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Method for growing yttrium iron garnet crystals by adopting composite fluxing agent

A technology of yttrium iron garnet and flux, which is applied in the direction of melt, single crystal growth, crystal growth, etc. problems, to reduce the difficulty of growth and energy costs, promote the development of industrialization, and promote growth and growth.

Inactive Publication Date: 2021-01-26
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the purpose of the present invention is to address the deficiencies in the prior art, to provide a lead-free method for growing yttrium-iron garnet crystals using a composite flux, which solves the problems of environmental pollution in the existing growth process and the relatively low melting point of the crystals. Problems of height and bottlenecks that make it difficult to grow large-sized bulk Ythron-iron garnets

Method used

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  • Method for growing yttrium iron garnet crystals by adopting composite fluxing agent

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Embodiment 1

[0023] A method for growing yttrium iron garnet crystals using a composite flux, comprising the following steps:

[0024] (1) Preparation of raw materials: The raw materials used in the experiment are Y with a purity ≥ 99.99% 2 o 3 and Fe 2 o 3 , according to Y 3 Fe 5 o 12 The chemical formula is weighed according to the molar ratio of Y:Fe:O=3:5:12. The weighed raw materials were added into the agate mortar and thoroughly ground for 4 hours to obtain mixed raw materials;

[0025] (2) Preparation of polycrystalline material: put the mixed raw material into a crucible, put it into a muffle furnace, and pre-fire it at 1050 °C for 16 hours to obtain a polycrystalline material of yttrium iron garnet, and crush the polycrystalline material , join Bi 2 o 3 and B 2 o 3 The main composite flux, the flux raw material purity is 99.99%, accounting for 60% of the mixed material, and the mixed material is fully ball milled for 6 hours to obtain a polycrystalline material; figur...

Embodiment 2

[0031] A method for growing yttrium iron garnet crystals using a composite flux, comprising the following steps:

[0032] (1) Preparation of raw materials: The raw materials used in the experiment are Y with a purity ≥ 99.99% 2 o 3 and Fe 2 o 3 , according to Y 3 Fe 5 o 12 The chemical formula is weighed according to the molar ratio of Y:Fe:O=3:5:12. The weighed raw materials were added into an agate mortar and thoroughly ground for 5 hours to obtain mixed raw materials;

[0033] (2) Preparation of polycrystalline material: put the mixed raw material into a crucible, put it into a muffle furnace, and pre-fire it at 1400°C for 10 hours to obtain a polycrystalline material of yttrium iron garnet, which is crushed. Join Bi 2 o 3 and B 2 o 3 The main composite flux, the flux raw material purity is 99.99%, accounting for 50% of the mixed material, and the mixed material is fully ball milled for 6 hours to obtain a polycrystalline material;

[0034] (3) Treatment of seed...

Embodiment 3

[0039] A method for growing yttrium iron garnet crystals using a composite flux, comprising the following steps:

[0040] (1) Preparation of raw materials: The raw materials used in the experiment are Y with a purity ≥ 99.99% 2 o 3 and Fe 2 o 3 , according to Y 3 Fe 5 o 12 The chemical formula is weighed according to the molar ratio of Y:Fe:O=3:5:12. The weighed raw materials were added into the agate mortar and thoroughly ground for 4.5 hours to obtain mixed raw materials;

[0041] (2) Preparation of polycrystalline material: put the mixed raw material into a crucible, put it into a muffle furnace, and pre-fire it at 1250°C for 12 hours to obtain a polycrystalline material of yttrium-iron garnet, and pulverize the polycrystalline material. Join Bi 2 o 3 and B 2 o 3 The main composite flux, the flux raw material purity is 99.99%, accounting for 60% of the mixed material, and the mixed material is fully ball milled for 6 hours to obtain a polycrystalline material;

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Abstract

The invention discloses a method for growing yttrium iron garnet crystals by adopting a composite fluxing agent. The yttrium iron garnet (Y3Fe5O12, YIG for short) crystal is an important magneto-optical material and is prepared by the following steps: accurately weighing, mixing, grinding and sintering raw materials to obtain a polycrystal material, crushing the polycrystal material, adding the composite fluxing agent, carrying out ball milling to obtain a mixed material, filling a crucible with the mixed material, heating the crucible filled with the material to a set temperature, keeping thematerial at the temperature to obtain high-temperature molten crystal solution, then carrying out slow cooling until the solution in the crucible is completely cooled and crystallized, conducting cooling to room temperature to obtain a crystal ingot, and removing the fluxing agent by adopting a mechanical stripping and chemical corrosion method to finally obtain the crystal. According to the invention, through the lead-free composite fluxing agent, environmental pollution caused by lead and the corrosion to a platinum crucible are greatly reduced, the growth temperature of the crystal is effectively reduced, and the bulk single crystal with a larger size can be obtained.

Description

technical field [0001] The invention relates to the technical field of crystal growth, in particular to a method for growing yttrium iron garnet crystals by using a composite flux. Background technique [0002] Yttrium iron garnet crystal is a functional material with excellent microwave, magneto-optical and magnetic garnet structure, with a theoretical density of 5.171g / cm 3 , showing a fully transparent state under infrared radiation, has been widely studied and applied to various optical devices, magneto-optical devices and microwave devices, and is a key material in the field of optical communication. Optical isolators made of yttrium iron garnet (YIG) can well solve the problem of interference of reflected light on optical fiber transmission, and have important applications in optical fiber communication and other fields. With the needs of the modern military and the rapid development of the information society, 5G communications, electronic countermeasures and other f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B9/12C30B29/28
CPCC30B9/12C30B29/28
Inventor 徐家跃房康南申慧周鼎
Owner SHANGHAI INST OF TECH
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