Method for growing RFeO3 photomagnetic function crystal by secondary melting method

Abstract

The invention relates to the field of research on growth of RFeO3 photomagnetic function crystal, an optical floating zone secondary melting method is a brand new and efficient growth method for the materials at present. In the method, high-purity ferric oxide and rare earth oxide are used as raw materials to prepare a material bar through processes of milling, sintering, isostatic pressing and the like according to chemical proportion, and then, the material bar is placed in an optical floating zone furnace to grow in air atmosphere. A surface of a single crystal prepared by the method has ideal surface finish, density and uniformity, a characteristic peak of the single crystal is obviously increased, and FWHM is obviously reduced, so that crystallization quality of the crystal is greatly improved, a pure-phase integral RFeO3 crystal can be obtained more easily; simultaneously, the method has high efficiency and can appropriately adjust growth speed in a rang of 1-9mm/h according to different application goals, that is unachievable to traditional methods, such as a pulling method, a hydrothermal method, a descending method and the like.

Description

technical field [0001] The invention relates to an optical floating zone secondary melting method for growing rare earth ortho-ferrite R The invention relates to a single crystal method of FeO3 optomagnetic functional crystal series, which belongs to the technical field of crystal growth. Background technique [0002] rare earth R FeO 3 The series of materials are commonly known as rare earth orthoferrite materials. Due to the unique magnetic properties, magneto-optic and opto-magnetic properties of this series of materials, they have always attracted the attention of physicists and material scientists. In continuous expansion, it can be made into optical devices such as magneto-optical switches, modulators, deflectors, sensors, etc., especially as a Faraday rotor material in isolators, and is widely used in optical fiber communication and other fields. It is compatible with most magneto-optic crystals currently studied (such as the garnet-structured Y 3 Fe 5 o 12 crys...

AI Technical Summary

Problems solved by technology

There are many problems in the growth of RFeO3 crystals by the flux method. The flux can lower the melting temperature, but the content of the flux is very high, and the mass fraction of the melt is average. Only 10%-15%, resulting in very little melt crystallization, no large crystal particles, not only the crystal size is small, but also the phase relationship is very complicated, and PbFe12O19 and other package phase

In addition, the corrosion of precious metal crucibles by iron oxides is difficult to avoid, and the pollution of lead oxides to the environment cannot be ignored.

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