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(1-x)(ba,bi,na)tio3-xcofe2o4 composite multi-iron ceramic and preparation method thereof

A multiferroic ceramic, fe2o3 technology, applied in the field of material science, can solve the problems of not meeting the application requirements, small magnetoelectric coupling coefficient, etc., achieve good ferroelectricity, simple equipment and preparation process

Inactive Publication Date: 2008-09-17
NANJING UNIV
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  • Application Information

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Problems solved by technology

However, the magnetoelectric coupling coefficient of the single-phase magnetoelectric coupling material is small, which cannot meet the application requirements.

Method used

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  • (1-x)(ba,bi,na)tio3-xcofe2o4 composite multi-iron ceramic and preparation method thereof

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] The first step: first determine the value of x (in this experiment, x is respectively 0.1, 0.2, 0.3, 0.4, 0.5). According to the chemical formula (1-x) BBNT-xCFO, weigh the dried Bi with a purity greater than or equal to 99.0%. 2 o 3 、Na 2 CO 3 , BaTiO 3 、Co 2 o 3 and Fe 2 o 3 powder, add alcohol to the mixture of the five powders, and then ball mill (350 rpm, 12 hours) to make the five powders mix evenly.

[0030] The second step: After drying the powder obtained in the first step, put it into Al 2 o 3 crucible, and covered with Al 2 o 3 The crucible lid is placed in a heating furnace for sintering. The heating rate is 5°C / min, and sintering is performed at 800°C for 2 hours.

[0031] Step 3: Add alcohol to the pre-burned powder and perform ball milling (350 rpm, 12 hours) to refine the powder particles.

[0032] Step 4: ...

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Abstract

The invention relates to a composite multiferroic ceramic (1-x)(Ba, Bi, Na)TiO3-xCoFe2O4, wherein x is more than or equal to 0.1 but less than or equal to 0.5. A production method of the composite multiferroic ceramic is also disclosed. The method comprises the following steps: 1) weighing Bi2O3, Na2CO3, BaTiO3, Co2O3 and Fe2O3 at the given ratio mentioned above, grinding and mixing thoroughly; 2) mixing the fine powder obtained in the step 1) with a binder and mixing thoroughly; 3) compression-molding the powder obtained in the step 2) under 10-20 MPa to obtain sheet with a thickness of 2.0 plus or minus 10% mm; and 4) in a sealed container, placing the sheet obtained in the step 3) over the fine powder obtained in the step 1), covering the sheet with the fine powder, placing the sealed container loading the sheet and powder in a heating furnace, and sintering, to obtain the composite multiferroic ceramic (1-x)(Ba, Bi, Na)TiO3-xCoFe2O4, wherein the sintering temperature is 1000-1250 DEG C and the sintering time lasts 2-3 hours. The product is free of lead and environment-friendly. The production equipment and process are simplified.

Description

1. Technical field [0001] The invention belongs to the field of material science, in particular to a (1-x) (Ba, Bi, Na) TiO 3 -xCoFe 2 o 4 Composite multiferroic ceramics, and a method for preparing the novel composite phase magnetoelectric coupling ceramics by a solid-state sintering method. 2. Background technology [0002] Materials with (anti)ferroelectric, (anti)ferromagnetic, piezoelectric and other properties at the same time are called multiferroic materials. This type of material combines electricity, magnetism, and force, and can realize the mutual regulation of these parameters. For example, the magnetism of the material can be controlled by the electric field or the electrical polarization of the material can be controlled by the magnetic field, so that this type of material can be used in new, highly integrated It has important application prospects in electronic devices such as non-volatile memories, magnetron optical modulators, and transducers. For exampl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/26C04B35/622
Inventor 庞凌华张善涛王磊张羿陈延峰
Owner NANJING UNIV
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