Crystal pulling growth device

A growth device and crystal technology, applied in the direction of crystal growth, single crystal growth, single crystal growth, etc., can solve the problems of thermal distribution asymmetry, crystal quality influence, strict equipment requirements, etc., to reduce the probability of seed crystal fracture, improve Good crystal growth quality and thermal distribution symmetry

Inactive Publication Date: 2019-12-27
FUZHOU PHOTOP QPTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the KTN crystal is a perovskite crystal continuous solid solution system, it is impossible to use the traditional pulling method for crystal growth
In the prior art, the relatively advanced KTN crystal growth process successfully grows high-quality KTN crystals at lower temperatures (below 1200°C) by using the molten salt method and the molten salt extraction method; however, these two The disadvantages of the method are also obvious, for example, the growth cycle is too long, up to about 30 days, there are also problems such as large solvent volatilization, corrosion of quartz and refractory materials, and it is difficult to repeatedly grow large-sized KTN crystals, and the requirements for equipment

Method used

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Effect test

Embodiment 1

[0032] Such as figure 1 As shown, the crystal pulling growth device of the present invention is applied to contain polycrystalline melts to grow rectangular crystals 2 by pulling method, and it includes a main body 1 made of platinum material, and the main body 1 is provided with a multi- The stirring chamber 11 of the crystal melt, the cross section of the stirring chamber 11 is circular, and one side of the stirring chamber 11 is connected with a growth chamber 12 with a rectangular cross section, and the polycrystalline melt in the stirring chamber 11 is controlled by an external The platinum stirring rod 31 is rotated and stirred to drive the polycrystalline melt in the growth chamber 12 to form a rectangular circulation for growing the rectangular crystal 2 by the pulling method.

[0033] The crystal pulling growth device of the present invention is applied to a polycrystalline melt to carry out a method for growing a KTN crystal by a pulling method comprising the followi...

Embodiment 2

[0040] Such as figure 2 As shown, on the basis of the structure of the crystal pulling growth device described in Example 1, when an automatic feeding device 33 is provided in the muffle furnace, it is also possible to prepare KTN polycrystalline feedstock for feeding;

[0041] The preparation method of KTN polycrystalline supplementary material is as follows: according to the molar ratio of 1.02:0.37:0.63, weigh the raw material K 2 CO 3 , Nb 2 o 5 and Ta 2 o 5 Grind in a mortar and mix well, then use 10 8 Pa is pressurized to make block raw materials, and then put the block raw materials in a traditional platinum crucible, put them into the heating chamber of the muffle furnace, and slowly raise the temperature to 1100 °C at a heating rate of 5-60 °C / h, and keep the temperature for 48 hours. Get KTN polycrystalline feed;

[0042] The present invention adopts the above technical scheme, during the crystal growth period, the KTN polycrystalline feed material is quantit...

Embodiment 3

[0044] Such as image 3 As shown, on the basis of the structure of the crystal pulling and growing device described in Embodiment 2, a feeding chamber 13 for feeding polycrystalline melt is connected to the other side of the stirring chamber 11 .

[0045] Preferably, the cross section of the feeding chamber 13 is rectangular or circular.

[0046] The present invention adopts the above technical scheme, which can overcome the requirement of fast melting speed of feeding materials directly into the stirring chamber 11, and reduces the technical difficulty of feeding materials. When the muffle furnace is provided with an automatic feeding device 33, it is also possible to prepare the KTN polycrystalline feed material according to the preparation method described in embodiment 2, and during crystal growth, the KTN polycrystalline feed material is fed from the KTN polycrystalline feed device 33 by the automatic feeding device 33. The upper part is quantitatively fed into the feedi...

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Abstract

The invention relates to a crystal pulling growth device. The device is used for containing polycrystalline melt so as to grow rectangular crystals through a pulling method. The device comprises a main body made of a platinum material, wherein a stirring cavity for stirring a polycrystalline melt is formed in the main body; the cross section of the stirring cavity is round in shape, wherein one side of the stirring cavity is communicated with a growth cavity with a rectangular cross section, and the polycrystalline melt in the stirring cavity is rotationally stirred by an external platinum stirring rod so as to drive the polycrystalline melt in the growth cavity to form rectangular circulation for growing rectangular crystals by a pulling growth method. The invention has the advantages ofreasonable design, good heat distribution symmetry and good crystal growth quality, and is beneficial to the growth of large-size crystals.

Description

technical field [0001] The invention relates to the technical field of crystal growth equipment, in particular to a crystal pulling growth device. Background technique [0002] Potassium tantalum niobate (KTa 1-x Nb x o 3 , referred to as KTN) crystal is potassium niobate (KNbO 3 , referred to as KN) and potassium tantalate (KTaO 3 , referred to as KT), is the crystal with the largest secondary electro-optic effect discovered so far, and it is also one of the earliest crystals with photorefractive properties; like KT and KN crystals, KTN The crystals have a perovskite structure. At room temperature, KTN crystals can exist in both paraelectric phase (cubic phase m3m) and ferroelectric phase (tetragonal phase 4mm or orthorhombic phase mm2) depending on the composition. In the KTN ferroelectric phase, the linear electro-optic effect can be used to realize holographic storage, and in the paraelectric phase, the secondary electro-optic effect can also be used to achieve thi...

Claims

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Application Information

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IPC IPC(8): C30B15/30C30B29/30
CPCC30B15/305C30B29/30
Inventor 吴砺陈燕平卢秀爱陈卫民林磊
Owner FUZHOU PHOTOP QPTICS CO LTD
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