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Preparation method of bismuth ferrate barium titanate solid solution composite material with high magnetization intensity and high polarization intensity

A technology of bismuth ferrite barium titanate and magnetization, applied in the field of material science, can solve the problems of deteriorating ferroelectricity, low resistivity, weak magnetic properties of bismuth ferrite barium titanate solid solution, etc.

Inactive Publication Date: 2013-07-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the magnetic properties of the formed bismuth ferrite barium titanate solid solution are still weak
The introduction of strong magnetic ferrite 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 the above bismuth ferrite barium titanate solid solution to form a composite material, although it can improve the bismuth ferrite barium titanate solid solution magnetic properties, but lowers its resistivity further reducing polarization and worsening ferroelectricity

Method used

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  • Preparation method of bismuth ferrate barium titanate solid solution composite material with high magnetization intensity and high polarization intensity
  • Preparation method of bismuth ferrate barium titanate solid solution composite material with high magnetization intensity and high polarization intensity
  • Preparation method of bismuth ferrate barium titanate solid solution composite material with high magnetization intensity and high polarization intensity

Examples

Experimental program
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Effect test

Embodiment 1

[0022] 1) According to the general chemical formula BiY of bismuth-doped yttrium ferrite 2 Fe 5 o 12 , Weigh analytically pure Bi 2 o 3 , Y 2 o 3 , and Fe 2 o 3 After preparation, ball mill for 4 hours, then dry, sieve, briquette, pre-fire at 900°C for 3 hours, and then crush the resulting block sample through a 120-mesh sieve to obtain BiY 2 Fe 5 o 12 Powder;

[0023] 2) According to the general chemical formula of bismuth ferrite barium titanate solid solution 0.7BiFeO 3 -0.3BaTiO 3 , weighed analytically pure BaCO 3 ,TiO 2 , Bi 2 o 3 and Fe 2 o 3 Ball mill for 4 hours after preparation, then dry, sieve, briquette, pre-fire at 840°C for 3 hours, then crush the resulting block sample and pass through a 120-mesh sieve to obtain 0.7BiFeO 3 -0.3BaTiO 3 Powder;

[0024] 3) According to the general chemical formula xBiY 2 Fe 5 o 12 / (1-x)(0.7BiFeO 3 -0.3BaTiO 3 ) will be 0.7BiFeO 3 -0.3BaTiO 3 Powder and BiY 2 Fe 5 o 12 The powder is mixed evenly, whe...

Embodiment 2

[0030] 1) According to the general chemical formula BiY of bismuth-doped yttrium ferrite 2 Fe 5 o 12 , Weigh analytically pure Bi 2 o 3 , Y 2 o 3 , and Fe 2 o 3 After preparation, ball mill for 4 hours, then dry, sieve, briquette, pre-fire at 900°C for 3 hours, and then crush the resulting block sample through a 120-mesh sieve to obtain BiY 2 Fe 5 o 12 Powder;

[0031] 2) According to the general chemical formula of bismuth ferrite barium titanate solid solution 0.7BiFeO 3 -0.3BaTiO 3 , weighed analytically pure BaCO 3 ,TiO 2 , Bi 2 o 3 and Fe 2 o 3 Ball mill for 4 hours after preparation, then dry, sieve, briquette, pre-fire at 840°C for 3 hours, then crush the resulting block sample and pass through a 120-mesh sieve to obtain 0.7BiFeO 3 -0.3BaTiO 3 Powder;

[0032] 3) According to the general chemical formula xBiY 2 Fe 5 o 12 / (1-x)(0.7BiFeO 3 -0.3BaTiO 3 ) will be 0.7BiFeO 3 -0.3BaTiO 3 Powder and BiY 2 Fe 5 o 12 The powder is mixed evenly, whe...

Embodiment 3

[0038] 1) According to the general chemical formula BiY of bismuth-doped yttrium ferrite 2 Fe 5 o 12 , Weigh analytically pure Bi 2 o 3 , Y 2 o 3 , and Fe 2 o 3 After preparation, ball mill for 4 hours, then dry, sieve, briquette, pre-fire at 900°C for 3 hours, and then crush the resulting block sample through a 120-mesh sieve to obtain BiY 2 Fe 5 o 12 Powder;

[0039] 2) According to the general chemical formula of bismuth ferrite barium titanate solid solution 0.7BiFeO 3 -0.3BaTiO 3 , weighed analytically pure BaCO 3 ,TiO 2 , Bi 2 o 3 and Fe 2 o 3 Ball mill for 4 hours after preparation, then dry, sieve, briquette, pre-fire at 840°C for 3 hours, then crush the resulting block sample and pass through a 120-mesh sieve to obtain 0.7BiFeO 3 -0.3BaTiO 3 Powder;

[0040] 3) According to the general chemical formula xBiY 2 Fe 5 o 12 / (1-x)(0.7BiFeO 3 -0.3BaTiO 3 ) will be 0.7BiFeO 3 -0.3BaTiO 3 Powder and BiY 2 Fe 5 o 12 The powder is mixed evenly, whe...

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Abstract

The invention provides a preparation method of a bismuth ferrate barium titanate solid solution composite material with high magnetization intensity and high polarization intensity. BiY2Fe5O12 powder and 0.7BiFeO3-0.3BaTiO3 powder are prepared; the 0.7BiFeO3-0.3BaTiO3 powder is evenly mixed with the BiY2Fe5O12 powder, and then a polyvinyl alcohol (PVA) adhesive is added to an obtained mixture to obtain mixed powder of the needed composite material; and the mixed powder of the composite material is pressed to be formed according to requirements, heated to remove the adhesive PVA, and then sintered to ceramic to obtain the bismuth ferrate barium titanate solid solution composite material with high magnetization intensity and high resistivity. By adopting the preparation method, the saturation magnetization intensity of bismuth ferrate barium titanate solid solution ceramic can be increased from 0.03emu / g to 4.4emu / g; and meanwhile, the remnant polarization intensity of the bismuth ferrate barium titanate solid solution ceramic can be obviously increased from 18.6 C / cm2 to 20.1 C / cm2.

Description

technical field [0001] The invention belongs to the field of material science, in particular to a method for preparing a bismuth ferrite barium titanate solid solution composite material with high magnetization and polarization. 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 polarization. This special func...

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