Equipment and method for synthesizing multi-crystal/single-crystal manganese oxide for infrared detection and magnetic sensing

Abstract

The invention discloses equipment and a method for synthesizing multi-crystal / single-crystal manganese oxide for infrared detection and magnetic sensing. The equipment comprises a colloid system, a transfer system, a polycrystalline system, a spin-coating system, a lifting system and a sintering system, according to the colloidal system, a sol-gel method is used as a material synthesis core, raw materials are provided for subsequent preparation of different forms of materials, a polycrystalline ceramic material with design components highly consistent with actual components can be prepared in a polycrystalline system, and a single crystal thin film material which is high in mirror degree, free of bubbles and large in molecular weight impurity can be prepared in a spin-coating system; and the component contents of different thin film materials prepared in the lifting system are highly consistent. Various forms of manganese oxide materials are synthesized and prepared in one set of equipment in a high-efficiency, high-quality and high-yield manner.

Description

technical field [0001] The invention relates to the field of strongly correlated electronic materials, in particular to synthesis equipment and methods for polycrystalline and single-crystalline manganese oxide materials based on infrared detection and magnetic sensitive sensing applications. Background technique [0002] Manganese oxides are the research hotspots of giant magnetoresistance materials in recent years, which contain the basic problems of strongly correlated electronic materials. At the same time, manganese oxide materials can be used in infrared detectors and magnetic sensors because of their excellent magnetoresistance effect and a series of rich and unique electromagnetic properties such as high resistance temperature coefficient near the metal insulation phase transition temperature. . [0003] However, there are still several common problems in the research field of this material that need to be solved: i) the material needs a large magnetic field to exci...

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Problems solved by technology

[0005] (1) The current medium-scale and above-scale synthesis equipment and methods are all focused on the preparation of a single form of material, such as the special synthesis of polycrystalline ceramic materials and the corresponding single crystal thin film materials; at the same time, most of the devices use poor reaction uniformity. The solid-phase method is used as a synthetic route, and the obtained material has many impurities

[0006] (2) In the existing colloid production equipment based on the liquid phase process, the particle size pretreatment of chemical raw materials is extremely lacking

Because the particle size of various chemical raw materials is not uniform, it is easy to cause reaction agglomeration, resulting in a large number of impurities

At the same time, most of the devices adopt an open reaction environment at normal pressure. On the one hand, it is easy to overflow a large amount of reaction gas, causing a major safety hazard; Low

[0007] (3) The current polycrystalline ceramic synthesis equipment generally simply uses impact crushing or rolling extrusion crushing to crush the dry gel precursor. The above-mentioned process is limited by the processing path or the direction of the processing space and cannot be comprehensive Process the xerogels into corresponding fine powders. If the particle size gap between different xerogel particles is too large, it will affect the density of subsequent polycrystalline ceramics.

[0008] (4) At present, most single crystal thin film materials are prepared by physical sputtering process, but due to factors such as high temperature, high energy and complex atmosphere environment in the sputtering process, the actual composition of the obtained thin film material is different from the designed composition. big gap

A small number of equipment based on the liquid phase method to prepare thin films lacks the pre-treatment of colloids, such as gas filtration, impurity removal, uniform dispersion or improvement of reactivity, so that whether it is prepared by spin coating method or pulling method High impurity content in the single crystal thin film

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