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Method for growing rare-earth ferrite magneto-optical crystal

A magneto-optic crystal and growth method technology, applied in crystal growth, single crystal growth, single crystal growth, etc., can solve the problems of small crystal size, low integrity, low yield, etc., to achieve control of component volatilization, production The effect of low cost and convenient operation

Inactive Publication Date: 2009-09-30
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the flux method can reduce the growth temperature and change the crystallization characteristics of the crystal, the crystal size grown by the traditional flux method is relatively small, the integrity is not high, and the yield is low
The quality of crystals grown by hydrothermal method is not high, and solvent ions are easy to enter the crystal and become impurity ions, affecting the optical properties of the crystal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh Y with a molar ratio of 1:1 2 o 3 and Fe 2 o 3 , mixed evenly, and pre-fired at 1000°C to form a primary sintered material; the composite flux is based on PbO, PbF 2 and B 2 o 3 The molar ratio is 10:5:1; according to the initial firing material (Y 2 o 3 +Fe 2 o 3 ) and composite flux mole percentage 15%: 85% to prepare initial raw materials. Grind and mix the initial raw materials evenly, press them into a block with a diameter of 49 mm and a height of 30 mm on a press, and then place it in a cylindrical platinum crucible with a diameter of 50 mm. Control the temperature at 1280°C and maintain the temperature gradient at the growth interface at 70°C / cm. After the raw materials are completely melted, gas is introduced into the bottom of the crucible at a flow rate of 3L / min, and the crucible is lowered at a speed of 0.5mm / h. After the growth is over, the crystal ingot is peeled off from the crucible, put into hot nitric acid solution and corroded for 24 ...

Embodiment 2

[0023] Weighing Er with a molar ratio of 1:1 2 o 3 and Fe 2 o 3 , mixed evenly, and pre-fired at 1000°C to form a primary sintered material; composite flux PbO, PbF 2 and B 2 o 3 The molar ratio is 10:6:1; according to the initial firing material (Er 2 o 3 +Fe 2 o 3 ) to the composite flux molar ratio of 1:4 (20%:80%) to prepare the initial raw materials. Grind and mix the initial raw materials evenly, press them into a block with a diameter of 59 mm and a height of 30 mm on a press, and then place it in a cylindrical platinum crucible with a diameter of 60 mm. Controlled at 1300°C, the temperature gradient at the growth interface was maintained at 50°C / cm. After the raw materials were completely melted, gas was introduced into the bottom of the crucible at a flow rate of 2L / min, and the crucible was lowered at a speed of 1mm / h. After the growth is over, the ingot is peeled off from the crucible, put into a nitric acid solution and etched for 24 hours, and ErFeO can ...

Embodiment 3

[0025] Weigh La with a molar ratio of 1:1 2 o 3 and Fe 2 o 3, mixed evenly, and pre-fired at 1100 ° C to form a primary sintered material; composite flux PbO, PbF 2 and B 2 o 3 The molar ratio is 10:7:1; the initial firing material (La 2 o 3 +Fe 2 o 3 ) and compound flux in a molar ratio of 1:3 (25%:75%) to prepare the initial raw materials. Grind and mix the initial raw materials evenly, press them into a block with a cross-section of 39mm×39mm on a press, and then place it in a square columnar platinum crucible with a cross-section of 40mm×40mm. The temperature is controlled at 1350°C, and the temperature gradient at the growth interface is maintained at 60°C / cm. After the raw materials are completely melted, circulating water is introduced into the bottom of the crucible at a flow rate of 2L / min, and the crucible is lowered at a speed of 1.5mm / h. After the growth is over, the crystal ingot is peeled off from the crucible, put into a hot nitric acid solution and co...

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Abstract

The invention relates to a method for growing a rare-earth ferrite magneto-optical material RFeO3 crystal (R is Y, Gd, Tm, Nd, Sm, Eu, Ho, Yb and other rare-earth elements), which belongs to the field of monocrystalline growth. The method comprises the following steps: evenly mixing an initial firing material formed by R2O3 and Fe2O3 with a composite fluxing agent of PbO, PbF2 and B2O3; placing the mixture in a platinum crucible to be sealed by air; placing the crucible in a reducing furnace to heat and melt the raw materials; and realizing growth of the rare-earth magneto-optical crystal of different chemical compositions by controlling the temperature of the furnace, regulating air flow amount or water flow amount of the bottom of the crucible, and optimizing the gradient of solid-liquid interface temperature, the growth speed and other parameters. The method reduces the growth temperature of the crystal trough the fluxing agent, and causes local supercooling and quick nucleating by introducing air or water to the bottom of the crucible, thereby growing the RFeO3 monocrystal with large dimension. Meanwhile, the method has simple equipment, one furnace more products and low cost, and is favorable for realizing batch production of the crystal and the like.

Description

technical field [0001] The invention relates to a method for preparing rare earth ferrite magneto-optic crystal RFeO 3 A new method, specifically, using the crucible drop method to grow RFeO from high-temperature solution 3 Crystals, and the induction of nucleation and growth by passing air or water at the bottom of the crucible belongs to the field of single crystal growth. Background technique [0002] Magneto-optical crystals are an important class of optical functional materials. Magneto-optical devices with optical modulation, optical isolation, optical switches, optical deflection, optical information processing, optical storage, and other optical-electromagnetic conversion functions can be fabricated by using their magneto-optical effects. Strategic high-tech materials that are urgently needed for systems such as optical communications, optical networks, and information processing. [0003] The magneto-optical devices currently used in the market mainly use garnet-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B11/00C30B29/24
Inventor 申慧徐家跃武安华金敏张红玲王红李新华
Owner SHANGHAI INST OF TECH
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