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Method for growing a BaAlBO3F2 crystal by fusing agent

A growth method and crystal growth technology, applied in the directions of crystal growth, single crystal growth, single crystal growth, etc., can solve the problems of high volatility of the system, high growth temperature, high solution viscosity, etc., to achieve high solubility and reduce crystal growth temperature. , the effect of reducing volatility

Inactive Publication Date: 2009-08-26
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the disadvantages of high growth temperature, high system volatility, high solution viscosity and low solubility in the prior art to grow BABF crystals, thereby providing a solution that can grow at a lower temperature, has low system volatility, and Nonlinear Optical Crystal BaAlBO with Low Viscosity and High Solubility 3 f 2 Advanced flux growth method, the cracking phenomenon of the grown crystal is greatly reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1, adopt B 2 o 3 -LiF-NaF flux system to prepare BABF crystals:

[0031] BaAlBO 3 f 2 powder and analytically pure grade H 3 BO 3 , LiF, NaF as raw materials, molar ratio BaAlBO 3 f 2 :H 3 BO 3 : LiF: NaF = 1: 0.8: 2: 0.25 ingredients, weigh 410.0 grams of BaAlBO 3 f 2 Powder, 77.83 g H 3 BO 3 , 81.65 grams of LiF, 16.53 grams of NaF, that is, the molar ratio BaAlBO in the growth system 3 f 2 :B 2 o 3 : LiF: NaF = 1: 0.4: 2: 0.25. Grind and mix the weighed raw materials evenly, and put them into φ85×75mm 3 In the platinum crucible, it is first melted in a muffle furnace at 1000 ° C, cooled and then placed in a single crystal growth furnace heated by resistance wires, and the top opening of the furnace is sealed with a cover made of insulating material, and the center of the cover corresponds to the center of the crucible Leave a small hole for the seed rod to enter and exit, and quickly raise the temperature to 940°C to completely melt the ab...

Embodiment 2

[0032] Embodiment 2, adopt B 2 o 3 -LiF-NaF flux system to prepare BABF crystals:

[0033] BaAlBO 3 f 2 powder and analytically pure grade H 3 BO 3 , LiF, NaF as raw materials, molar ratio BaAlBO 3 f 2:H 3 BO 3 : LiF: NaF = 1: 1: 2.2: 0.4 ingredients, weigh 410.0 grams of BaAlBO 3 f 2 Powder, 97.28 g H 3 BO 3 , 89.82 grams of LiF, 26.45 grams of NaF, that is, the molar ratio of BaAlBO in the growth system 3 f 2 :B 2 o 3 : LiF: NaF = 1: 0.5: 2.2: 0.4. After grinding and mixing the weighed raw materials, put them into φ85×75mm 3 The platinum crucible is melted in a muffle furnace at 1030°C, cooled and placed in a single crystal growth furnace heated by resistance wires, and the opening of the furnace top is sealed with a cover made of insulating material, and the center of the cover corresponds to the center of the crucible Leave a small hole for the seed rod to enter and exit, and quickly heat up to 960°C to completely melt the above-mentioned crucible material...

Embodiment 3

[0034] Embodiment 3, adopt B 2 o 3 -LiF-NaF flux system to prepare BABF crystals:

[0035] BaAlBO 3 f 2 powder and analytically pure grade H 3 BO 3 , LiF, NaF as raw materials, molar ratio BaAlBO 3 f 2 :H 3 BO 3 : LiF: NaF = 1: 1.4: 1.8: 0.5 ingredients, weigh 522.2 grams of BaAlBO 3 f 2 Powder, 173.12 g H 3 BO 3 , 93.38 grams of LiF, 42.0 grams of NaF, that is, the molar ratio of BaAlBO in the growth system 3 f 2 :B 2 o 3 : LiF: NaF = 1: 0.7: 1.8: 0.5. After grinding and mixing the weighed raw materials evenly, put them into φ90×80mm 3 In the platinum crucible, first melt it in a muffle furnace at 1050°C, then put it into a single crystal growth furnace heated by resistance wire after cooling, and seal the top opening of the furnace with a cover made of insulating material, and the center of the cover corresponds to the center of the crucible Leave a small hole for the entry and exit of the seed crystal rod, quickly raise the temperature to 1000°C, and keep t...

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Abstract

The invention relates to a method for growing a BaAlBO3F2 crystal by a fusing agent, which comprises the following steps: evenly mixing BaAlBO3F2, B2O3, LiF and NaF in a molar ratio of 1:0.2-1:1.5-3:0.2-0.6, and obtaining a crystal growing raw material after fusion and cooling; placing the raw material into a growing furnace, and heating and fusing the raw material; introducing a seed crystal 5 to 15 mm below the liquid level at a temperature of between 1 and 5 DEG C higher than a saturation temperature, keeping a constant temperature for 10 to 60 minutes, and reducing the temperature to a saturation point temperature; reducing the temperature at a speed of 0.2 to 5 DEG C / day, and simultaneously rotating the crystal; and after the crystal grows to the required size, extracting the crystal, and reducing the temperature to room temperature to obtain the BaAlBO3F2 crystal. The method uses a B2O3-LiF-NaF fusing agent system, and can reduce crystal growing temperature, high temperature solution viscosity and systemic volatility, solve the problems of bottom crystallization in the crystal growing process, easy cracking of the growing crystal, and the like, and obtain large-size and high-quality BABF crystal stably.

Description

technical field [0001] The invention relates to a single crystal growth method, in particular to nonlinear optical crystal BaAlBO 3 f 2 flux growth method. Background technique [0002] BaAlBO 3 f 2 Crystal (BABF crystal) is a new type of nonlinear optical crystal. Its stable physical and chemical properties and excellent nonlinear optical properties make it have a good application prospect. At the earliest, the Japanese Journal of Applied Physics [Jpn.J.Appl.Phys.Vol.41(2002)pp.L1131-L1133] reported the crystal structure of BABF. The crystal belongs to the hexagonal system, the space group is P6, and it is a uniaxial crystal, and its unit cell parameter a=4.8879(6) c=9.403(1) Each unit cell contains 2 BaAlBO 3 f 2 chemical formula. "Journal of Crystal Growth" [J.Crystal Growth 260(2004) 287-290] in the United States, "Journal of Silicates" [2005, 33(8): 954-958] and "Journal of Synthetic Crystals" [2006, 35(1):6-10] have reported the growth of BABF crystals. H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B9/12C30B11/00C30B29/10
Inventor 胡章贵岳银超
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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