Patent ID: 7208041
Filing Date: 2007-04-24
Classification: C30B

Abstract:
1. A method for growing single crystals of perovskite oxides, comprising, adjoining a perovskite seed single crystal to a polycrystal of a perovskite oxide having an original composition, to provide an adjoined combination having an interface between the single crystal and the polycrystal, and then heating the adjoined combination; and, so as to make the seed single crystal grow into a polycrystal at the interface between the seed single crystal and the polycrystal and to repress secondary abnormal grain growths inside the polycrystal, 1) the composition ratio of the polycrystal being controlled and/or at least one specific component of the polycrystal being added in an excess amount compared to the amount of said specific component of said original composition of the polycrystal, and 2) said heat treatment being performed at a temperature which is over the primary abnormal grain growths completion temperature and below the secondary abnormal grain growths activation temperature, thereby, allowing the seed single crystal to grow continuously, and said heat treatment being carried out by adding at least one additive, which lowers the secondary abnormal grain growths activation temperature, to the interface between the single crystal and the polycrystal.