Fluxing agent growing method of K2Al2B2O7 crystal

Abstract

The invention relates to a fluxing agent growing method of K2Al2B2O7 crystal. The method comprises the following steps: mixing K2Al2B2O7 with fluxing agent in a molar ratio of 1:1.4-2.2, placing the mixture in a 950-1050 DEG C of muffle furnace to melt, cooling at room temperature to obtain growing raw material; then placing in an electric stove wire heating crystal growing furnace to heat and obtain a high temperature solution; introducing seed crystal under 2-10 DEG C above saturation temperature; cooling by using the saturation point temperature as the cooling starting point while rotating the crystal, wherein the vertical temperature gradient of the high temperature solution is 0.05-1 DEG C/cm; lifting the crystal, which grows to the required size, from the level surface to cool to the room temperature and obtain K2Al2B2O7 crystal, wherein the fluxing agent is M'F, M''F or M'F+M''F, M' is Li, Na or K, and M'' is Ca or Ba. The method of the invention has low growing temperature and the growing system has low volatility and viscosity so that solute can be conveniently transported and high optical quality K2Al2B2O7 crystal without inclusion and optical path can be grown.

Description

technical field [0001] The present invention relates to a kind of growth method of single crystal, specifically make and relate to K 2 Al 2 B 2 o 7 Flux growth method for nonlinear optical crystals. Background technique [0002] K 2 Al 2 B 2 o 7 The compound was first synthesized by Kaduk [Power Diffraction File Set.46-582], and its single phase was proved by X-ray diffraction method, but no detailed structure was given, and its properties were not clear. In 1998, Chinese and Japanese scientists [Ye Ning, Zeng wenrong, Wu baichang, Chen Chuangtian, "Two new nonlinear optical crystals: BaAl 2 B 2 o 7 and K 2 Al 2 B 2 o 7 ", SPIE Vol.3556, 21-23; Zhanggui Hu, Y. Mori, T. Higashiyama, et al., "K 2 Al 2 B 2 o 7 -A Newnonlinear optical crystal”, SPIE Vol.3556, 156-161] also reported K 2 Al 2 B 2 o 7 (KABO for short) is an excellent nonlinear optical material, and its structure was analyzed by growing KABO single crystal. The space group of KABO is P321, wh...

AI Technical Summary

Problems solved by technology

Other fluxes (such as MoO 3 ), the viscosity of the system increases, the melt flows slowly, which affects the transmission of the solute, and the flux is easily brought into the crystal during growth, resulting in the formation of inclusions, which seriously affects the quality of the crystal

In addition, due to the high temperature, the saturation point temperature is 950-1000°C, so the volatilization is serious, and there are white needles around the seed rod and the furnace mouth, which is not conducive to the growth of KABO