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0-3 bismuth ferrite based magnetoelectric composite material and preparation method thereof

A technology of magnetoelectric composite material and bismuth ferrite, which is applied in the field of functional materials to achieve the effect of improving ferromagnetism and magnetoelectric coupling performance

Active Publication Date: 2019-03-26
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there is no relevant report on the method of preparing 0-3 composite bismuth ferrite-based ceramics and improving its magnetoelectric coupling coefficient through non-stoichiometric ratio

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  • 0-3 bismuth ferrite based magnetoelectric composite material and preparation method thereof
  • 0-3 bismuth ferrite based magnetoelectric composite material and preparation method thereof
  • 0-3 bismuth ferrite based magnetoelectric composite material and preparation method thereof

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preparation example Construction

[0034] At the same time, the application also provides the preparation method of the 0-3 bismuth ferrite-based magnetoelectric composite material, comprising the following steps:

[0035] The bismuth source, iron source, barium source and titanium source are dosed according to the relative ratio of each component in the 0-3 bismuth ferrite-based magnetoelectric composite material shown in formula (I);

[0036] The raw materials after batching are ball-milled and then synthesized to obtain a synthetic powder;

[0037] After ball milling the synthetic powder, adding a binder and sintering to obtain a 0-3 bismuth ferrite-based magnetoelectric composite material;

[0038] (1-y) Bi (1-x) FeO (3-1.5x) -yBaTiO 3 (I);

[0039] Wherein, 0

[0040] In the above-mentioned process of preparing 0-3 bismuth ferrite-based magnetoelectric composite materials, the present application adopts the commonly used ferroelectric ceramic preparation process without prior synthesis ...

Embodiment 1

[0054] Preparation of 0.75BiFeO by a traditional solid-state sintering method 3 -0.25BaTiO 3 ceramics. According to the stoichiometric ratio of the above ceramic materials, Bi 2 o 3 , Fe 2 o 3 、BaCO 3 and TiO 2 (Analytical grade, Sinopharm Group) according to the ratio, put it into a ball mill tank, add alcohol and ball mill for 12 hours, then dry it, heat it at 850°C for 1h, and heat it at 940°C for 1h to synthesize; then ball mill the synthesized powder, add appropriate binder Pressed into a disc with a diameter of 25.4 mm, and sintered at 1000 ° C for 4 hours to obtain a ceramic sample with a diameter of about 21 mm.

[0055] The ceramic sheet was polished on both sides, and the microstructure, piezoelectric coefficient, residual magnetization and magnetoelectric coupling coefficient of the sample were tested. Figure 4 The cross-sectional backscattering spectrum of the sample shows that the stoichiometric bismuth ferrite-barium titanate solid solution (x=0) is a sa...

Embodiment 2

[0057] The 0.75Bi of non-stoichiometric ratio is prepared by adopting the same method method as in example 1 (1-x) FeO (3-1.5x) -0.25BaTiO 3 For ceramics, x=0~0.24 (x is not equal to 0). The ceramic sheet was polished on both sides, and the microstructure, piezoelectric coefficient, residual magnetization and magnetoelectric coupling coefficient of the sample were tested.

[0058] Figure 4 The backscattering spectrum of the cross-section shows very intuitively the distribution of the second phase with x values ​​of 0, 0.12 and 0.24; from Figure 4 It can be seen from the figure that with the increase of the degree of bismuth deficiency, the content of the second phase shows an obvious increasing trend, and the distribution of the second phase always maintains a uniform state.

[0059] Such as figure 1 As shown, in the range of x = 0 ~ 0.12, the piezoelectric coefficient of the sample fluctuates between 30 ~ 35pC / N, without much change, and after x exceeds 0.12, with the ...

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Abstract

The invention provides a 0-3 bismuth ferrite based magnetoelectric composite material shown as a formula (I), and also provides a preparation method of the 0-3 bismuth ferrite based magnetoelectric composite material. The method comprises the following steps that a bismuth source, an iron source, a barium source and a titanium source are mixed according to the relative proportion of all ingredients in the 0-3 bismuth ferrite based magnetoelectric composite material shown as the formula (I); the mixed raw materials are subjected to ball grinding and are then synthesized to obtain synthesized powder; the synthesized powder is subjected to ball grinding; then, bonding agents are added for tableting; sintering is performed to obtain the 0-3 bismuth ferrite based magnetoelectric composite material. The 0-3 bismuth ferrite based magnetoelectric composite material shown as the formula (I) is obtained by a non-stoichiometric proportioning method; the composite material can realize second phaseuniform dispersion, so that the magnetoelectric coupling performance of the composite material is excellent; the formula (I) is (1-y)Bi(1-x)FeO(3-1.5x)-yBaTiO3.

Description

technical field [0001] The invention relates to the technical field of functional materials, in particular to a 0-3 bismuth ferrite-based magnetoelectric composite material and a preparation method thereof. Background technique [0002] Magnetoelectric coupling is a property that can convert electric field energy and magnetic field energy into each other. The magnetoelectric coupling material can change its electrical polarization state under the action of an external magnetic field, which is called the positive magnetoelectric coupling effect P=α E H; under the action of an electric field, its magnetic polarization state can be changed, which is called the inverse magnetoelectric coupling effect M = α H E; where P, M, E and H are polarization, magnetization, electric field and magnetic field respectively, α E and alpha H is called the magnetoelectric coupling coefficient. [0003] In 1894, Curie (Curie) first proposed that molecules with asymmetric structure may be pola...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
CPCC04B35/26C04B35/622C04B2235/3215C04B2235/3236C04B2235/3298C04B2235/656C04B2235/6567
Inventor 初宝进潘祺
Owner UNIV OF SCI & TECH OF CHINA
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