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Preparation method of bismuth-ferrite-based multiferroic ceramic

A technology of bismuth ferrite and ceramics, which is applied in the field of preparation of bismuth ferrite-based multiferroic ceramics, can solve the problems of large leakage current of bismuth ferrite, easy volatilization of bismuth element, small dielectric constant, etc., and achieve low requirements for experimental equipment, Ease of industrial production and broad application prospects

Inactive Publication Date: 2015-03-04
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the volatilization of bismuth element and the fluctuation of the valence state of iron element, the synthesis process of bismuth ferrite is usually accompanied by Bi 2 Fe 4 o 9 and Bi 25 FeO 40 The generation of impurity phases, resulting in larger leakage current, lower resistivity, and lower dielectric constant of bismuth ferrite samples, it is difficult to obtain a saturated hysteresis loop at room temperature
Therefore, it has been a challenge to synthesize high-quality bismuth ferrite samples

Method used

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  • Preparation method of bismuth-ferrite-based multiferroic ceramic

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Embodiment 1

[0024] 1) At room temperature, according to the chemical formula 0.95BiFeO 3 -0.05BaTiO 3 For raw material Bi 2 o 3 , Fe 2 o 3 、BaCO 3 and TiO 2 Proportionally weighed, added to a ball mill, and ball milled with absolute ethanol as a medium for 3 hours; the obtained mixed solution was dried in a blast drying oven at 120°C for 10 hours to become a solid;

[0025] 2) Add the polyvinyl alcohol aqueous solution to the dried mixed powder in step 1), stir evenly, grind and pass through a 100-mesh sieve to obtain powder; the mass concentration of the polyvinyl alcohol aqueous solution is 5%, and the added The aqueous solution of polyvinyl alcohol accounts for 3% of the total mass of the powder;

[0026] 3) the powder obtained in step 2) is mixed with 100kg / cm in a stainless steel grinding tool 2 The pressure is pressed into a green wafer, and the green wafer is placed in a crucible, and then the crucible is placed in a box-type sintering furnace for sintering; the box-type si...

Embodiment 2

[0029] 1) At room temperature, according to the chemical formula 0.7BiFeO 3 -0.3BaTiO 3 For raw material Bi 2 o 3 , Fe 2 o 3 、BaCO 3 and TiO 2 Proportionally weighed, added to a ball mill, and ball milled with absolute ethanol as a medium for 12 hours; the obtained mixed solution was dried in a blast drying oven at 100°C for 24 hours to become a solid;

[0030] 2) Add the polyvinyl alcohol aqueous solution to the dried mixed powder in step 1), stir evenly, grind and pass through a 200-mesh sieve to obtain powder; the mass concentration of the polyvinyl alcohol aqueous solution is 4%, and the added The aqueous solution of polyvinyl alcohol accounts for 6% of the total mass of the powder;

[0031] 3) the powder that step 2) obtains in the stainless steel grinding tool with 250kg / cm 2 The pressure is pressed into a green wafer, and the green wafer is placed in a crucible, and then the crucible is placed in a box-type sintering furnace for sintering; the box-type sintering...

Embodiment 3

[0034] 1) At room temperature, according to the chemical formula 0.7BiFeO 3 -0.3BaTiO 3 For raw material Bi 2 o 3 , Fe 2 o 3 、BaCO 3 and TiO 2Proportionally weighed, added to a ball mill, and ball milled with absolute ethanol as a medium for 12 hours; the obtained mixed solution was dried in a blast drying oven at 100°C for 24 hours to become a solid;

[0035] 2) Add the polyvinyl alcohol aqueous solution to the dried mixed powder in step 1), stir evenly, grind and pass through a 200-mesh sieve to obtain powder; the mass concentration of the polyvinyl alcohol aqueous solution is 4%, and the added The aqueous solution of polyvinyl alcohol accounts for 6% of the total mass of the powder;

[0036] 3) the powder that step 2) obtains in the stainless steel grinding tool with 250kg / cm 2 The pressure is pressed into a green wafer, and the green wafer is placed in a crucible, and then the crucible is placed in a box-type sintering furnace for sintering; the box-type sintering ...

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Abstract

The invention relates to a preparation method of bismuth-ferrite-based multiferroic ceramic. According to the preparation method, such steps in the conventional solid-phase method as pre-sintering and secondary fine grinding are eliminated, raw materials are uniformly mixed, are subjected to direct dry pressing to obtain disc-shaped ceramic with a desired size and then are directly sintered to obtain ceramic. By reasonably controlling experimental parameters such as the ratio and the sintering temperature, the excellent-property multiferroic ceramic having pure and single structure, no impurity phases, regular grain shape and compact and orderly arrangement can be obtained. The method disclosed by the invention is simpler than the conventional solid-phase method and easy to control, has the advantages of low requirement on laboratory device, no pollution and low cost and is easy for realization of industrial production.

Description

technical field [0001] The invention relates to the field of preparation of inorganic non-metallic materials, in particular to a preparation method of bismuth ferrite-based multiferroic ceramics. Background technique [0002] Multiferroic material is a new type of multifunctional material with two or more ferrotypes such as ferromagnetism, ferroelectricity and ferroelasticity at the same time, and due to the coupling between various ferrotypes, it will also produce piezomagnetic effect, The magnetoelectric effect and magnetron polarization reversal effects have broad application prospects in the fields of data storage, spintronics, and microelectronics, and have attracted widespread attention. [0003] Bismuth ferrite (BiFeO 3 , BF) is a typical room temperature single-phase multiferroic material, and its ferroelectric Curie temperature T C About 1103K, antiferromagnetic Niel temperature T N It is about 647K, and it is one of the few multiferroic magnetoelectric materials...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/26C04B35/622
Inventor 王大伟王青山崔岩刘峰斌屈敏焦志伟
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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