Co-doped multiferroic ceramic with Aurivillius structure and preparation method thereof

A technology of multiferroic ceramics and doping amount, applied in the field of multiferroic ceramic materials, can solve the problems of inconspicuous transition metal doping and impurity generation, achieve uniform grain size, enhance magnetic properties, and speed up production cycle. Effect

Active Publication Date: 2019-01-01
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this kind of doping will also bring many disadvantages, such as being limited by solid solubility, excessive doping will produce impurity phases, and single transition metal doping is not obvious in improving magnetic properties.

Method used

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  • Co-doped multiferroic ceramic with Aurivillius structure and preparation method thereof
  • Co-doped multiferroic ceramic with Aurivillius structure and preparation method thereof
  • Co-doped multiferroic ceramic with Aurivillius structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The chemical formula of the single-phase multiferroic ceramic material is: SrBi 2 Nb 1.8-x Fe 0.2 co x o 8.8-x , where x represents the mole percentage, and x=0.

[0031] The aforementioned Co-doped SrBi 2 Nb 1.8 Fe 0.2 o 8.8 The preparation method of ferroceramic material comprises the following steps:

[0032] (1) According to the chemical formula SrBi 2 Nb 1.8 Fe 0.2 o 8.8 SrCO 3 、 Bi 2 o 3 , Nb 2 o 5 , Fe 2 o 3 and Co 2 o 3 After preparation, it is mixed evenly by ball milling, then dried, sieved, and passed through 800 o C pre-burned for 4 hours to obtain block solid;

[0033] (2) After pulverizing the blocky solid, ball milling is carried out again, and the product is sieved to obtain SrBi with uniform size 2 Nb 1.8 Fe 0.2 o 8.8 body;

[0034] (3) will get SrBi 2 Nb 1.8 Fe 0.2 o 8.8 Body, weighed at 0.4g per portion, then poured into the mold, applied a force of 600N, and demoulded the formed disc to obtain a sample with a good shape; ...

Embodiment 2

[0043] The chemical formula of the single-phase multiferroic ceramic material is: SrBi 2 Nb 1.8-x Fe 0.2 co x o 8.8-x , where x represents the mole percentage, and x=0.1.

[0044] The aforementioned Co-doped SrBi 2 Nb 1.8 Fe 0.2 o 8.8 The preparation method of ferroceramic material comprises the following steps:

[0045] (1) According to the chemical formula SrBi 2 Nb 1.7 Fe 0.2 co 0.1 o 8.7 SrCO 3 、 Bi 2 o 3 , Nb 2 o 5 , Fe 2 o 3 and Co 2 o 3 After preparation, it is mixed evenly by ball milling, then dried, sieved, and passed through 800 o C pre-burned for 4 hours to obtain block solid;

[0046] (2) After pulverizing the blocky solid, ball milling is carried out again, and the product is sieved to obtain SrBi with uniform size 2 Nb 1.7 Fe 0.2 co 0.1 o 8.7 body;

[0047] (3) will get SrBi 2 Nb 1.7 Fe 0.2 co 0.1 o 8.7 Body, weighed at 0.4g per portion, then poured into the mold, applied a force of 600N, and demoulded the formed disc to obtain ...

Embodiment 3

[0056] The chemical formula of the single-phase multiferroic ceramic material is: SrBi 2 Nb 1.8-x Fe 0.2 co x o 8.8-x , where x represents the mole percentage, and x=0.2.

[0057] The aforementioned Co-doped SrBi 2 Nb 1.6 Fe 0.2 o 8.8 A preparation method for a ceramic material comprising the following steps:

[0058] (1) According to the chemical formula SrBi 2 Nb 1.6 Fe 0.2 co 0.2 o 8.6 SrCO 3 、 Bi 2 o 3 , Nb 2 o 5 , Fe 2 o 3 and Co 2 o 3 After preparation, it is mixed evenly by ball milling, then dried, sieved, and passed through 800 o C pre-burned for 4 hours to obtain block solid;

[0059] (2) After pulverizing the blocky solid, ball milling is carried out again, and the product is sieved to obtain SrBi with uniform size 2 Nb 1.6 Fe 0.2 co0.2 o 8.6 body;

[0060] (3) will get SrBi 2 Nb 1.6 Fe 0.2 co 0.2 o 8.6 Body, weighed at 0.4g per portion, then poured into the mold, applied a force of 600N, and demoulded the formed disc to obtain a sam...

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Abstract

The invention provides a novel Co-doped SrBi2Nb1.8Fe0.2O8.8 multiferroic ceramic material. The invention further provides a preparation method for the ceramic material, which comprises the following steps: SrCO3, Bi2O3, Nb2O5, Fe2O3 and Co2O3 are respectively adopted as materials for preparation; the powder is ball-milled, presintered at 750 DEG C to 850 DEG C for 3 to 5 hours, screening and shaping are carried out, and finally, after sintering is performed for 2 to 4 hours at the temperature of 995 DEG C to 1080 DEG C, the single-phase SrBi2Nb1.8-xFe0.2O8.8-x multiferroic ceramic material with an Aurivillius structure is obtained. The preparation process of the single-phase multiferroic Aurivillius compound ceramic material prepared by the method is simple, the materials are cheap, and the production cost is low. After the doping of Co ions, because more double exchange interaction is introduced, the material is changed from a weak antiferromagnetic material at room temperature into aferromagnetic material.

Description

technical field [0001] The invention belongs to the technical field of multiferroic ceramic materials, and relates to a novel Co-doped SrBi 2 Nb 1.8 Fe 0.2 o 8.8 Multiferroic ceramic material with Oliveris structure and its preparation method. Background technique [0002] In recent years, with the rapid rise and rapid development of the electronic information industry, people have put forward higher requirements for the integration and multi-function of devices; at the same time, due to the explosive growth of data information, high-speed, large-capacity Information storage medium materials have gradually become a hot field of research and exploration in the industry. Multiferroic materials are such multifunctional materials that can be used in the field of high-density storage. They usually have two or more properties of ferroelectricity, ferromagnetism and ferroelasticity at the same time, and can realize ferroelectric order. Coupling and mutual regulation with ferro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/622
CPCC04B35/453C04B35/622C04B2235/3213C04B2235/3251C04B2235/3272C04B2235/3275C04B2235/3298
Inventor 蒲永平师裕张倩雯王雯李经纬彭鑫张磊
Owner SHAANXI UNIV OF SCI & TECH
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