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Xsrtio3-(1-x) cofe2o4 composite material and preparation method thereof

A composite material and solution technology, which is applied in the field of composite multiferroic material preparation, can solve problems such as insufficient compactness, failure to reach the furnace, and existence of samples, so as to reduce the influence of external factors, avoid external factors, and improve ferroelectric properties. Improved effect

Inactive Publication Date: 2012-08-22
HEBEI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the high sintering temperature in the preparation process, the furnace cannot reach its temperature, resulting in many holes in the sample, the compactness is not good enough, and there is a certain leakage current in the sample, and there is no magnetic field for composite ceramics in the article of Song Hui et al. capable of in-depth analysis

Method used

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  • Xsrtio3-(1-x) cofe2o4 composite material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0023] When x=0.5, the preparation of SrTiO with a composite ratio of strontium titanate and cobalt ferrite at 1:1 3 -CoFe 2 o 4 Composite powder. The preparation process is as follows:

[0024] (1) Dissolve 0.04mol of strontium nitrate and 0.04mol of citric acid in deionized water, and fully stir for 10min to form a citrate solution;

[0025] (2) First add 46.3ml of absolute ethanol to the beaker, then pour 4.63ml of glacial acetic acid, stir slightly, and finally add 13.89ml of butyl titanate to form a butyl titanate alcohol solution, and the citrate obtained in step (1) The solution and the butyl titanate alcohol solution were fully mixed and stirred for 30 minutes until light yellow and transparent, and the strontium titanate solution was obtained;

[0026] (3) To prepare cobalt ferrite solution, dissolve 0.04mol cobalt nitrate and 0.08mol ferric nitrate in deionized water, then add 0.08mol citric acid, and fully stir for 10min to obtain brown-red cobalt ferrite soluti...

Embodiment 2

[0032] The method is carried out as in Example 1, but the difference is that the sintering temperature is 900°C.

[0033] X-ray analysis shows that the composite ceramics initially form the diffraction peaks of strontium titanate and cobalt ferrite in the cubic phase, but there are Fe 2 o 3 Impurities, this is because the sintering temperature is not enough.

Embodiment 3

[0035] When x=0.9, the preparation of 0.9SrTiO with a composite ratio of strontium titanate and cobalt ferrite of 9:1 3 -0.1CoFe 2 o 4 Composite powder. The process is as follows:

[0036] (1) Dissolve 0.036mol of strontium nitrate and 0.036mol of citric acid in deionized water, and fully stir for 10min to form a citrate solution;

[0037] (2) First add 41.6ml of absolute ethanol, then pour 4.16ml of glacial acetic acid, stir slightly, and finally add 12.50ml of butyl titanate to form a butyl titanate alcohol solution, and mix the citrate solution obtained in step (1) with titanium The butyl ester alcohol solution was fully mixed and stirred for 30 minutes until it was light yellow and transparent, and the strontium titanate solution was obtained;

[0038] (3) To prepare a cobalt ferrite solution, dissolve 0.004mol cobalt nitrate and 0.008mol ferric nitrate in deionized water, then add 0.008mol citric acid, and stir for 10 minutes to obtain a brown-red cobalt ferrite solut...

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Abstract

The invention discloses an xSrTiO3-(1-x) CoFe2O4 composite material having ferromagnetism and ferroelectricity and a preparation method thereof. In the formula, x ranges from 0.5 or 0.6 or 0.7 or 0.8 or 0.9. Compared with single-phase ceramics, the composite ceramics have certain changes in ferroelectricity and ferromagnetism. The preparation method is an improved sol gel method and uses strontium nitrate, citric acid, cobalt nitrate, butyl titanate, absolute ethyl alcohol, glacial acetic acid and ferric nitrate as raw materials. The preparation method simplifies compound steps, effectively avoids outside affecting factors of particle compound, and reduces material compound temperature. The ferroelectricity of the xSrTiO3-(1-x) CoFe2O4 composite material is improved compared with single-phase SrTiO3, and a ferroelectric hysteresis loop tending to be saturated is obtained. The ferromagnetism has regularity along with increase of content of cobalt ferrite, and therefore actual application of composite materials is facilitated.

Description

technical field [0001] The present invention relates to a kind of xSrTiO 3 -(1-x)CoFe 2 o 4 The composite material and its preparation method belong to the technical field of composite multiferroic material preparation. Background technique [0002] In the research field of multiferroic materials, ceramic materials with single properties are difficult to meet the requirements of modern devices, so composite multiferroic materials have emerged and become a research hotspot. In the prior art, multiferroic materials are mostly particle composites. This type of particle composite material is a uniform composite of nanoparticles with ferromagnetostrictive phase and ferroelectric phase, and forms a multiferroic composite ceramic material through a sintering process. The advantages of this preparation method are: simple material ratio, low cost, and high magnetoelectric coupling coefficient of the material. The disadvantage is that the molecular level uniformity is not strong,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/47C04B35/26C04B35/624
Inventor 李宁郭革新王占才王卫轻
Owner HEBEI NORMAL UNIV
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