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Bismuth ferrite-lead tungstate multiferroic ceramic and preparation method thereof

A technology of multiferroic ceramics and tungsten ferric acid is applied in the field of electronic ceramics, which can solve the problems of uneven antiferromagnetic spin order and weak magnetism, and achieve the effect of suppressing impurity, improving ferromagnetism and reducing impurity.

Active Publication Date: 2011-09-07
XINING KEJIN INDUSTRIAL DESIGN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] BiFeO 3 It is one of the few ferroelectric materials with both ferroelectricity and magnetism at room temperature, BiFeO 3 The magnetic structure of the ions is a spatially modulated inhomogeneous antiferromagnetic spin order, the spins are arranged in an incommensurate sinusoidal manner, and the period is about 62nm, which causes the magnetic moments of each ion to cancel each other out, and shows weak magnetism macroscopically. greatly limit its application

Method used

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  • Bismuth ferrite-lead tungstate multiferroic ceramic and preparation method thereof
  • Bismuth ferrite-lead tungstate multiferroic ceramic and preparation method thereof
  • Bismuth ferrite-lead tungstate multiferroic ceramic and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0019] Using analytically pure grade ferric oxide, bismuth trioxide, lead oxide, tungsten trioxide, the stoichiometric ratio is 0.96BiFeO 3 -0.04Pb(W 1 / 3 Fe 2 / 3 )O 3 Weigh the ingredients; put the prepared materials into the ball mill for mixing, and mix them evenly to obtain ball abrasives; use the airflow spray granulator to granulate the ball abrasives to obtain powder particles with a particle diameter of 0.001 to 1 mm ;Put the obtained powder particles into a press to press into a ceramic body; put the formed body into a furnace for debinding, after the debinding is completed, cool with the furnace to obtain a plain piece; put the plain piece into a pre-lift Put it in a sintering furnace at 750°C, keep it warm for 0.1 hour, and then take it out to obtain 0.96BiFeO 3 -0.04Pb(W 1 / 3 Fe 2 / 3 )O 3 ceramics. figure 1 gives 0.96BiFeO 3 -0.04Pb(W 1 / 3 Fe 2 / 3 )O 3 Dielectric thermograms of ceramics.

Embodiment 2

[0021] Use analytically pure grade ferric oxide, bismuth trioxide, lead oxide, tungsten trioxide, the stoichiometric ratio is 0.90BiFeO 3 -0.10Pb(W 1 / 3 Fe 2 / 3 )O 3 Weigh ingredients. Put the prepared materials into the ball mill for mixing, and mix them evenly to obtain ball abrasives; use the airflow spray granulator to granulate the ball abrasives to obtain powder particles with a particle diameter of 0.001 to 1 mm; the obtained powder The body particles are put into a press to be pressed into a ceramic green body; the formed green body is put into a furnace for debinding, and after the debinding is completed, it is cooled with the furnace to obtain a plain piece; the plain piece is put into a preheated sintering furnace at 880°C , keep it warm for 0.5 hours, and then take it out to obtain 0.90BiFeO 3 -0.10Pb(W 1 / 3 Fe 2 / 3 )O 3 ceramics. figure 2 gives 0.90BiFeO 3 -0.10Pb(W 1 / 3 Fe 2 / 3 )O 3 Dielectric thermograms of ceramics.

Embodiment 3

[0023] Using analytically pure grade ferric oxide, bismuth trioxide, lead oxide, tungsten trioxide, the stoichiometric ratio is 0.65BiFeO 3 -0.35Pb(W 1 / 3 Fe 2 / 3 )O 3 Weigh ingredients. Put the prepared materials into the ball mill for mixing, and mix them evenly to obtain ball abrasives; use the airflow spray granulator to granulate the ball abrasives to obtain powder particles with a particle diameter of 0.001 to 1 mm; the obtained powder The body particles are put into a press and pressed into a ceramic green body; the formed green body is put into the furnace for debinding, and after the debinding is completed, it is cooled with the furnace to obtain a plain sheet; , keep it warm for 0.9 hours, and then take it out to obtain 0.65BiFeO 3 -0.35Pb(W 1 / 3 Fe 2 / 3 )O 3 ceramics. image 3 gives 0.65BiFeO 3 -0.35Pb(W 1 / 3 Fe 2 / 3 )O 3 Dielectric thermograms of ceramics.

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Abstract

The invention discloses bismuth ferrite-lead tungstate multiferroic ceramic and a preparation method thereof. The general formula of the chemical composition of the bismuth ferrite-lead tungstate multiferroic ceramic is (1-x)BiFeO3-xPb(W1 / 3Fe2 / 3)O3, wherein 0<x<0.4 and x represents molar fraction. The preparation method comprises the following steps: taking ferric oxide, bismuth trioxide, lead oxide and tungsten trioxide at a stoichiometric ratio of (1-x)BiFeO3-xPb(W1 / 3Fe2 / 3)O3 (0<x<0.4); performing ball milling, granulating, moulding, discharging rubber, and performing high temperature sintering and other working procedures to finally prepare the bismuth ferrite-lead tungstate multiferroic ceramic with good ferroelectric-ferromagnetic property. By adopting the method disclosed by the invention, the problems that the bismuth ferrite ceramic has weak magnetism and the technology is unstable can be solved, and the multiferroic material with good ferroelectric and ferromagnetic properties can be obtained.

Description

technical field [0001] The invention relates to a bismuth ferrite-lead tungsten ferrite multiferroic ceramic and a preparation method thereof, belonging to the field of electronic ceramics. Background technique [0002] Multiferroicity refers to the properties of two or more of ferroelectricity, ferromagnetism, or ferroelasticity, and now also includes antiferroelectricity, antiferromagnetism, and helical ferromagnetism. people's great interest. Ferroelectric materials have both ferroelectricity and magnetism, and can be magnetized by electric fields, and magnetic fields can also induce electric polarization. This property is called the magnetoelectric effect. This mutual control of magnetism and electricity has extremely important application prospects in information storage, spintronic devices, magnetic sensors, and capacitive-inductive integrated devices. [0003] BiFeO 3 It is one of the few ferroelectric materials with both ferroelectricity and magnetism at room temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 黄延民刘来君苏聪学李芸华方亮胡长征
Owner XINING KEJIN INDUSTRIAL DESIGN CO LTD
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