Method for simply and efficiently removing blue in potassium niobate crystal

A high-efficiency technology of potassium niobate, applied in chemical instruments and methods, niobium compounds, inorganic chemistry, etc., can solve the problems of occupation and long time, and achieve the effect of short sintering temperature, short time and saving synthesis time.

Inactive Publication Date: 2010-07-07
FUJIAN CASTECH CRYSTALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

He solved the blue problem by heating at 1200°C for 15 days. This solution has the characteristics of long time and occupied crucible.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Embodiment 1: A certain amount of potassium carbonate and niobium oxide is weighed to meet the excess of K to Nb by 2% to 10% (mole percentage), and mixed in a raw material bucket. Melt the mixed amount in a silicon carbide rod furnace at 1150°C until the reaction is complete. Place the melted material in a platinum crucible in a silicon-molybdenum furnace and heat it to 1300°C, keep it warm for 24 hours, cool down to 200-300°C, take it out and put it in a molten salt furnace for growth. The grown potassium niobate crystals have no blue color.

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PUM

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Abstract

The invention discloses a method for simply and efficiently removing blue in potassium niobate crystal. The invention has the core content that potassium carbonate and niobium oxide serve as raw materials, K is 2-10% (molar percent) more than Nb; fusion reaction is carried out at the temperature of 1150 DEG C, the temperature of 1300 DEG C is kept for 24 hours, and the mixture is taken out after the temperature is cooled to 200-300 DEG C to be put into a salt melting furnace for trail crystal growth. The invention solves the problem that a few of potassium niobate crystals are blue at initial growth. The invention has the characteristics of short reaction time, simple operation and the like.

Description

technical field [0001] The invention relates to the field of nonlinear optical crystals, in particular to a method for growing potassium niobate crystals technical background [0002] KN's nonlinear optical quality factor, electro-optical quality factor, photorefractive quality factor and piezoelectric properties are among the best in nonlinear crystals and piezoelectric crystals. The second harmonic generation performance index M is large, approximately equal to 30 (slightly lower than 4 times of KTP), and it is one of the materials with the largest performance index among inorganic compounds, which may realize high-efficiency second harmonic generation. Use b-axis for Nd:YAG laser and a-axis for 850-940nm band, which can realize non-critical phase matching separately. The crystal has stable chemical properties, is easy to process, and has better laser damage resistance than LiNbO3. [0003] This crystal was once considered to be the most difficult crystal to grow, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G33/00
Inventor 不公告发明人
Owner FUJIAN CASTECH CRYSTALS
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