Multi-element crystal purification device and method

Abstract

The invention discloses a multi-element crystal purification device and method. The purification device comprises a furnace body, wherein a zone melting device and a purification ampoule are arranged in the furnace body; the furnace body consists of an inner-layer metal furnace chamber, an outer-layer heating device, an air pressure control device and a cooling device; and the zone melting device comprises an ampoule support, a resistance heating ring and a transmission device. The transmission device is composed of a guide rail, a lead screw, a rack sliding block and a reversing gear. The purification ampoule comprises a protection container, a purification container and a crucible; and the crucible comprises a purification crucible and a pressure control crucible. An outer-layer heating device is used for assisting, so that the pipe wall temperature can be maintained, the steam pressure in the pipe can be maintained, and crystal decomposition is inhibited; and a controllable pressurizing device is used for assisting, so that the internal and external pressure difference of the purification container is reduced, the container is kept stable, and the explosion risk is reduced. The method can effectively solve the problem of component decomposition during the purification process of the multi-element crystal containing volatile components, ensures the stoichiometric ratio of the crystal, reduces the generation of vacancy and displacement defects in the crystal, and ensures the optical and electrical properties of the crystal.

Description

technical field [0001] The invention relates to the purification of multiple compound crystals, in particular to a purification device and method for multiple crystals. Background technique [0002] As a physical purification method, the zone melting method is often used after chemical synthesis and chemical purification to further purify the target product. The zone melting purification method is the application of melt cooling and crystallization technology. When using it, the crystal is first melted to form a melting zone; then a temperature gradient is created to obtain a solid-liquid boundary area; separation or crystal growth. [0003] Traditional zone melting devices use high-purity nitrogen, hydrogen, argon, etc. as protective gases, but when the zone melting ingot is a compound with reversible decomposition reactions such as phosphorus germanium zinc, indium phosphide, and indium iodide, there is a difference. As a multi-component compound crystal, when the temper...

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Problems solved by technology

[0004] In order to solve the problem that crystals are easy to decompose during the purification process of multi-element crystals containing phosphorus, iodine, arsenic, etc., the present invention especially provides a multi-element crystal purification device and method

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