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Method for preparing BiFeO3 based multiferroic composite material

A composite material and synthesis process technology, applied in the field of material science, can solve the problem of small macroscopic magnetic moment, achieve the effects of short sintering time, uniform and dense sample structure, and low cost

Inactive Publication Date: 2010-06-09
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two methods can prepare single-phase ceramic samples. Although the former has better ferroelectric properties, its disadvantage is that the macroscopic magnetic moment is very small; although the latter has obtained a relatively large macroscopic magnetic moment, its The leakage phenomenon of the sample is very obvious

Method used

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  • Method for preparing BiFeO3 based multiferroic composite material
  • Method for preparing BiFeO3 based multiferroic composite material
  • Method for preparing BiFeO3 based multiferroic composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] According to the theoretical chemical formula Bi 0.8 Dy 0.2 Fe 0.98 Ti 0.02 o 3.01 Weigh 0.04mol Bi respectively 2 o 3 , 0.01mol Dy 2 o 3 , 0.049molFe 2 o 3 and 0.002mol TiO 2 , and fully grind it in an agate mortar or ball mill for about 1 hour, and mix evenly; press the above mixture into tablets with a tablet machine, and then pretreat the pressed tablets in a tube furnace or a box furnace at a temperature of 600°C, the treatment time is one hour, and then cooled to room temperature with the furnace; the pretreated sheet samples are then placed in an agate mortar or ball mill to fully pulverize and grind for about 1 hour, and then pressed into tablets again. Finally, the second sintering is carried out. The sintering temperature is 880°C and the sintering time is 20min. Take out and anneal at room temperature. figure 1 is the X-ray diffraction pattern (XRD) of the composite material, indicating that the main phase of the composite material is an orthorhom...

Embodiment 2

[0017] According to the theoretical chemical formula Bi 0.8 Dy 0.2 Fe 0.99 Ti 0.01 o 3.005 Weigh 0.04mol Bi respectively 2 o 3 , 0.01mol Dy 2 o 3 , 0.0495molFe 2 o 3 and 0.001mol TiO 2 , and fully grind it in an agate mortar or ball mill for about 1 hour, and mix evenly; press the above mixture into tablets with a tablet machine, and then pretreat the pressed tablets in a tube furnace or a box furnace at a temperature of 600°C, the treatment time is one hour, and then cooled to room temperature with the furnace; the pretreated sheet samples are then placed in an agate mortar or ball mill to fully pulverize and grind for about 1 hour, and then pressed into tablets again. Finally, the second sintering is carried out. The sintering temperature is 850°C, and the sintering time is about 20 minutes. Take it out and anneal at room temperature to get the BiFeO 3 based multiferroic composites.

Embodiment 3

[0019] According to the theoretical chemical formula Bi 0.8 Dy 0.2 Fe 0.97 Ti 0.03 o 3.015 Weigh 0.04mol Bi respectively 2 o 3 , 0.01mol Dy 2 o 3 , 0.0485molFe 2 o 3 and 0.003mol TiO 2 , and fully grind it in an agate mortar or ball mill for about 1 hour and mix evenly; press the above mixture into tablets with a tablet machine, and then pretreat the pressed tablets in a tube furnace or a box furnace at a temperature of 600 °C, the treatment time is one hour, and then cooled to room temperature with the furnace; the pretreated flake samples are then placed in an agate mortar or ball mill to fully pulverize and grind for about 1 hour, and then compressed into flakes again. Finally, the second sintering is carried out. The sintering temperature is 900°C, and the sintering time is about 20 minutes. Take it out and anneal at room temperature to get the BiFeO 3 based multiferroic composites.

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Abstract

The invention discloses a method for preparing a BiFeO3 based multiferroic composite material. Positions of a Bi element and a Fe element are simultaneously doped with dysprosium and titanium in different ratios, and a ferrimagnetic garnet minor phase is generated in the finally obtained sample through autonomous induction so as to form the multiferroic composite material. The method for preparing the material comprises the following steps: weighing bismuth oxide, ferric oxide, dysprosia and titanium dioxide powder in a certain ratio, fully mixing and grinding uniformly, tabletting, roasting in a tube furnace or chamber furnace at 650 DEG C for one hour, and cooling along with the furnace to room temperature; and secondarily grinding and tabletting the obtained product, sintering in the tube furnace again at different temperatures from 820 to 970 DEG C according to different component ratios for about 20 minutes by a method similar to rapid sintering, and preparing the compact block multiferroic composite material. Simultaneously, the dysprosium element is replaced by a gadolinium element, and the BiFeO3 based multiferroic composite material with improved ferroelectricity and magnetism can also be obtained.

Description

technical field [0001] The invention belongs to the field of material science and relates to BiFeO 3 The preparation technology of base multiferroic composite material, especially relates to the preparation method of co-doping of two elements dysprosium and titanium to prepare multiferroic composite material. Background technique [0002] Due to the coexistence of ferroelectricity and magnetism, the multiferroic composite material can be induced by an electric field to generate a magnetic field, and the magnetic field can also induce electric polarization. This property is called the magnetoelectric effect. The material complements the deficiencies of pure (anti) ferroelectric or (anti) ferromagnetic materials, and simultaneously presents a double order of ferroelectric properties and ferromagnetic properties or other forms of magnetic properties. This dual order makes multiferroic composites have some unique physical properties; and it has good application potential in mul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/622
Inventor 张书霞王栋梁马衍伟
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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