Layered perovskite structural ceramic and preparation method thereof

A perovskite structure and layered technology, applied in the field of ceramic materials, can solve the problems of high sintering temperature, unimproved ferroelectric properties, and difficulty in obtaining a single-phase layered perovskite structure, achieving high reactivity and composition The effect of uniformity, high density and orientation

Inactive Publication Date: 2013-01-16
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

[0005] The Chinese patent with the publication number CN 102167584A discloses a five-layer structure bismuth titanate-iron-cobaltate ceramic material with multiferroic properties and its preparation method. Cobalt ions are doped at the B site to realize the coupling between iron-cobalt ions , and then improve the ferromagnetic properties of the material, but the ferroelectric properties of the material have not been improved, and the solid phase sintering process is adopted, the sintering temperature is high, and it is difficult to obtain a single-phase layered perovskite structure

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  • Layered perovskite structural ceramic and preparation method thereof
  • Layered perovskite structural ceramic and preparation method thereof
  • Layered perovskite structural ceramic and preparation method thereof

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[0034] The present invention also provides a corresponding preparation method for the layered perovskite structure ceramics, including the following steps: A) dissolving titanate compounds, bismuth source compounds, strontium source compounds, iron source compounds and cobalt source compounds in proportion Solvent, add complexing agent and mix and stir, adjust the pH value to 4~7, heat, evaporate to dryness and burn into powder, and pre-calcine to obtain powder; B) Press the powder into tablets, perform hot pressing and sintering to obtain layer perovskite-structured ceramics.

[0035] In order to clearly illustrate the present invention, the experimental processes of step A and step B are described in detail below respectively.

[0036] The step A is specifically: dissolving the bismuth source compound, strontium source compound, iron source compound, cobalt source compound and titanate compound in the solvent according to the ratio of the amount of substances, adding a compl...

Embodiment 1

[0052] 1.1 Mix bismuth nitrate pentahydrate, strontium nitrate, iron nitrate nonahydrate, cobalt nitrate hexahydrate and n-butyl titanate according to the molar ratio Bi:Sr:Fe:Co:Ti=6.75 (1+0.05):0.25:1.5:1.5 Dissolve in nitric acid at a ratio of :3, add complexing agents ethylenediaminetetraacetic acid (EDTA) and citric acid, the molar ratio of EDTA, citric acid and metal ions is 0.7:1:1, mix and stir, add ammonia water dropwise to adjust the solution The pH value was 7, and a clear solution was obtained, which was heated and concentrated in a ceramic evaporating dish until the solution was evaporated to dryness, then burned into powder, and pre-fired in a muffle furnace at 750°C for 3 hours to obtain a powder.

[0053] 1.2 Grind the powder obtained in 1.1 for 30 minutes, and shape it into a disc with a diameter of 25 mm and a thickness of 4 mm with a manual dry press (Tianjin Keqi Company Model 40C) under a pressure of 120 MPa. The outer layer of the disc is 15% bismuth eleme...

Embodiment 2

[0058] 2.1 Mix bismuth nitrate pentahydrate, strontium nitrate, iron nitrate nonahydrate, cobalt nitrate hexahydrate and n-butyl titanate according to the molar ratio Bi:Sr:Fe:Co:Ti=6.5 (1+0.05):0.5:1.5:1.5 Dissolve in nitric acid at a ratio of :3, add complexing agents ethylenediaminetetraacetic acid (EDTA) and citric acid, the molar ratio of EDTA, citric acid and metal ions is 0.7:1:1, mix and stir, add ammonia water dropwise to adjust the solution The pH value was 7, and a clear solution was obtained, which was heated and concentrated in a ceramic evaporating dish until the solution was evaporated to dryness, then burned into powder, and pre-fired in a muffle furnace at 750°C for 3 hours to obtain a powder.

[0059] 2.2 Grind the powder obtained in 2.1 for 30 minutes, and form it into a disc with a diameter of 25 mm and a thickness of 4 mm with a manual dry press (Tianjin Keqi Company Type 40C) under a pressure of 120 MPa. The outer layer of the disc is 15% bismuth in excess...

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Abstract

The invention provides layered perovskite structural ceramic and a preparation method thereof. The preparation method includes mixing well titanate compounds, bismuth compounds, strontium compounds, iron compounds, cobalt compounds and complexing agent in solvent, heating, drying and combusting to obtain powder, and presintering to obtain powder; performing the powder, and performing hot-pressing sintering to obtain the structural ceramic in in a formula (I). Compared with ceramics prepared in the prior art by solid phase sintering process, the structural ceramic in the formula (I) is prepared by solution process and hot pressing sintering. The preparation method has the advantages that less volatile low-valence strontium ions are introduced, increased leakage current due to volatilization of the strontium ions is improved, and ferroelectric properties are improved; the raw materials are evenly spread by the solution process, the power is even in component and has high reactivity, and Fe-Co ions are coupled fully; and the materials processed by hot pressing sintering are high in density and orientation, and the layered perovskite structural material can be obtained, namely Bi(n+1-x)SrxF3(n-3)/2Co(n-3)/2Ti3O3(n+1) (I).

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a layered perovskite structure ceramic and a preparation method thereof. Background technique [0002] Magnetoelectric multiferroic materials refer to materials that exhibit ferroelectric order and ferromagnetic / antiferromagnetic order at the same time in a certain temperature range, and there is a certain coupling between them. In recent years, because multiferroic materials can not only be used in the research and development of ferroelectric and magnetic devices, but more importantly, they can use the coupling between magnetoelectricity, that is, the application of an electric field can control the ferromagnetic polarization and the application of a magnetic field can control the ferromagnetic polarization. Electric polarization provides an additional degree of freedom for the design and application of devices, thus showing extremely attractive applicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622
Inventor 陆亚林王建林刘敏李林王政雷志威凌意瀚彭冉冉陈小兵
Owner UNIV OF SCI & TECH OF CHINA
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