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Method for preparing near-stoichiometric lithium tantalate crystals

A near-stoichiometric ratio, lithium tantalate technology, applied in chemical instruments and methods, crystal growth, single crystal growth, etc., can solve high equipment requirements, high production costs, difficult to obtain stoichiometric ratio lithium tantalate crystals, etc. problem, to achieve the effect of reducing cost and good uniformity

Inactive Publication Date: 2008-07-23
NINGXIA ORIENT TANTALUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the methods for growing SLT crystals are mainly double-crucible continuous feeding method, vapor phase transport (VTE) method, etc. The former has high requirements for equipment, complicated process and high production cost, while the latter can only prepare samples with a thickness of less than 1mm. It is difficult to obtain large-sized near-stoichiometric lithium tantalate crystals at the centimeter scale, which limits its industrial application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] raw material:

[0038] Li 2 CO 3 , Ta 2 o 5 and K 2 O.

[0039] making process:

[0040] According to the molar ratio Ta 2 o 5 : Li 2 CO 3 =51.25:48.75 ratio is made into base material.

[0041] In the base material, add K that accounts for 17mol% of the base material 2 O is used as a flux, and after fully grinding and mixing on a ball mill mixer for 12 hours, the particle size of the obtained powder is below 120 mesh.

[0042] The ground mixed powder was gradually heated to 800 °C for 4 hours at a constant temperature, CO 2 It is completely decomposed, and then calcined at 1300°C for 6 hours to form lithium tantalate polycrystalline material.

[0043] Compact the calcined polycrystalline material, put it in a platinum crucible, and gradually raise the temperature to 1520°C to completely melt the polycrystalline material, and keep it warm for 4 hours.

[0044] Use the pulling method to grow near-stoichiometric lithium tantalate crystals through the process...

Embodiment 2

[0048] raw material:

[0049] Li 2 CO 3 , Ta 2 o 5 , K 2 O and MgO.

[0050] making process:

[0051] According to the molar ratio Ta 2 o 5 : Li 2 CO 3 =51.25:48.75 ratio is made into base material.

[0052] In the above base material, add K that accounts for 15mol% of the base material 2 O is used as a flux, and 2 mol.% MgO in the base material is used as a dopant. In this embodiment, 2 mol.% ZnO in the base material can also be selected as a dopant. After fully grinding and mixing on a ball mill mixer for 12 hours, the obtained powder The particle size is below 120 mesh.

[0053] The ground mixed powder was gradually heated to 800 °C for 5 hours at a constant temperature, CO 2 It is completely released, and then calcined at 1300°C for 6 hours to form lithium tantalate polycrystalline material.

[0054] Compact the calcined polycrystalline material, put it in a platinum crucible, and gradually raise the temperature to 1520°C to completely melt the polycrystallin...

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Abstract

The invention discloses a preparation method for near-stoichiometric lithium tantalite crystal, which comprises the following steps: prepare the base material according to the molar ratio proportion of Li2CO3:Ta2O5=48-50:52-50; then add an alkali metal except Li2O as the flux; after grinding and mixing, heat to fully decompose and release CO2; calcine the mixture and get lithium tantalite polycrystalline charge; then press the polycrystalline charge, put in a crucible, heat to the fusion state, keep the temperature and then use the czochralski preparation method for the near-stoichiometric lithium tantalite crystal. The preparation method for near-stoichiometric lithium tantalite crystal has the advantages that: the process of preparing the near-stoichiometric lithium tantalite crystal is made simpler; the near-stoichiometric lithium tantalite crystal with bigger size and good uniformity is made easier to prepare; industrial mass production can be realized and the cost can be reduced.

Description

technical field [0001] The invention relates to a method for preparing lithium tantalate crystals, in particular to a method for preparing lithium tantalate crystals with a nearly stoichiometric ratio. Background technique [0002] Lithium tantalate (LiTaO 3 , referred to as LT) crystal is an excellent photoelectric material, which is widely used in the production of various functional devices. Currently commercially used is mainly the same composition lithium tantalate (Congruent LiTaO 3 , referred to as CLT, [Li] / [Ta]=48.75:51.25) crystal, because CLT has intrinsic defects such as lithium (Li) vacancies and tantalum (Ta) inversions, which seriously affect the performance of CLT, such as higher coercive field, relatively low resistance to photodamage threshold, etc. With the continuous increase of the Li / Ta ratio and gradually approaching the stoichiometric ratio ([Li] / [Ta]=1:1), many physical properties of lithium tantalate crystals are improved to varying degrees. For...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/30C30B15/00
Inventor 张学锋郭顺乔伟吕晋文卢巍代小磊侯俊峰黄旭刚张学信
Owner NINGXIA ORIENT TANTALUM IND
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