Layered perovskite multiferroic material and preparation method thereof

A technology of perovskite structure and multiferroic materials, applied in the field of ceramic materials, can solve the problems of ferroelectric properties, second phase and crystal defects, inferior ferroelectricity of multiferroic materials, etc., so as to improve ferroelectric properties and suppress leakage. phenomenon, the effect of improving ferromagnetic properties

Inactive Publication Date: 2013-07-31
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

[0004] Existing technology combines BiFeO 3 On the basis of the advantages and disadvantages of the bismuth layered perovskite structure, a single-step synthesis method is used to prepare the oxides of ferroelectric metals and ferromagnetic metals or their nitrates and carbonates as raw materials. Ferroelectric and ferromagnetic bismuth layered perovskite structure multiferroic ceramic materials, but this method is easy to cause the generation of the second phase and crystal defects, the synthesized layered perovskite multiferroic materials, due to the magnetic ion The multivalent state of the multivalent state and the oxygen vacancies caused by the volatilization of Bi elements will cause the leakage current phenomenon of the material, making the ferroelectric properties of the prepared multiferroic materials far inferior to those of the parent ferroelectric materials.
For example, the barium strontium titanate single crystal prepared by H.Irie and M.Miyayama.Applied Physics Letters, 79(2):251-253(2001) can only obtain 29μC / cm 2 Bismuth titanate single crystal prepared by literature S.E.Cummins, and L.E.Cross.Journal of Applied Physics, 39(5):2268-2274(1968) can only obtain 50μC / cm 2 saturation polarization

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  • Layered perovskite multiferroic material and preparation method thereof
  • Layered perovskite multiferroic material and preparation method thereof
  • Layered perovskite multiferroic material and preparation method thereof

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[0034] The invention provides a method for preparing a multiferroic material with a layered perovskite structure, comprising:

[0035] The bismuth layered perovskite structure ferroelectric material and the magnetic material containing transition metal elements are mixed by ball milling in deionized water or ethanol, dried, and pre-fired to obtain a layered perovskite structure multiferroic material;

[0036]The bismuth layered perovskite structure ferroelectric material has the molecular formula shown in formula (I):

[0037] (Bi 2 o 2 ) 2+ (A n-1 B n o 3n+1 ) 2- , formula (I);

[0038] Wherein A is selected from any one or more of Na, K, Ca, Sr, Ba, Pb, Bi, La, Y, Gd, Pr, and B is selected from any one or more of Ti, Nb, W, Ta. Several, n is a positive integer.

[0039] The present invention prepares a multiferroic material by inserting a magnetic transition metal element into a bismuth layered perovskite structure ferroelectric material with ferroelectric propertie...

Embodiment 1

[0067] Dissolve 0.4mol of n-butyl titanate, 0.42mol of bismuth nitrate pentahydrate, 0.1mol of strontium nitrate and 20mL of concentrated nitric acid in 200mL of deionized water, then add 0.63mol of ethylenediaminetetraacetic acid and 0.9mol of citric acid, and stir the system evenly Then add ammonia water to adjust its pH value to 7 to obtain a clear solution; place the prepared clear solution in a ceramic evaporating dish for heating and concentration until the solution is evaporated to dryness to obtain a powder; pre-fire the obtained powder in a muffle furnace at 750°C 2h, and then grind to obtain strontium bismuth titanate powder.

[0068] Dissolve 0.21 mol of bismuth nitrate pentahydrate, 0.1 mol of ferric nitrate nonahydrate, 0.1 mol of cobalt nitrate hexahydrate and 10 mL of concentrated nitric acid in 100 mL of deionized water, then add 0.28 mol of ethylenediaminetetraacetic acid and 0.4 mol of citric acid, and stir the system After uniformity, add ammonia water to ad...

Embodiment 2

[0077] Dissolve 0.4mol of n-butyl titanate, 0.42mol of bismuth nitrate pentahydrate, 0.1mol of strontium nitrate and 20mL of concentrated nitric acid in 200mL of deionized water, then add 0.63mol of ethylenediaminetetraacetic acid and 0.9mol of citric acid, and stir the system evenly Then add ammonia water to adjust its pH value to 7 to obtain a clear solution; place the prepared clear solution in a ceramic evaporating dish for heating and concentration until the solution is evaporated to dryness to obtain a powder; pre-fire the obtained powder in a muffle furnace at 750°C 2h, and then grind to obtain strontium bismuth titanate powder.

[0078] Mix 0.1 mol of the prepared strontium bismuth titanate powder with 0.105 mol of bismuth oxide, 0.05 mol of iron oxide and 0.05 mol of cobalt trioxide in deionized water for 30 hours to obtain a wet material; then place the obtained wet material at 80°C After drying, put it in a corundum crucible, and pre-fire it in a muffle furnace at 8...

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Abstract

The invention provides a layered perovskite multiferroic material which is prepared by performing a ball milling for a bismuth layered perovskite ferroelectric material and a magnetic material containing transition metal elements, and then mixing, drying and sintering, wherein the bismuth layered perovskite ferroelectric material has a molecular formula (Bi2O2)<2+>(An-1BnO3n+1)<2-> as shown in a formula I, A is selected from any one or several of Na, K, Ca, Sr, Ba, Pb, Bi, La, Y, Gd and Pr, B is selected from any one or several of Ti, Nb, W and Ta, and n is positive integers. According to the invention, the bismuth layered perovskite ferroelectric material is inserted with magnetic transition metal elements, so as to prepare the multiferroic material, thereby effectively inhibiting electric leakage phenomena common in the magnetic materials and at the same time improving ferroelectric properties; and by together inserting different magnetic ions into interlayer of ferroelectric, different magnetic ions can be fully coupled, thereby improving ferromagnetic properties of the materials.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a layered perovskite structure multiferroic material and a preparation method thereof. Background technique [0002] The concept of multiferroic materials was proposed by Schmid in Switzerland in 1994, which means that the same phase of materials contains two or more basic properties of iron, such as ferroelectricity, ferromagnetism and ferroelasticity. This kind of material has both spontaneous ferroelectric order and ferromagnetic order at a certain temperature. It is their simultaneous existence that causes the magnetoelectric coupling effect, makes multiferroic materials have some special physical properties, and triggers several new, Significant physical phenomena, such as: generating electrical polarization or inducing ferroelectric phase transition under the action of a magnetic field; generating magnetic polarization or inducing ferromagnetic phase transition un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/453C04B35/622
Inventor 陆亚林王建林向斌周瑜伏启唐健刘敏彭冉冉傅正平
Owner UNIV OF SCI & TECH OF CHINA
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