High-temperature heat treatment device under magnetic field and method thereof for preparing bismuth ferrite film

Abstract

The invention provides a high-temperature heat treatment device under a magnetic field and a method thereof for preparing a bismuth ferrite film. The device comprises a tube type heating furnace, wherein the tube type heating furnace is arranged between magnet pole heads of a direct current water-cooling magnet, the direct current water-cooling magnet is connected with a direct-current magnet power supply and a circulating water-cooling system, the heating cavity of the tube type heating furnace is communicated with a vacuumizing system and an atmosphere control system; the tube type heating furnace is also connected with a temperature controller; the water-cooling cavity is formed by adopting a double-layer nonmagnetic stainless steel material by the shell of the tube type heating furnace; heating bodies are connected in series by four silicon carbide rods; a high-temperature resistant aluminum oxide heat insulating fiber material is used as a heat insulating material; and a high-temperature aluminum oxide ceramic tube or a quartz glass tube is used as a furnace tube. The device has the characteristics of small volume, high magnetic field utilization ratio and heating efficiency,and the like, can be used for carrying out the synthesis and the heat treatment on materials below 2 Tesla of the magnetic field and under the condition of vacuum or atmosphere. The microstructure and the properties of the bismuth ferrite film prepared by the device are improved.

Description

Technical field: [0001] The invention relates to a device for material synthesis and high-temperature heat treatment under magnetic field conditions, in particular to a high-temperature tube furnace device working under a DC water-cooled magnet and a method for preparing a bismuth ferrite film. Background technique: [0002] In recent years, the preparation and heat treatment of materials under magnetic field conditions have received great attention. The magnetic field can effectively change the formation of various defect states and ordered phases in the crystallization process of the material. At the same time, the magnetic field conditions provide a new driving energy for material synthesis, which can change the electron spin and nuclear spin of the reactants and promote ion diffusion , Increase the activation of reactants and increase the selectivity of the reaction, thereby inducing new physical and chemical changes, and preparing new materials and new material properties th...

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Problems solved by technology

However, the magnetic and magnetoelectric coupling effects of this material are usually weak, and its physical properties are closely related to the preparation process, and it is easy to generate large leakage currents that affect ferroelectric polarization. These factors are the key issues restricting its application. Research Hot Issues

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