Gradient multiferroic material and preparation method thereof

A technology of multiferroic materials and ferroelectric materials, applied in the field of gradient multiferroic materials, can solve problems such as fatigue, easy falling off, pollution, etc., achieve strong magnetoelectric coupling effect, strong high temperature stability, and solve the effects of easy delamination

Inactive Publication Date: 2011-09-28
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, multiferroic materials were generally bonded together with ferroelectric phase and ferromagnetic phase during production, and were affected by complex humid and hot environments, which were easy to fall off, fatigue, delaminate, and age, and were not suitable for long-term use. It is greatly restricted, and it is easy to decompose in a high temperature environment and cause great pollution

Method used

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  • Gradient multiferroic material and preparation method thereof
  • Gradient multiferroic material and preparation method thereof
  • Gradient multiferroic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Nb-SrTiO 3 and Ni 2 MnGa is mixed according to the ratio of 12% and 79%, and then add 9% BaTiO 3 , through ball milling to 105-232 mesh, of which 135-201 mesh accounts for 55%; after mixing evenly, at 1570kg / cm 2 Under pressure, press into an embryo body, in an argon protective atmosphere, microwave sintering for 1.5 hours, heat to 1480°C, keep warm for 3 hours, and take out the sample after cooling. The magnetoelectric effect of the material was measured by the resonant cavity perturbation method, and the ferroelectricity, ferromagnetism and carrying capacity were evaluated by referring to relevant standards.

[0013] After testing, the bearing characteristics of the gradient multiferroic material are as follows: the coefficient of thermal expansion at high temperature is 2.3×10 -6 / ℃, the high temperature flexural strength is 9.7MPa, and the dielectric constant is 8.2.

Embodiment 2

[0015] Nb-SrTiO 3 and Ni 2 MnGa is mixed according to the ratio of 61% and 32%, and 7% BaTiO is added 3 , through ball milling to 121-257 meshes, of which 136-231 meshes accounted for 55%. After mixing evenly, in an argon protective atmosphere, at 1420kg / cm 2 Under pressure, after microwave sintering for 1.5 hours, it was heated to 1610° C., kept for 3 hours, and the sample was taken out after cooling. The magnetoelectric effect of the material was measured by the resonant cavity perturbation method, and the ferroelectricity, ferromagnetism and carrying capacity were evaluated by referring to relevant standards.

[0016] After testing, the bearing capacity of the gradient multiferroic material is as follows: the coefficient of thermal expansion at high temperature is 1.9×10 -6 / °C, the high temperature flexural strength is 10.9MPa, and the dielectric constant is 7.5.

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Abstract

The invention relates to a gradient multiferroic material with good ferroelectricity and ferromagnetism and strong magnetoelectric coupling effect and a preparation method thereof. The material is characterized in that: the material comprises a ferroelectric material Nb-SrTiO3 and Ni2MnGa alloy ferromagnetic inclusion particles distributed in a gradient mode. The gradient multiferroic material prepared in the present invention has a stronger bearing capability than bearing capabilities of like gradient materials, has the advantages of simple preparation technology and good magnetoelectric effect, and has large application values in the electromagnetic fields of memories, actuators, transmitters and the like and important functions on researching intelligent materials and structures thereof and multi-field coupling materials.

Description

technical field [0001] The invention relates to a gradient multiferroic material with good ferroelectricity, ferromagnetism and strong magnetoelectric coupling effect and its preparation method. Background technique [0002] In the field of modern engineering technology of light weight and miniaturization of electronic devices, there is an increasingly urgent need for materials with multiple functions at the same time. Gradient multiferroic materials not only have ferroelectric and ferromagnetic properties, but also have magnetoelectric coupling effect, which greatly expands the application range of gradient materials. The magnetoelectric effect refers to the electric polarization caused by the applied magnetic field, or the magnetic polarization effect caused by the applied electric field, which provides technical support for information storage microdevices. In the past, multiferroic materials were generally bonded together with ferroelectric phase and ferromagnetic phase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/00C22C1/05
Inventor 李永舒畅
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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