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Lead-free Bi0.5Na0.5TiO3-based magnetoelectric composite ceramic and preparation method thereof

A technology of magnetoelectric composite and composite ceramics, which is applied in the field of lead-free Bi0.5Na0.5TiO3-based magnetoelectric composite ceramics and its preparation, and can solve the problems of reducing the coupling performance of magnetoelectric materials, adverse magnetoelectric conversion effects, and harm to human health. , to achieve the effect of increasing the magnetic-mechanical-electric coupling performance, excellent environmental coordination, and large polarization strength

Active Publication Date: 2017-11-24
CENT SOUTH UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Magnetoelectric composite ceramic materials are composed of piezoelectric phase (ferroelectric) and magnetostrictive phase. In recent years, most studies have used lead-containing piezoelectric ceramics as the piezoelectric phase, including PbZrO 3 -PbTiO 3 , Pb(Mg 1 / 3 Nb 2 / 3 )O 3 -PbTiO 3 ,Pb(Zn 1 / 3 Nb 2 / 3 )O 3 -PbTiO 3 and Pb(Fe 1 / 2 Nb 1 / 2 )O 3 -PbTiO 3 etc.; although lead-containing piezoelectric ceramics can produce huge piezoelectric response and electromechanical resonance effect, they produce substances harmful to the environment in the process of preparation and use, causing harm to human health and aggravating environmental pollution
[0004] The preparation of traditional particle (0-3) type composite magnetoelectric ceramic materials mostly adopts mechanical mixing to directly mix the piezoelectric phase and the magnetostrictive phase. This process easily leads to uneven distribution of the two phases, and the low resistance magnetostrictive phase is connected and Leakage current is generated, which reduces the coupling performance of magnetoelectric materials and is not conducive to the generation of magnetoelectric conversion effects

Method used

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  • Lead-free Bi0.5Na0.5TiO3-based magnetoelectric composite ceramic and preparation method thereof
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  • Lead-free Bi0.5Na0.5TiO3-based magnetoelectric composite ceramic and preparation method thereof

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Experimental program
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Embodiment 1

[0028] Lead-free Bi 0.5 Na 0.5 TiO 3 The chemical composition of the base magnetoelectric composite ceramics is: (1-z)[(1-x)Bi 0.5 Na 0.5 TiO 3 -xBi 0.5 K 0.5 TiO 3 ]-zNi 0.8 Zn 0.2 Fe 2 o 4 , where x=0.18, z=0.35. Concrete preparation technological process is as follows:

[0029] 1)Ni 0.8 Zn 0.2 Fe 2 o 4 The preparation of the ferrite ferromagnetic phase: first weigh a certain amount of Ni(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O and Zn(NO 3 ) 2 ·6H 2O was dissolved in an appropriate amount of deionized water, and fully stirred to form a transparent solution; then weighed a certain amount of complexing agent ethylenediaminetetraacetic acid, which was 1.2 times the total molar amount of cations in the composite solution, and added it to the composite solution. solution, and adjust its pH value to 7 with ammonia water, stir evenly until a transparent solution is formed, then place it in a water bath with a constant temperature of 85°C and heat and stir for ...

Embodiment 2

[0037] Lead-free Bi 0.5 Na 0.5 TiO 3 The chemical composition of the base magnetoelectric composite ceramics is: (1-z)[(1-y)Bi 0.5 Na 0.5 TiO 3 -yBaTiO 3 ]-zCoFe 2 o 4 , where y=0.06, z=0.3. Concrete preparation technological process is as follows:

[0038] 1) CoFe 2 o 4 Preparation of ferrite ferromagnetic phase: first weigh a certain amount of Co(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 9H 2 O was dissolved in an appropriate amount of deionized water, and fully stirred to form a transparent solution; then weighed a certain amount of complexing agents ethylenediaminetetraacetic acid and citric acid, and the mixing molar ratio of ethylenediaminetetraacetic acid and citric acid was 3:1 , the total amount of complexing agent is 1.4 times the total molar amount of cations in the composite solution, and it is added to the composite solution, and its pH value is adjusted to 7 with ammonia water, stirred evenly until a transparent solution is formed, and then placed at a con...

Embodiment 3

[0045] Lead-free Bi 0.5 Na 0.5 TiO 3 The chemical composition of the base magnetoelectric composite ceramics is: (1-z)[(1-y)Bi 0.5 Na 0.5 TiO 3 -yBaTiO 3 ]-zNiFe 2 o 4 , where y=0.08, z=0.2. Concrete preparation technological process is as follows:

[0046] 1) NiFe 2 o 4 The preparation of the ferrite ferromagnetic phase: first weigh a certain amount of Ni(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 9H 2 O was dissolved in an appropriate amount of deionized water, and fully stirred to prepare a transparent solution; then weighed a certain amount of complexing agents ethylenediaminetetraacetic acid and citric acid, and the mixing molar ratio of ethylenediaminetetraacetic acid and citric acid was 4:1 , the total amount of complexing agent is 1.3 times the total molar amount of cations in the composite solution, and it is added to the composite solution, adjusted to pH 7 with ammonia water, stirred evenly until a transparent solution is formed, and then placed at a constant ...

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Abstract

The invention discloses lead-free Bi0.5Na0.5TiO3-based magnetoelectric composite ceramic and a preparation method thereof. The lead-free Bi0.5Na0.5TiO3-based magnetoelectric composite ceramic is prepared from a modified Bi0.5Na0.5TiO3-based ferroelectric phase and spinel ferrite ferromagnetic phase through compounding, wherein a molar ratio range of the spinel ferrite ferromagnetic phase is 0.2 to 0.4. The preparation method of the lead-free Bi0.5Na0.5TiO3-based magnetoelectric composite ceramic adopts a modified sol-gel preparation technology and is characterized by soaking ferrite ferromagnetic phase particles into a ferroelectric precursor solution, heating and stirring, thus forming a ferroelectric sol coated ferromagnetic particle composite precursor; carrying out secondary presintering after drying, thus obtaining two-phase composite powder; pressing and then sintering the powder, thus obtaining the composite ceramic. Lead-free magnetoelectric composite ceramic particles prepared by the invention are uniform in dispersion, high in electrical resistivity, large in piezoelectric response and strong in magnetoelectric coupling performance. The lead-free Bi0.5Na0.5TiO3-based magnetoelectric composite ceramic is high in magnetoelectric energy conversion efficiency and simple in preparation technology, is environmentally friendly and harmless, and can be used in the fields of electronic devices such as a sensitive magnetoelectric sensor, an energy converter and a filter.

Description

technical field [0001] The invention belongs to the technical field of functional materials and their preparation, in particular to a lead-free Bi 0.5 Na 0.5 TiO 3 Base magnetoelectric composite ceramics and preparation method thereof. Background technique [0002] With the rapid development of information technology, single-functional materials are difficult to meet the miniaturization and multi-functional requirements 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 produced by ferroelectric and ferromagnetic coupling, making it suitable for magnetic or electric field sensors, magnetoelectric storage elements, magnetoelectric Electronic materials and devices such as transformers and microwave devices have great application pr...

Claims

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Application Information

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IPC IPC(8): C04B35/475C04B35/624C04B35/628
CPCC04B35/475C04B35/624C04B35/62818C04B2235/3201C04B2235/3274C04B2235/3279C04B2235/3284
Inventor 邓联文刘胜廖聪维颜铄清黄生祥贺君
Owner CENT SOUTH UNIV
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