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Titanium-iron-gadolinium cobaltate-bismuth ceramic material in layer structure and preparation method of titanium-iron-gadolinium cobaltate-bismuth ceramic material

A technology of gadolinium bismuth cobaltate and layered structure is applied in the field of layered structure gadolinium bismuth cobaltate gadolinium bismuth ceramic material and its preparation, which can solve the problems of not meeting practical application and the like, so as to improve ferroelectricity and ferromagnetism. , the effect of reducing leakage current

Inactive Publication Date: 2013-01-09
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the three-layer ferroelectric material Bi 4 Ti 3 o 12 with three BiFeO 3 The combination still exhibits localized antiferromagnetism, which cannot meet the needs of practical applications, so other methods must be used to improve ferroelectricity and ferromagnetism.

Method used

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  • Titanium-iron-gadolinium cobaltate-bismuth ceramic material in layer structure and preparation method of titanium-iron-gadolinium cobaltate-bismuth ceramic material
  • Titanium-iron-gadolinium cobaltate-bismuth ceramic material in layer structure and preparation method of titanium-iron-gadolinium cobaltate-bismuth ceramic material
  • Titanium-iron-gadolinium cobaltate-bismuth ceramic material in layer structure and preparation method of titanium-iron-gadolinium cobaltate-bismuth ceramic material

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preparation example Construction

[0035] The present invention also provides a preparation method of gadolinium-bismuth titanium iron cobaltate ceramic material with a layered structure, the specific steps are as follows:

[0036] Step 1: dissolving n-butyl titanate, bismuth-containing compound, gadolinium-containing compound, iron-containing compound, cobalt-containing compound and complexing agent in an acid solution to obtain a mixed solution. The molar ratio of titanium, bismuth, gadolinium, iron and cobalt in the n-butyl titanate, bismuth-containing compound, gadolinium-containing compound, iron-containing compound and cobalt-containing compound is 3:7-x:x:1.5:1.5,0 <x<3;

[0037] Step 2: Evaporating the mixed solution to dryness and pre-calcining to obtain a precursor;

[0038] Step 3: Forming and sintering the precursor into tablets to obtain a gadolinium-bismuth titanocobaltate ceramic material with a layered structure.

[0039] The present invention uses n-butyl titanate, bismuth-containing compound...

Embodiment 1

[0050] The purity is 98% n-butyl titanate (C 16 h 36 o 4 Ti) 7.1475g, with a purity of 99% bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O) 22.5211g, 5.075mL of gadolinium nitrate aqueous solution with a concentration of 0.7038mol / L, and a purity of 98.5% iron nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O) 4.3286g, with a purity of 99.5% cobalt nitrate hexahydrate (Co(NO 3 ) 3 ·6H 2 O) 3.1182g was dissolved in nitric acid solution, 18.6157g of ethylenediaminetetraacetic acid (EDTA) with a purity of 98% and 19.1227g of citric acid with a purity of 98% were added as complexing agents, and a mixed solution was obtained after stirring. Put the mixed solution in a crucible and evaporate to dryness until it is burned to obtain a powder, and pre-burn the obtained powder in a muffle furnace at 750°C for 3 hours to remove organic matter to obtain a precursor; A cylindrical sample with a size of Φ12mm×2mm was made, and it was sintered in a muffle furnace at 880°C for 5 hours to ob...

Embodiment 2

[0056] The purity is 98% n-butyl titanate (C 16 h 36 o 4 Ti) 7.1475g, with a purity of 99% bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H2 O) 21.6549g, 7.6125mL of gadolinium nitrate aqueous solution with a concentration of 0.7038mol / L, and a purity of 98.5% iron nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O) 4.3286g, with a purity of 99.5% cobalt nitrate hexahydrate (Co(NO 3 ) 3 ·6H 2 O) 3.1182g was dissolved in nitric acid solution, 18.6157g of ethylenediaminetetraacetic acid (EDTA) with a purity of 98% and 19.1227g of citric acid with a purity of 98% were added as complexing agents, and a mixed solution was obtained after stirring. Put the mixed solution in a crucible and evaporate to dryness until it is burned to obtain a powder, and pre-burn the obtained powder in a muffle furnace at 750°C for 3 hours to remove organic matter to obtain a precursor; A cylindrical sample with a size of Φ12mm×2mm was made, and it was sintered in a muffle furnace at 880°C for 5 hours to obt...

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Abstract

The invention provides a titanium-iron-gadolinium cobaltate-bismuth ceramic material in a layer structure. Gadolinium ions substitute for part of bismuth ions, and cobalt ions substitute for part of iron ions so that Bi7-xGdxFe1.5Co1.5Ti3O21 layered Aurivillius type multiferroic oxide ceramics are obtained. The titanium-iron-gadolinium cobaltate-bismuth ceramic material has the advantages that on one hand, an iron atomic structure and a cobalt atomic structure are approximate, and after part of the cobalt ions substitutes for part of iron ions in position, Fe-O octahedrons and Co-O octahedrons are arrayed in order, and Fe-O-Co coupling can be generated partially, so that ferroelectricity and ferromagnetism of the ceramic material can be improved; and on the other hand, since the gadolinium ions partially having magnetism substitute for part of bismuth ions, leakage current is effectively reduced while ferroelectricity of the ceramic material is enhanced, and partially existing coupling of Gd-O-Co / Fe enables the ferromagnetism of the ceramic material to be improved.

Description

technical field [0001] The invention relates to the technical field of oxide ceramic materials, in particular to a layered structure gadolinium-bismuth titanocobaltate ceramic material and a preparation method thereof. Background technique [0002] The basic properties of iron include ferroelectricity / antiferroelectricity, ferromagnetism / antiferromagnetism / ferrimagnetism and ferroelasticity. Multiferroic materials refer to materials that contain two or more basic properties of iron in the same phase. In multiferroic materials, different iron properties can produce some new properties, such as magnetoelectric effect, magnetic dielectric effect, etc. It is because of these effects that multiferroic materials have potential application prospects and can be widely used in switching Devices, sensors, capacitors and storage devices, etc. [0003] The magnetoelectric effect is an important application of multiferroic materials. The magnetoelectric effect refers to the coupling e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/622
Inventor 陆亚林孙书杰凌意翰彭冉冉叶枫叶陈小兵
Owner UNIV OF SCI & TECH OF CHINA
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