METHOD FOR GROWING LiNbO3 SINGLE CRYSTAL

摘要

PROBLEM TO BE SOLVED: To provide a method for growing a high quality LiNbO₃ single crystal without controlling the shape of the single crystal using an iridium crucible.;SOLUTION: The method for growing a LiNbO₃ single crystal comprises: charging a LiNbO₃ seed crystal 7 into a lower portion of an iridium crucible 1 and charging a LiNbO₃ crystal raw material 8 on the LiNbO₃ seed crystal; and growing the LiNbO₃ single crystal by the vertical Bridgman method without controlling the shape of the single crystal or a vertical temperature gradient freezing method in an inert gas atmosphere in which an oxygen concentration in a growth furnace housing the iridium crucible 1 is set to 5% or less. The method has the effect of growing a high quality LiNbO₃ single crystal even when applying an inexpensive iridium crucible as compared with a platinum crucible.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2018,JPO&INPIT