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La0.1Bi0.9FeO3/CoFe2O4 magneto-electricity compound powder body and preparation method thereof

A magnetoelectric composite, cofe2o4 technology, applied in the field of material science, can solve the problems of difficulty in obtaining pure phase, high calcination temperature, poor uniformity, etc., and achieve the effect of overcoming high synthesis temperature, low preparation temperature and good uniformity

Active Publication Date: 2015-06-24
江苏信众企业管理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently BiFeO 3 There are three outstanding problems: (1) Since Bi is easy to volatilize, both kinetic and thermodynamic balance must be considered during synthesis, so it is difficult to obtain pure phase BiFeO 3
This method not only requires a high calcination temperature due to the complex process, but also the prepared composite powder is mixed on the grain size, resulting in poor uniformity, which ultimately directly affects the performance of the composite powder.

Method used

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  • La0.1Bi0.9FeO3/CoFe2O4 magneto-electricity compound powder body and preparation method thereof
  • La0.1Bi0.9FeO3/CoFe2O4 magneto-electricity compound powder body and preparation method thereof
  • La0.1Bi0.9FeO3/CoFe2O4 magneto-electricity compound powder body and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) According to the general chemical formula xLa 0.1 Bi 0.9 FeO 3 / (1-x)CoFe 2 o 4 , will analyze pure Fe(NO 3 ) 3 9H 2 O, Bi(NO 3 ) 3 9H 2 O, La(NO 3 ) 3 ·6H 2 O and Co(NO 3 ) 2 ·6H 2 O was added to distilled water to prepare a solution; where, x was La 0.1 Bi 0.9 FeO 3 The mass percentage of , and x=0.9;

[0036] 2) Add citric acid to the solution in step 1), and stir for 1 h under heating in a water bath at 80°C to obtain sol A, wherein the molar amount of citric acid added is the four metals in the solution: iron ion, bismuth ion, lanthanum ion, and cobalt ion 2 times the total molar mass of ions;

[0037] 3) Under stirring, use ethylenediamine to adjust the pH value of sol A to 6.5 to obtain uniform sol B;

[0038] 4) Put sol B into a vacuum drying oven and dry at 200°C for 2 hours to obtain a dark brown loose xerogel;

[0039] 5) Grind the dry gel and put it into a crucible, and place the crucible in an electric furnace for calcination at 700°...

Embodiment 2

[0045] 1) According to the general chemical formula xLa 0.1 Bi 0.9 FeO 3 / (1-x)CoFe 2 o 4 , will analyze pure Fe(NO 3 ) 3 9H 2 O, Bi(NO 3 ) 3 9H 2 O, La(NO 3 ) 3 ·6H 2 O and Co(NO 3 ) 2 ·6H 2 O was added to distilled water to prepare a solution; where, x was La 0.1 Bi 0.9 FeO 3 The mass percentage of , and x=0.8;

[0046] 2) Add citric acid to the solution in step 1), and stir for 1 hour under heating in a water bath at 100°C to obtain sol A, wherein the molar amount of citric acid added is four metals in the solution: iron ions, bismuth ions, lanthanum ions, and cobalt ions 3 times the total molar mass of ions;

[0047] 3) Under stirring, use ethylenediamine to adjust the pH value of Sol A to 7.5 to obtain uniform Sol B;

[0048] 4) Put Sol B into a vacuum drying oven and dry at 190°C for 3 hours to obtain a dark brown loose xerogel;

[0049] 5) Put the dry gel into a crucible after grinding, and place the crucible in an electric furnace for calcination a...

Embodiment 3

[0055] 1) According to the general chemical formula xLa 0.1 Bi 0.9 FeO 3 / (1-x)CoFe 2 o 4 , will analyze pure Fe(NO 3 ) 3 9H 2 O, Bi(NO 3 ) 3 9H 2 O, La(NO 3 ) 3 ·6H 2 O and Co(NO 3 ) 2 ·6H 2 O was added to distilled water to prepare a solution; where, x was La 0.1 Bi 0.9 FeO 3 The mass percentage of , and x=0.7;

[0056] 2) Add citric acid to the solution in step 1), and stir for 2 hours under heating in a water bath at 90°C to obtain sol A, wherein the molar amount of citric acid added is the four metals in the solution: iron ion, bismuth ion, lanthanum ion, and cobalt ion 4 times the total molar mass of ions;

[0057] 3) Under stirring, use ethylenediamine to adjust the pH value of sol A to 7 to obtain uniform sol B;

[0058] 4) Put sol B into a vacuum drying oven and dry at 180°C for 4 hours to obtain a dark brown loose xerogel;

[0059] 5) Put the dry gel into a crucible after grinding, and place the crucible in an electric furnace for calcination at ...

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Abstract

The invention relates to a La0.1Bi0.9FeO3 / CoFe2O4 magneto-electricity compound powder body and a preparation method thereof. The preparation method comprises the steps: according to a chemical general formula xLa0.1Bi0.9FeO3 / (1-x)CoFe2O4, adding analytical-grade Fe(NO3)3.9H2O, Bi(NO3)3.9H2O, La (NO3)3.6H2O and Co(NO3)2.6H2O in distilled water to prepare a solution, wherein x is a mass percent of the La0.1Bi0.9FeO3, and is not less than 0.6 and not more than 0.9; adding citric acid in the solution, uniformly stirring, adjusting the pH value to obtain a uniform sol B; and drying the sol B and calcining. The invention is a method for rapidly preparing the La0.1Bi0.9FeO3 / CoFe2O4 magneto-electricity compound powder body at a lower temperature; and the method is simple in process and energy-saving; and the prepared magneto-electricity compound powder body is better in uniformity.

Description

technical field [0001] The invention belongs to the field of material science, in particular to a La 0.1 Bi 0.9 FeO 3 / CoFe 2 o 4 Magnetoelectric composite powder and its preparation method. Background technique [0002] Multiferroic materials are a large class of very important advanced functional materials. Components made of multiferroic materials have the functions of converting, transmitting, processing information, storing energy, saving energy, etc., and are widely used in energy, telecommunications, automatic Control, communication, household appliances, biology, medical and health, light industry, mineral processing, physical prospecting, military industry and other fields. With the rapid development of mobile communication and computer technology, all kinds of electronic equipment are required to become more highly integrated, multi-functional, miniaturized and fast-responsive, thus putting forward higher standards for materials, requiring components not only ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/626
Inventor 杨海波康盼林营朱建锋王芬
Owner 江苏信众企业管理有限公司