Preparation method of bismuth ferrite-based composite material with high ferromagnetic and ferroelectric properties

A technology of ferroelectric properties and composite materials, applied in the field of material science, can solve the problems of low resistivity, large leakage conduction current and weak magnetism, and limit the practical application of bismuth ferrite materials, and achieve the goal of improving shape and increasing remanent polarization strength Effect

Inactive Publication Date: 2013-07-24
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

However, the disadvantages of bismuth ferrite are large leakage conduction current due to the presence of ferrous ions and oxygen vacancies and weak magnetism due to the antiferroelectric nature
The above shortcomings severely limit the practical application of bismuth ferrite materials
Although ion doping can reduce the leakage current of bismuth ferrite ceramics and improve the magnetic properties of bismuth ferrite ceramics to a certain extent, the effect of modification is not very obvious, especially in improving the magnetic properties of bismuth ferrite ceramics, because Ion doping does not change the antiferromagnetic nature of bismuth ferrite
The introduction of strong magnetic ferrites in bismuth ferrite ceramics can significantly improve, however, due to the commonly used cobalt ferrite (CoFe 2 o 4 ) and NiZn ferrite (NiZn ferrite) have low resistivity. If these two ferrites are introduced into bismuth ferrite to form a bismuth ferrite-based composite material, although the magnetic properties of bismuth ferrite ceramics can be improved, But it will deteriorate the ferroelectricity of bismuth ferrite ceramics

Method used

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  • Preparation method of bismuth ferrite-based composite material with high ferromagnetic and ferroelectric properties
  • Preparation method of bismuth ferrite-based composite material with high ferromagnetic and ferroelectric properties
  • Preparation method of bismuth ferrite-based composite material with high ferromagnetic and ferroelectric properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: 1) by chemical general formula BiY 2 Fe 5 o 12 Analytical pure Bi(NO 3 ) 3 ·5H 2 O, Y (NO 3 ) 3 ·5H 2 O and Fe(NO 3 ) 3 9H 2 O is dissolved in ethylene glycol to make transparent BiY with a concentration of 0.2mol / l 2 Fe 5 o 12 Sol;

[0023] 2) According to the general chemical formula La 0.1 Bi 0.9 FeO 3 Analytical pure La 2 o 3 , Bi 2 o 3 and Fe 2 o 3 After preparation, ball mill for 4 hours, then dry, sieve, briquette, pre-fire at 800°C for 3 hours, then crush the obtained block sample and pass through a 120-mesh sieve to obtain La 0.1 Bi 0.9 FeO 3 Powder;

[0024] 3) According to the general chemical formula x BiY 2 Fe 5 o 12 / (1-x)La 0.1 Bi 0.9 FeO 3 BiY 2 Fe 5 o 12 Sol and La 0.1 Bi 0.9 FeO 3 The powder is mixed evenly to obtain a slurry, where x is BiY 2 Fe 5 o12 The mass percentage of x=0.05;

[0025] 4) Insulate and heat-treat the above uniformly mixed slurry at 80°C, 200°C and 400°C for 2 hours to obtain mi...

Embodiment 2

[0029] Embodiment 2: 1) by chemical general formula BiY 2 Fe 5 o 12 Analytical pure Bi(NO 3 ) 3 ·5H 2 O, Y (NO 3 ) 3 ·5H 2 O and Fe(NO 3 ) 3 9H 2 O is dissolved in ethylene glycol to make transparent BiY with a concentration of 0.4mol / l 2 Fe 5 o 12 Sol;

[0030] 2) According to the general chemical formula La 0.1 Bi 0.9 FeO 3 Analytical pure La 2 o 3 , Bi 2 o 3 and Fe 2 o 3 After preparation, ball mill for 4 hours, then dry, sieve, briquette, pre-fire at 800°C for 3 hours, then crush the obtained block sample and pass through a 120-mesh sieve to obtain La 0.1 Bi 0.9 FeO 3 Powder;

[0031] 3) According to the general chemical formula x BiY 2 Fe 5 o 12 / (1-x)La 0.1 Bi 0.9 FeO 3 BiY 2 Fe 5 o 12 Sol and La 0.1 Bi 0.9 FeO 3 The powder is mixed evenly to obtain a slurry, where x is BiY 2 Fe 5 o 12 The mass percentage of , and x=0.1;

[0032] 4) Insulate and heat-treat the above uniformly mixed slurry at 80°C, 200°C and 400°C for 2 hours to ob...

Embodiment 3

[0036] Embodiment 3: 1) by chemical general formula BiY 2 Fe 5 o 12 Analytical pure Bi(NO 3 ) 3 ·5H 2 O, Y (NO 3 ) 3 ·5H 2 O and Fe(NO 3 ) 3 9H 2 O is dissolved in ethylene glycol to make transparent BiY with a concentration of 0.3mol / l 2 Fe 5 o 12 Sol;

[0037] 2) According to the general chemical formula La 0.1 Bi 0.9 FeO 3 Analytical pure La 2 o 3 , Bi 2 o 3 and Fe 2 o 3 After preparation, ball mill for 4 hours, then dry, sieve, briquette, pre-fire at 800°C for 3 hours, then crush the obtained block sample and pass through a 120-mesh sieve to obtain La 0.1 Bi 0.9 FeO 3 Powder;

[0038] 3) According to the general chemical formula x BiY 2 Fe 5 o 12 / (1-x)La 0.1 Bi 0.9 FeO 3 BiY 2 Fe 5 o 12 Sol and La 0.1 Bi 0.9 FeO 3 The powder is mixed evenly to obtain a slurry, where x is BiY 2 Fe 5 o 12 The mass percentage of x = 0.2;

[0039] 4) Insulate and heat-treat the above uniformly mixed slurry at 80°C, 200°C and 400°C for 2 hours to obtain...

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Abstract

A preparation method of a bismuth ferrite-based composite material with high ferromagnetic and ferroelectric properties comprises the following steps: dissolving Bi(NO3)3.5H2O, Y(NO3)3.5H2O, and Fe(NO3)3.9H2O in glycol to obtain BiY2Fe5O12 sol; ball-milling La2O3, Bi2O3 and Fe2O3, oven-drying, sieving, briquetting, grinding the block-shaped sample, and sieving to obtain La0.1Bi0.9FeO3 powder; uniformly blending BiY2Fe5O12 sol with La0.1Bi0.9FeO3 powder to obtain a slurry, and processing the slurry by temperature preservation thermal treatment to obtain mixed powder; adding PVA adhesive into the mixed powder to obtain mixed powder of the composite material; compressing the mixed powder, heating to remove the PVA adhesive, and sintering to obtain the bismuth ferrite-based composite material. The magnetization intensity of the bismuth ferrite-based composite material is improved from 0.007emu / g to 4.5emu / g. The bismuth ferrite-based composite material can significantly improve the shape of electric hysteresis loop of bismuth ferrite ceramic, and improve remanent polarization from 0.6 muC / cm<2> to 1.2 muC / cm<2>.

Description

technical field [0001] The invention belongs to the field of material science, in particular to a bismuth ferrite-based composite material and a method for simultaneously improving the ferromagnetic and ferroelectric properties of bismuth ferrite ceramics Background technique [0002] A multiferroic material is a material that integrates ferroelectricity and magnetic order, so that ferroelectricity and magnetism coexist and have magnetoelectric coupling properties. The material complements the deficiencies of pure (anti-) ferroelectric or (anti-) ferromagnetic materials and presents electrical and magnetic order at the same time. Due to the coexistence of ferroelectricity and magnetism, this material can be induced by an electric field to generate a magnetic field. , and a magnetic field can also induce ferroelectric polarization, a property known as the magnetoelectric effect. Electric field can induce magnetic polarization, and magnetic field can induce ferroelectric pola...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 林营杨海波杨艳艳朱建锋王芬
Owner SHAANXI UNIV OF SCI & TECH
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