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Method of growing near chemical gauge ratio lithium niobate monocrystal using crucible lowering method

A near stoichiometric ratio and crucible descending method, applied in the field of near stoichiometric ratio lithium niobate single crystal preparation, can solve the problems of unstable quality, complicated equipment and high cost, achieve good repeatability and consistency, avoid Hypoxia, simple effect of growth equipment

Inactive Publication Date: 2005-08-24
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the invention is to overcome the shortcomings of complex equipment, unstable quality, small size and high cost in the method for growing near-stoichiometric lithium niobate single crystal materials in the prior art, and propose a crucible-down method for growing near-stoichiometric niobium niobate Lithium Oxide Single Crystal Method

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  • Method of growing near chemical gauge ratio lithium niobate monocrystal using crucible lowering method
  • Method of growing near chemical gauge ratio lithium niobate monocrystal using crucible lowering method
  • Method of growing near chemical gauge ratio lithium niobate monocrystal using crucible lowering method

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specific Embodiment

[0024] Using the above-mentioned crucible descent method, resistance heating temperature gradient furnace and specific process flow to carry out near-stoichiometric LN single crystal growth specific examples are as follows:

[0025] [001] oriented seed crystals are placed in the seed crystal tank 9 of the crucible 1 made of platinum (Pt) gold. Select LN raw material and co-solvent Li 2 The group distribution ratio of O, according to [Li 2 CO 3 ] / [Nb 2 o 5 ]=58:42 proportioning, mix evenly, directly pack in the crucible 1 after briquetting with a press machine, add the crucible cover 10, place in the electric resistance furnace. Heating and heating until the melt temperature is about 1180°C, the molten LN polycrystalline material becomes a saturated solution, and the temperature is kept constant for 2 to 6 hours. Lower the crucible at a rate of 0.2mm / h to grow crystals, and an appropriate lowering rate is conducive to the complete crystallization. After crystallization is...

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Abstract

A process for growing the lithium niobate monocrystal with near stoichiometric ratio by crucible lowering method includes putting orientational seed crystal in crucible, proportionally mixing Li2CO3 with Nb2O5, die pressing, putting it in said crucible, closing its cover, heating to 1160-1200 deg.C in resistance furnace to smelt and holding the temp for 2-6 hr, lowering the crucible at 0.1-1 mm / hr of speed to grow crystal, and cooling. Its advantages are simple equipment, large size and low cost.

Description

technical field [0001] The present invention and lithium niobate (LiNbO 3 , referred to as LN) single crystal, relates to a method for preparing a near-stoichiometric lithium niobate single crystal, more specifically, a method for growing a near-stoichiometric lithium niobate single crystal material by a crucible descent method. Background technique [0002] LN crystals are piezoelectric, ferroelectric and electro-optic crystals with a wide range of applications. At present, commercial crystals are obtained from LiNbO with the same composition ratio by the pulling method. 3 Although the crystal grown by this method has good optical quality and consistency, it is a typical non-stoichiometric crystal, because the [Li] / [Nb] in the crystal is about 48.6 / 51.4, severe Li deficiency, forming a large number of intrinsic defects in the crystal, which has many adverse effects on the performance of LN, limiting the application of this crystal. The near-stoichiometric LN crystal has...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B11/00C30B15/00C30B29/30
Inventor 徐军王海丽周圣明张连翰杭寅周国清赵广军司继良
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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