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La2Ti2O7:Mn<4+> multiferroic ceramic and preparation method thereof

A multiferroic ceramics, 24-hour technology, applied in the field of La2Ti2O7:Mn4+ multiferroic ceramics and its preparation, can solve the problems of Curie temperature reduction, impurity phase generation, small electric polarization, etc., and achieve ferroelectricity and ferromagnetism Improvement, simple manufacturing process, and increased feasibility

Inactive Publication Date: 2013-04-17
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most single-phase multiferroic materials have problems such as Curie temperature far lower than room temperature, large electrical conductivity, small electric polarization and small magnetoelectric coupling effect, which restrict their practical application value. Materials with high Curie temperature have the defects of difficult sintering and complex preparation process. If other materials are added for doping modification, the Curie temperature will decrease and defects such as impurities will occur. Therefore, it is urgent to explore a simple-step, product-free Preparation method of heterogeneous multiferroic materials with high Curie temperature and excellent ferroelectric and ferromagnetic properties

Method used

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  • La2Ti2O7:Mn&lt;4+&gt; multiferroic ceramic and preparation method thereof
  • La2Ti2O7:Mn&lt;4+&gt; multiferroic ceramic and preparation method thereof
  • La2Ti2O7:Mn&lt;4+&gt; multiferroic ceramic and preparation method thereof

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Embodiment 1

[0028] Preparation of La by solid phase method 2 Ti 2 o 7 :Mn 4+ (The molar ratio of lanthanum, titanium and manganese is 2:1.95:0.05) multiferroic ceramics. First, put 0.03mol of lanthanum oxide, 0.0585mol of titanium oxide and 0.0015mol of manganese oxide in an agate jar, add 25mL of absolute ethanol to mix them evenly, and use a ball mill to perform full ball milling at a speed of 350 rpm. The ball milling time is 24 hours; then, place the ball-milled sample in an oven at 100°C and dry it for 0.5 hours, and place the fully mixed powder in A1 2 o 3 The crucible was pre-fired in an air atmosphere, and the temperature was raised to 1000 °C at a rate of 5 °C / min, and the holding time was 24 hours to remove the moisture in the powder and some organic matter mixed in the ball milling process; finally, the pre-fired Dissolve the powder with nitric acid solution to remove unreacted oxides, dry the sample, and after ball milling for 0.5 hours, press it into a small circle with ...

Embodiment 2

[0031] Preparation of La by solid phase method 2 Ti 2 o 7 :Mn 4+ (The molar ratio of lanthanum, titanium and manganese is 2:1.92:0.08) multiferroic ceramics. First, put 0.03mol of lanthanum oxide, 0.0576mol of titanium oxide and 0.0024mol of manganese oxide in an agate jar, add 25mL of absolute ethanol to mix them evenly, and use a ball mill to perform full ball milling at a rate of 350 rpm. The ball milling time is 24 hours; then, place the ball-milled sample in an oven at 100°C and dry it for 0.5 hours, and place the fully mixed powder in A1 2o 3 The crucible was pre-fired in an air atmosphere, and the temperature was raised to 1000 °C at a rate of 5 °C / min, and the holding time was 24 hours to remove the moisture in the powder and some organic matter mixed in the ball milling process; finally, the pre-fired Dissolve the powder with nitric acid solution to remove unreacted oxides, dry the sample, ball mill for 0.5 hours, and press it into a small circle with a diameter ...

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Abstract

The invention relates to a preparation method of La2Ti2O7:Mn<4+> multiferroic ceramic, which comprises the following steps: (1) preparing high-purity La2O3, TiO2 and MnO2 according to a lanthanum-titanium-manganese mol ratio of 2:1.95:0.05 or 2:1.92:0.08; (2) adding anhydrous ethanol into the prepared materials in the step (1), uniformly mixing, and sufficiently performing ball milling; (3) drying the sample subjected to ball milling, further performing ball milling, placing the sufficiently mixed powder in an Al2O3 crucible, and presintering in an air atmosphere; and (4) dissolving the presintered powder with a nitric acid solution, drying the sample, performing ball milling, pressing into discs in a mold, placing the discs in the Al2O3 crucible, and sintering in an air atmosphere to obtain the ceramic. According to the invention, the La2Ti2O7:Mn<4+> ceramic prepared by the method has high purity and does not contain any impurity phase, the room-temperature multiferroic characteristic is greatly improved, and the Curie temperature is very high.

Description

technical field [0001] The invention relates to the field of electronic information component materials, in particular to a La 2 Ti 2 o 7 :Mn 4+ Multiferroic ceramics and methods for their preparation. Background technique [0002] With the advancement of science and technology, the requirements for device miniaturization are getting higher and higher, which requires the development of new materials with two or more functions at the same time, so as to develop new devices that can realize multiple functions at the same time. Multiferroic materials have both ferroelectric and ferromagnetic properties, so they can be coupled between electric polarization and magnetization to generate new functions, such as the magnetoelectric coupling effect, that is, the material produces ferroelectric polarization under an external magnetic field, or under an external electric field Produces the property of magnetic polarization. Such materials are expected to be used in sensors and new...

Claims

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Application Information

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IPC IPC(8): C04B35/50C04B35/622
Inventor 袁松柳黄丽珍邱洋席英
Owner HUAZHONG UNIV OF SCI & TECH
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