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Method for preparing BiFeO3 nano-particle and fine particle

A nanoparticle and microparticle technology, which is applied in nanostructure manufacturing, chemical instruments and methods, nanotechnology, etc., can solve the problems of expensive equipment, process and complexity, and achieve the effect of high particle purity and wide particle size distribution

Inactive Publication Date: 2008-09-24
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of expensive equipment or complicated process of the prior art, and propose a new method for preparing BiFeO 3 Methods for Nanoparticles and Microparticles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Weigh 0.01 moles of Fe(NO 3 ) 3 .9H 2 O and Bi(NO 3 ) 3 .5H 2 O, respectively, were dissolved in 100 ml of deionized water and mixed. Add 0.01 mol glycine, stir until Fe(NO 3 ) 3 .9H 2 O and Bi(NO 3 ) 3 .5H 2 O is completely dissolved. Add 10 ml of oxalic acid to the mixed solution for dehydration, pour the resulting solution into an evaporating dish, put it in a microwave oven with a power of 600 watts, and heat it for 30 minutes until it evaporates to dryness and burns to obtain loose BiFeO 3 Granular powder sample.

Embodiment 2

[0014] Weigh 0.005 moles of Fe according to stoichiometric ratio 1:1 2 o 3 and Bi 2 o 3 , respectively dissolved in 100 milliliters of 50% (volume ratio) dilute nitric acid to prepare a solution, and then mixed. Add 0.005 mol of glycine to the mixed solution, stir to dissolve. Add 5 ml of oxalic acid to the mixed solution for dehydration, pour the resulting solution into an evaporating dish, put it in a microwave oven with a power of 800 watts, and heat it for 20 minutes until it evaporates to dryness and burns to obtain loose BiFeO 3 Granular powder sample.

Embodiment 3

[0016] Weigh 0.01 moles of Fe(NO 3 ) 3 .9H 2 O and Bi(NO 3 ) 3 .5H 2 O, respectively, were dissolved in 100 ml of deionized water and mixed. Add 0.01 mol of glycine to the mixed solution, stir to dissolve. Add 10 ml of oxalic acid to the mixed solution for dehydration, pour the resulting solution into an evaporating dish, place it in a microwave oven, and heat it for 20 minutes with a power of 800 watts until it evaporates to dryness and burns to obtain BiFeO 3 Granular powder sample. The prepared BiFeO 3 Granular powder samples are compressed into tablets (generally 2mm thick) with an ordinary small tablet machine, and the BiFeO 3 The sample is placed in a crucible, then placed in a microwave oven and sintered with a power of 800 watts for five minutes, and then quickly quenched to room temperature to obtain BiFeO 3 Blocky particulate samples.

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Abstract

The invention relates to a preparation method of BiFeO3 nano-particles and particles, and a mixed nitrate solution is prepared by Fe(NO3)3.9H2O and Bi(NO3)3.5H2O or Fe2O3 and Bi2O3 according to the stoichiometry of 1:1. Glycine is added to be used as fuel, and 5 to 10 millilitres of oxalic acid dehydration is added. The obtained solution is put into a microwave oven to be heated with 800 watt power and continuously heated for 10 to 20 seconds after the water is dried out, and the rapid combustion reaction of a mixture happens, thereby obtaining a loose nano-particle powder product. The obtained particle powder is suppressed into scraps by a preforming machine, and a bulk sample is obtained. Then, a bulk sample is arranged in the microwave oven to nodulize and to rapidly quench to the room temperature, and a massive particle product which is uniform in size is obtained. The BiFeO3 prepared by the method has the advantages of high purity, uniform particle size and adjustable granularity.

Description

technical field [0001] The invention belongs to a method for preparing multiferroic materials, in particular to a method for preparing BiFeO3 particles and microparticles. Background technique [0002] Multiferroic BiFeO 3 It has a higher existence temperature of the magnetoelectric effect, which provides the possibility to design multifunctional devices using multiferroic materials at room temperature, which makes it very popular. However, single-phase BiFeO 3 The preparation is not easy, which for the study of BiFeO 3 The nature and application of it set up obstacles. Through extensive research in recent years, people have developed a variety of preparation methods to obtain single-phase bulk BiFeO 3 Samples, including the preparation of thin films by laser pulse deposition (PLD) method [J.Wang, J.B.Neaton, et al., Science, 299, 1719 (2003)], dilute nitric acid cleaning method [M.M.Kumar, et al., Appl.Phys .Lett.76,2764(2000)], rapid liquid phase sintering method [Y.P...

Claims

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Application Information

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IPC IPC(8): C01G49/00C01G29/00B82B3/00
Inventor 罗万居王栋梁马衍伟
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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