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A kind of preparation method of lithium niobate single crystal

A lithium niobate and single crystal technology, which is applied in the field of preparation of lithium niobate single crystal, can solve the problems such as the large difference in the stoichiometric ratio of niobium and lithium in lithium niobate crystal, and improve the electro-optic coefficient and nonlinear optical coefficient. , The effect of uniform composition and high purity

Active Publication Date: 2019-01-04
YANCHENG GENION ELECTRONICS MATERIALS FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stoichiometric ratio of niobium and lithium in lithium niobate crystals prepared by this method is quite different

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The present embodiment provides a kind of preparation method of lithium niobate single crystal, it comprises the following steps:

[0015] (a) Mix niobium oxide and lithium carbonate at a mass ratio of 79.1:20.9, add water and press into a block mixture (the quality of water does not affect the quality of the product, and can be selected according to personal experience or existing knowledge);

[0016] (b) adding the block mixture into the first heating furnace, raising the temperature of the heating furnace from room temperature to 1150°C at a rate of 8°C / min, and keeping the temperature for 1.5 hours to obtain the initial product;

[0017] (c) Put the initial product into the crucible, place it in the second heating furnace, adjust the seed rod to be concentric with the crucible, heat it to 1360°C to melt it, then cool down to 1330°C, and adjust the speed of the seed rod to 8 rpm, and drop the seed crystal at its lower end into the molten liquid to inoculate the seed ...

Embodiment 2

[0019] The present embodiment provides a kind of preparation method of lithium niobate single crystal, it comprises the following steps:

[0020] (a) niobium oxide and lithium carbonate are mixed in a mass ratio of 79.2: 20.8, and pressed into block mixture after adding water;

[0021] (b) adding the block mixture into the first heating furnace, raising the temperature of the heating furnace from room temperature to 1150 °C at a rate of 10 °C / min, and keeping the temperature for 2 hours to obtain the initial product;

[0022] (c) Put the initial product into the crucible, place it in the second heating furnace, adjust the seed rod to be concentric with the crucible, heat it to 1360°C to melt it, then cool down to 1350°C, and adjust the speed of the seed rod 15 revs / min, and lower the seed crystal at its lower end into the melt to inoculate the seed crystal, and when the diameter of the seed crystal expands to 30 mm, it is pulled up at a speed of 6 mm / hour to grow;

[0023] (d...

Embodiment 3

[0025] The present embodiment provides a kind of preparation method of lithium niobate single crystal, it comprises the following steps:

[0026] (a) niobium oxide and lithium carbonate are mixed in a mass ratio of 79.187: 20.813, and pressed into block mixture after adding water;

[0027] (b) adding the block mixture into the first heating furnace, raising the temperature of the heating furnace from room temperature to 1150 °C at a rate of 9 °C / min, and keeping the temperature for 1.8 hours to obtain the initial product;

[0028] (c) Put the initial product into the crucible, place it in the second heating furnace, adjust the seed rod to be concentric with the crucible, heat it to melt, then cool down to 1340°C, and adjust the speed of the seed rod to 10 rpm / minute, and drop the seed crystal at its lower end into the molten liquid to inoculate the seed crystal, and when the seed crystal diameter expands to 25mm, pull upwards with a speed of 5mm / hour to grow;

[0029] (d) t...

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PUM

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Abstract

The invention relates to a preparation method of lithium niobate single crystal. The method comprises the following steps: (a) mixing niobium oxides and lithium carbonate according to the mass ratio of 79.1-79.2:20.8-20.9, and pressing the mixture to be blocky mixture after adding water; (b) adding the blocky mixture into a first heating furnace, heating the heating furnace from the room temperature to 1150 DEG C at the speed of 8-10 DEG C / min, and maintaining the temperature for 1.5-2 hours to obtain the initial product; and (c) adding the initial product into a crucible placing in a second heating furnace, adjusting the seed crystal rod to make the seed rod be concentric with the crucible, heating the initial product to melt the initial product, cooling the product to 1330-1350 DEG C, adjusting the rotating speed of the seed crystal rod to 8-15 rpm, declining the seed crystal in the lower end of the seed crystal rod to the meltwater to inoculate the crystal, and lifting upward the product at the speed of 4-6 mm / h to perform growth when the diameter of the seed crystal is expanded to 20-30 mm. The near-stoichiometric lithium niobate crystal with high purity and uniform component can be prepared by means of controlling accurately the conditions such as raw material proportion, technology step, and heating mode.

Description

technical field [0001] The invention relates to the field of chemical crystals, and specifically relates to a method for preparing a lithium niobate single crystal. Background technique [0002] Lithium niobate crystal is a multifunctional material integrating piezoelectric, ferroelectric, pyroelectric, nonlinear, electro-optic, photoelastic, photorefractive and other properties. It has good thermal and chemical stability and can Large-sized crystals are grown by the pulling method, and are easy to process and low in cost. They are one of the few important functional materials that are enduring and continue to open up new fields of application. At present, it has been used in infrared detectors, laser modulators, optical communication modulators, optical switches, optical parametric oscillators, integrated optical components, high-frequency broadband filters, narrow-band filters, high-frequency high-temperature transducers, microacoustic devices, Laser frequency doublers, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B15/20C30B29/30
CPCC30B15/20C30B29/30
Inventor 徐国忠王斌仇如成
Owner YANCHENG GENION ELECTRONICS MATERIALS FACTORY