradient is kept.