Interface coupling enhanced layered magnetoelectric composite ceramic and preparation method thereof

A magnetoelectric composite and interface coupling technology, which is applied in the field of layered magnetoelectric composite ceramics and its preparation, can solve the problems of low material density, abnormal grain growth at the interface, and unfavorable magnetoelectric coupling of layered magnetoelectric composite ceramic materials. Performance improvement and other issues, to achieve stable material performance, large polarization strength, and solve the effects of co-firing shrinkage mismatch

Inactive Publication Date: 2020-04-10
HUNAN INSTITUTE OF ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although researchers have used methods such as lowering the co-firing temperature, doping modification, and introducing a buffer layer to improve the interface coupling effect of the co-firing process to a certain extent, it is easy to cause low material density and abnormal grain growth at the interface. The emergence of new problems is not conducive to the improvement of the magnetoelectric coupling performance of layered magnetoelectric composite ceramic materials

Method used

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  • Interface coupling enhanced layered magnetoelectric composite ceramic and preparation method thereof
  • Interface coupling enhanced layered magnetoelectric composite ceramic and preparation method thereof
  • Interface coupling enhanced layered magnetoelectric composite ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] In this embodiment, the layered magnetoelectric composite ceramics with enhanced interfacial coupling is composed of piezoelectric phase Bi 0.5 Na 0.5 TiO 3 -xBi 0.5 K 0.5 TiO 3 and ferrite CoFe 2 o 4 Composition, where x is 0.2, ferrite CoFe 2 o 4 The volume fraction is 0.65.

[0055] Concrete preparation technological process is as follows:

[0056] (1) CoFe 2 o 4 Preparation of sol: Weigh 14.55g of cobalt nitrate hexahydrate (purity: 98.5%) and 40.4g iron nitrate nonahydrate (purity: 98.5%) according to Co:Fe stoichiometric ratio 1:2, dissolve in deionized water, add 36.17g EDTA (purity: 98%) and 7.94g citric acid (purity: 98%) were stirred to obtain a uniform mixed solution; then the pH value was adjusted to neutral with ammonia water, and the prepared solution was placed at a constant temperature of 90°C Heating in a water bath, stirring at 500r / min for 4h, to obtain stable and uniform CoFe 2 o 4 Sol;

[0057] (2)CoFe 2 o 4 The preparation of powde...

Embodiment 2

[0071]In this embodiment, the layered magnetoelectric composite ceramics with enhanced interfacial coupling is composed of piezoelectric phase Bi 0.5 Na 0.5 TiO 3 -xBi 0.5 K 0.5 TiO 3 and ferrite Co 0.6 Zn 0.4 Fe 2 o 4 Composition, where x is 0.2, ferrite Co 0.6 Zn 0.4 Fe 2 o 4 The volume fraction is 0.7.

[0072] Concrete preparation technological process is as follows:

[0073] (1)Co 0.6 Zn 0.4 Fe 2 o 4 The preparation of sol: according to Co:Zn:Fe stoichiometric ratio 3:2:10, weigh 8.73g cobalt nitrate hexahydrate (purity is 98.5%), 5.95g zinc nitrate hexahydrate (purity is 98.5%) and 40.4g nonahydrate Ferric nitrate (purity is 98.5%) is dissolved in deionized water, adds 37.33g ethylenediaminetetraacetic acid (purity is 98%) and 7.17g citric acid (purity is 98%), stirs, obtains uniform mixed liquid; Then with ammonia water Adjust the pH value to neutral, heat the obtained solution in a water bath with a constant temperature of 85°C, and stir at 600r / min f...

Embodiment 3

[0083] In this embodiment, the layered magnetoelectric composite ceramics with enhanced interfacial coupling is composed of piezoelectric phase Bi 0.5 Na 0.5 TiO 3 -xBi 0.5 K 0.5 TiO 3 and ferrite NiFe 2 o 4 Composition, where x is 0.18, ferrite NiFe 2 o 4 The volume fraction of is 0.67.

[0084] Concrete preparation technological process is as follows:

[0085] (1)NiFe 2 o 4 Preparation of sol: Weigh 14.53g nickel nitrate hexahydrate (purity 98.5%) and 40.4g iron nitrate nonahydrate (purity 98.5%) according to Ni:Fe stoichiometric ratio 1:2, dissolve in deionized water, add 36.82g EDTA (purity: 98%) and 8.01g citric acid (purity: 98%) were stirred to obtain a uniform mixed solution; then the pH value was adjusted to neutral with ammonia water, and the prepared solution was placed at a constant temperature of 90°C Heating in a water bath, stirring at 700r / min for 4h, to obtain stable and uniform NiFe 2 o 4 Sol;

[0086] (2)NiFe 2 o 4 The preparation of powder:...

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Abstract

The invention discloses interface coupling enhanced layered magnetoelectric composite ceramic and a preparation method thereof. The layered magnetoelectric composite ceramic is formed by laminating, co-firing and compounding a modified Bi0. 5Na0. 5TiO3-based piezoelectric phase and a spinel ferrite magnetostrictive phase. The invention also comprises a preparation method of the composite magnetoelectric ceramic. The layered magnetoelectric composite ceramic has good piezoelectric property, magnetostriction property and high magnetoelectric voltage coefficient and is simple in preparation process, stable in performance, environment-friendly and harmless and is suitable for the field of electronic devices such as magnetoelectric sensors, energy collectors and filters.

Description

technical field [0001] The invention relates to a multifunctional composite ceramic material and a preparation method thereof, in particular to a layered magnetoelectric composite ceramic with enhanced interface coupling and a preparation method thereof. Background technique [0002] With the rapid development of information technology, single-functional materials are difficult to meet the needs of miniaturization and multi-functionalization of new electronic components, and the development of multi-functional materials has become a research hotspot. Magnetoelectric functional ceramic materials not only have all the characteristics of a single ferroelectric material and ferromagnetic material, but also have the magnetoelectric effect generated by the coupling of electrical order and magnetic order, making it suitable for magnetic or electric field sensors, magnetoelectric storage units, Electronic materials and devices such as energy harvesting devices and microwave devices ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/32C04B35/34C04B35/28C04B35/622C04B35/64
CPCC04B35/265C04B35/2666C04B35/475C04B35/622C04B35/64C04B2235/3201C04B2235/3234C04B2235/3275C04B2235/3279C04B2235/3284C04B2235/3298C04B2235/656C04B2235/6567C04B2235/765C04B2235/766C04B2235/768C04B2235/96
Inventor 刘胜颜铄清邹鸿翔贺君
Owner HUNAN INSTITUTE OF ENGINEERING
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