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Multiferroic rare earth doped ferrate materials and preparation method thereof

A rare earth doping, multiferroic technology, applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., to achieve the effects of excellent product performance, mild synthesis conditions, and convenient control

Inactive Publication Date: 2012-06-20
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In contrast, rare earth-doped spinel-type ferrite compounds have been less studied

Method used

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  • Multiferroic rare earth doped ferrate materials and preparation method thereof
  • Multiferroic rare earth doped ferrate materials and preparation method thereof
  • Multiferroic rare earth doped ferrate materials and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Take 20mmol of FeCl 3 , added to a 30ml reaction kettle, and 20mmol of LaCl was added to the kettle 3 and 20mmol of ZnCl 2 , at this time La 3+ and Fe 3+ The molar ratio is 1:1; then add 20ml of ethylene glycol solution to the kettle, and after magnetically stirring to dissolve, add 1g of potassium acetate and 1g of polyethylene glycol 4000, and continue to stir until completely dissolved; heat at 250°C for 24 hours, The resulting black precipitate is washed with deionized water and dried between 40°C and 80°C to obtain spinel-type ZnFeLaO with a particle size of 0.02-5 microns 4 multiferrous compounds.

Embodiment 2

[0042] Experimental method is the same as embodiment 1, but the reaction proportion is different, FeCl 3 Change to 19mmol, LaCl 3 Change to 1mmol, ZnCl 2 Change it to 10mmol to obtain spinel ZnFe with a particle size of 0.02-5 microns 1.9 La 0.1 o 4 multiferrous compounds. (powder XRD diffraction of samples see figure 1 a, Scanning electron microscope see figure 2 , hysteresis loop see Figure 7 , indicating that ZnFe 1.9 La 0.1 o 4 It is a compound with spinel structure, the particle appearance is spherical, and has ferromagnetic properties. )

Embodiment 3

[0044] The experimental method is the same as in Example 1, except that the reaction ratio is different, and the control La 3+ with Fe 3+The molar ratio is 0.2:1.8, that is, spinel-type ZnFe with a particle size of 0.02-5 microns can be obtained 1.8 La 0.2 o 4 multiferrous compounds.

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Abstract

The invention relates to multiferroic rare earth doped ferrate materials and a preparation method thereof, and belongs to the technical fields of multiferroic materials and preparation processes. The general formula of the materials is ZnFe(2-x)MxO4, ZnFe(2-y)MxM'(y-x)O4, Zn(1-y)M'yFe(2-x)MxO4 or Zn(1-z)M''zFe(2-y)MxM'(y-x)O4. According to the method, a soluble ferric ion salt, a divalent metal ion salt, an alkali metal salt and one or a plurality of soluble trivalent rare earth ion salts are adopted as reactants, a series of tweens, a series of polyethylene glycol, and other compounds are adopted as template agents, and a solvothermal reaction is performed in an organic polar solvent system in a sealed container at a temperature of about 160-260 DEG C to obtain a series of the rare earth doped ferrate compounds with performances of magnetism and ferroelectricity at the room temperature. The method of the present invention has characteristics of cheap and easily obtained raw materials, simple equipment, easy achievement of control, good process repeatability, stable product quality, and safe and reliable operation.

Description

technical field [0001] The invention relates to a series of rare earth-doped multiferroic ferrite materials and a preparation method thereof, belonging to the technical field of multiferroic materials and preparation techniques. Background technique [0002] Multiferroic materials can realize the control and reversal of the polarization vector by the external magnetic field and the magnetization vector by the external electric field, making it possible to store magnetic (ferroelectric) data controlled by the electric field (magnetic field), which greatly expands the application of multiferroic materials. Therefore, it has become a research hotspot in the field of international functional materials. [0003] However, the single-phase multiferroic materials discovered since the advent of the first ferroelectromagnet have low uniform Nier temperature, mostly around 100K, and the magnetoelectric response is small, and the magnetoelectric effect decreases rapidly with the incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00
Inventor 刘琦杨丹丹王利娟郭雪程美令吴玉娟
Owner CHANGZHOU UNIV
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