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Multiferroic liquid and preparation method thereof

A multiferroic, liquid technology, used in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve the problems of weak effect, insignificant change, large coercive force, and inability to change, to broaden the scope of research and preparation methods. simple effect

Inactive Publication Date: 2015-11-04
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

Even so, the multiferroic materials studied at present are all solid, including multiferroic ceramics, multiferroic thin films, multiferroic single crystals, etc.; solid multiferroic materials have the following deficiencies: 1. The correction of solid multiferroic materials The coercive force is relatively large. When using a magnetic field or an electric field to regulate magnetism or ferroelectricity, the required magnetic field or electric field is relatively large; 2. When studying the magnetoelectric coupling effect, it is found that the effect is relatively weak and the change is not obvious ; 3. Applying too much electric field will easily damage the multiferroic material, resulting in material waste; 4. Once the multiferroic material is formed, it cannot be changed

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  • Multiferroic liquid and preparation method thereof
  • Multiferroic liquid and preparation method thereof
  • Multiferroic liquid and preparation method thereof

Examples

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example 1

[0031] Example 1: Bismuth ferrite (BiFeO 3 , referred to as BFO) the preparation of multiferroic liquid

[0032] Step 1: Preparation of multiferroic BFO nanoparticles by sol-gel method:

[0033]Measure ethylene glycol methyl ether and glacial acetic acid solution as a mixed solvent, the volume ratio of the two is 1:1, 25ml each. 15.36 g of bismuth nitrate and 12.3045 g of iron nitrate were dissolved in the mixed solvent. Stir magnetically until it is completely dissolved, then add 20ml acetic anhydride dropwise to remove crystal water, add 14g citric acid as a chelating agent after the solution is completely cooled, stir for 24 hours, then add 40 drops of ethanolamine to pH 1-1.2 of the solution, and stir for 1 hour Make up to volume with ethylene glycol methyl ether, and transfer the solution to a jar. Then the obtained solution was baked on a heating platform, and then put into a box furnace for sintering at a temperature of 600° C. for 2 hours. After the obtained produc...

example 2

[0038] Example 2: bismuth manganate (BiMnO 3 , referred to as BMO) preparation of multiferroic liquid

[0039] Step 1: Preparation of Ferroelectric BMO Nanoparticles by Solid State Reaction

[0040] Raw material Bi 2 o 3 , MnO 2 , Calculate the required mass of each raw material according to the ratio of atomic molar ratio Bi:Mn=1:1 and the purity of the raw materials, and grind them sufficiently to make them evenly mixed. Then put the above powder into a cleaned crucible and place it in a muffle furnace, and pre-fire it for the first time at 900°C for 10 hours to form a preliminary phase. The obtained product is fully ground and then calcined at 1100°C for 30 hours to completely react the raw materials. The third time of full grinding is carried out to obtain BMO nanoparticles.

[0041] Step 2: Prepare BMO Multiferroic Liquid:

[0042] A certain mass of BMO nanoparticles is evenly dispersed in a certain concentration of silicone oil. Silicone oil has the characteristi...

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Abstract

The invention discloses a multiferroic liquid. The multiferroic liquid is a stable suspension liquid obtained by uniform dispersion of multiferroic nano-particles in a uniform mixed solution of a base liquid and a surfactant. The preparation method of the multiferroic liquid comprises pouring dry multiferroic nano-particles into a mixed solution of a base liquid and a surfactant in a container, sealing the container, putting the sealed container into a shaking table and carrying out shaking to obtain a stable multiferroic liquid. Compared with the solid multiferroic material, the multiferroic liquid has ferroelectricity, magnetism, fluidity, unique magneto-optic effect and optical direfringence effect, electric field (magnetic field) sensibility, and strong magnetoelectric effect. Through application of a small electric field (magnetic field), ferroelectricity and magnetism of the multiferroic liquid can be adjusted and controlled. Multiferroic nano-particles of the multiferroic liquid can easily rotate in the electric field (magnetic field) so that an electric domain direction is completely along an electric field direction. The multiferroic liquid provides a novel research direction of a multiferroic material and has a good application prospect.

Description

technical field [0001] The invention belongs to the field of multiferroic materials, and in particular relates to a multiferroic liquid and a preparation method thereof. Background technique [0002] In 1994, Schmid in Switzerland clearly proposed the concept of multiferroic materials. Multiferroic materials (mutliferroic) refer to the basic properties of two or more types of iron in the same phase of the material. These basic properties of iron include iron Electricity (antiferroelectricity), ferromagnetism (antiferromagnetism, ferrimagnetism) and ferroelasticity. This kind of material has both spontaneous polarization order and spin order at a certain temperature. It is the magnetoelectric coupling effect caused by their simultaneous existence that makes multiferroics have some special physical properties and triggers several new , Significant physical phenomena, such as: generating electric polarization or inducing ferroelectric phase transition under the action of a mag...

Claims

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Application Information

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IPC IPC(8): C01G49/00
Inventor 高荣礼符春林蔡苇陈刚邓小玲
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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