Preparation method of mayenite semiconductor material

Abstract

The invention discloses a preparation method of a mayenite semiconductor material. A benzene series compound A and mayenite material C12A7 are together disposed in a test tube and are sealed first. Then, the test tube is placed in a high temperature furnace and is warmed up to 200-300 DEG C, the A is volatilized by heat preservation for 0.5-2 hours to form an atmosphere. Next, heating temperatureof the test tube is improved to 900-1300 DEG C, and a black conductive C12A7 material is obtained by keeping high-temperature for processing for 10-120 hours. The method does not need to operate underhigh vacuum environment, and preparation process is simple; benzene series compounds used for preparation are more in kinds, cheap, and few in dosage, and provide multiple choice approaches for the production for the conductive C12A7, and the method effectively reduces manufacturing cost, is conducive to the industrialized production of the material, and has great application and promotion value.

Description

technical field [0001] The invention belongs to the technical field of inorganic materials, and in particular relates to a preparation method of a mayenite type semiconductor material. Background technique [0002] Dodecacalcium heptaaluminate 12CaO·7A1 2 o 3 (C12A7), a ceramic material belonging to the mayenite system. The raw materials used for the preparation of C12A7 are calcium and aluminum oxides, which have extremely high reserves in nature and have no impact on the environment. The molecular formula of C12A7 is [Ca 24 A1 28 o 64 ] 4+ 2O 2- , a mayenite unit cell is composed of twelve cage structures with a diameter of about 0.4nm, the diameter of the window between the cages can reach 0.1nm, and the O in the cage cavity 2- Ions are subject to little binding force, and due to the existence of channels and weaker binding effects, the exchange of ion groups inside and outside the cage can be realized. Years of research have found that the internal O in the C12A7...

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Problems solved by technology

However, the above methods all use single crystal C12A7 as the research object, and the material preparation is relatively difficult; although the research group later proposed the use of 11CaO·7A1 2 o 3 The raw material system of +Ca is calcined at high temperature to prepare C12A7 polycrystalline conductive materials, but the preparation procedure is relatively complicated and the process is difficult to control

In addition, the above preparation methods all need to use redox reactions to remove the O in the material unit cell 2- use e - Instead, the reducing materials used such as hydrogen, metal calcium, metal titanium, and carbon have strong reducing properties, and contact with oxygen will reduce their reducing ability and greatly reduce the electrical conductivity of the prepared materials, so the preparation environment is required to have a good anaerobic conditions

Usually, reducing substances and C12A7 are placed in a test tube and evacuated to 10 -3 Below Pa, follow-up treatment is carried out after sealing the tube at high temperature, and the operation process is cumbersome

Later, although C12A7:e was obtained by electron bombardment - , but this preparation method has higher requirements on equipment and cannot be mass-produced

At present, the simple and convenient preparation method of conductive C12A7 material is one of the research hotspots. Although more scholars have participated in the research on the electrical properties of C12A7 in recent years, there are still not many reports on relevant results.

Because of this, C12A7 conductive materials cannot be engaged in mass production, and their popularization and application are limited.

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