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Non-crucible growing method for magneto-optic rear earth ferrite crystal

A growth method, ferrite technology, applied in the direction of crystal growth, single crystal growth, single crystal growth, etc., can solve the problems of crucible corrosion environment, high growth temperature, easy occurrence of magnetoplumbite, etc., to achieve the elimination of crucible pollution, growth Simple preparation and convenient operation

Inactive Publication Date: 2008-09-03
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The presence of flux can reduce the growth temperature and change the crystallization characteristics of the crystal, but the crystal size obtained is small, the yield is low, and the second phase inclusions such as magnetoplumbite are prone to appear.
The hydrothermal method has also been used to grow the crystal, but the quality of the obtained crystal is not high, and the solvent ions easily enter the crystal and become impurity ions
So far, the various growth methods reported in the literature have not obtained high-quality crystals that can be used in practice.
[0005] In addition, since this series of crystals contains a large amount of iron ions and the growth temperature is relatively high, the volatilization of FeO and the reaction with the crucible will also bring many problems such as crucible corrosion and environmental pollution.

Method used

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  • Non-crucible growing method for magneto-optic rear earth ferrite crystal
  • Non-crucible growing method for magneto-optic rear earth ferrite crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Y with a molar ratio of 1:1 2 o 3 with Fe 2 o 3 After weighing and mechanically mixing evenly, pre-fire at 1000°C for 10h, press it into a rod shape under 250MP isostatic pressure, sinter in a muffle furnace at 1500°C for 24h, put it into a crucible-free single crystal growth furnace, and heat it with laser focus. Crystals were grown in an air atmosphere. Growth rate: 5mm / h, raw material rod rotation speed: 10rpm, seed crystal rotation speed: 10rpm. After the rod is completely crystallized, the temperature is slowly lowered, and the crystal is taken out. The crystal was annealed at 1000°C for 30 hours in an air atmosphere to obtain a crystal. After testing, the crystal structure was complete and it was pure YFeO 3 phase, there are no other impurity phases, and the crystal quality is good.

Embodiment 2

[0023] Y with a molar ratio of 1:1.08 2 o 3 with Fe 2 o 3 Weigh, mechanically mix evenly, pre-fire at 900°C for 15h, use 200MP isostatic pressing to form a primary rod with a diameter of 16mm, then sinter in a muffle furnace at 1600°C for 20h, and put it into a crucible-free single crystal growth furnace , using resistance heating, air atmosphere growth. The growth rate is 6 mm / h, the rotation speed of the rod is 5 rpm, and the rotation speed of the seed crystal is 15 rpm. After the crystal growth was completed, the temperature was slowly lowered to room temperature, and the crystal was taken out. The crystal was annealed at 1100°C for 36 hours in an air atmosphere to obtain high-quality YFeO without cracks 3 crystals.

Embodiment 3

[0025] Tm with a molar ratio of 1:1.05 2 o 3 with Fe 2 o 3 After weighing and mixing uniformly, pre-fire at 950°C for 10h, press it into a rod shape under 150MP isostatic pressure, sinter in a muffle furnace at 1500°C for 24h, put it into a single crystal growth furnace, and heat it with resistance. TmFeO grown in 3 crystals. The growth rate is 8mm / h, the rotation speed of the material rod and the seed crystal are both 10rpm, and the temperature is slowly cooled to room temperature after the material rod is completely crystallized to obtain TmFeO 3 crystals.

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Abstract

The invention relates to a crucibleless growing method for a magneto-optical crystal of rare earth ferrite, which belongs to single crystal growth filed. The invention has the characteristics that oxide is used for resource material and preburned according to proportion, a material rod is obtained through static pressure molding and high temperature sintering, and then the material rod is set into a crucibleless crystal growth furnace and is grown in air condition. The invention has the characteristics that a crucibleless technology is used for growing RFeO<3>crystal, and none complete fusion is needed, and pollution for the complete fusion and a copple in the growing process are utmostly decreased, impurity defect in a magneto-optical crystal is sharply decreased, and crystal quality is progressed.

Description

technical field [0001] The invention relates to a method for growing a magneto-optical rare earth ferrite crystal without a crucible, and belongs to the field of single crystal growth. technical background [0002] Magneto-optical materials refer to optical information functional materials with magneto-optic effects in the ultraviolet to infrared band. Y3Fe5O12 (YIG) with garnet structure is currently the most studied magneto-optic crystal, which can be made into optical devices such as magneto-optical switches, modulators, deflectors, sensors, etc., especially as Faraday rotor materials in isolators, and is widely used in Optical fiber communication and other fields. However, the Faraday rotation angle of the YIG crystal is small and the saturation magnetization is high, which is not conducive to the miniaturization of the device. [0003] In recent years, magneto-optical rare earth ferrite RFeO3 (R=Bi, Y, Ho, Er, Tb, Yb or other rare earth elements) crystals with a perov...

Claims

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Application Information

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IPC IPC(8): C30B29/24C30B13/00
Inventor 徐家跃申慧郁金星武安华
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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