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Nine-layer-structure titanium iron bismuth cobalt oxide multiferroic ceramic material and preparation method thereof

A technology of bismuth iron cobaltate and ceramics, which is applied in the field of nine-layer layered bismuth titanium iron cobaltate ceramic materials and its preparation, can solve the problems of unevenness, long experiment period, high reaction temperature, etc., and achieve improved ferromagnetic properties, Improved electrical performance and low burn-in temperature

Inactive Publication Date: 2014-12-17
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The U.S. Journal of Applied Physics (Applied Physics Letters, 2012, Vol. 101, No. 1, Page 012402) introduced an in-depth study on this material with a five-layer structure. The sample was obtained by a solid-state reaction method, but due to Ball milling is required, resulting in high reaction temperature (usually around 1000°C), long experiment period (usually more than 40 hours), and large, uneven, and easy to agglomerate particles
At present, there are no public reports on the performance of samples with layered structures of seven or more layers.

Method used

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  • Nine-layer-structure titanium iron bismuth cobalt oxide multiferroic ceramic material and preparation method thereof
  • Nine-layer-structure titanium iron bismuth cobalt oxide multiferroic ceramic material and preparation method thereof
  • Nine-layer-structure titanium iron bismuth cobalt oxide multiferroic ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] According to the purity of each raw material listed in Table 1 and its weighing amount, get chemically pure n-butyl titanate (C 16 h 36 o 4 Ti), analytically pure bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O), analytically pure ferric nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O) and analytically pure cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 (0) is a raw material, after being accurately weighed in a molar ratio of 3:10:5:1, it is dissolved in 100ml mass percent concentration and is 80% nitric acid aqueous solution, and a complexing agent composed of ethylenediaminetetraacetic acid and citric acid is added. The amount to be added is such that the molar ratio of ethylenediaminetetraacetic acid and citric acid in the complexing agent to the metal ions contained in the solution is 0.7:1:1, and stirred at a constant speed until a clear solution is formed.

[0017] The purity and usage amount of concrete various raw materials are shown in the following table 1 ...

Embodiment 2

[0028] According to the requirements of each raw material purity listed in Table 2 and its weighing quality, get chemically pure n-butyl titanate (C 16 h 36 o 4 Ti), analytically pure bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O), analytically pure ferric nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O) and analytically pure cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 (0) is a raw material, after being accurately weighed in a molar ratio of 3:10:5.5:0.5, it is dissolved in 100ml mass percent concentration and is 70% nitric acid aqueous solution, and a complexing agent composed of ethylenediaminetetraacetic acid and citric acid is added, and Add the amount so that the molar ratio of ethylenediaminetetraacetic acid, citric acid in the complexing agent and the metal ions contained in the solution is 0.5:1:1, and stir at a constant speed until a clear solution is formed.

[0029] The purity and consumption of concrete various raw materials are shown in the following table...

Embodiment 3

[0040] According to the requirements of each raw material purity listed in Table 3 and its weighing quality, get chemically pure n-butyl titanate (C 16 h 36 o 4 Ti), analytically pure bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O) and analytically pure ferric nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O) as a raw material, after being accurately weighed in a molar ratio of 3:10:6, it is dissolved in 100ml of a mass percentage concentration of 90% nitric acid aqueous solution, and a complexing agent composed of ethylenediaminetetraacetic acid and citric acid is added, the amount of Make the molar ratio of ethylenediaminetetraacetic acid in the complexing agent, citric acid and the metal ions contained in the solution to be 1:1:1, and stir at a constant speed until a clear solution is formed.

[0041] The purity and consumption of concrete various raw materials are shown in the following table 3 in the present embodiment:

[0042] Prepare Bi in the embodiment 3 of table 3...

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Abstract

The invention discloses a nine-layer-structure titanium iron bismuth cobalt oxide ceramic material with multiferroic performance and a preparation method thereof. The preparation method is characterized in that dissolving titanate, bismuth nitrate, ferric nitrate and cobalt nitrate in an aqueous nitric acid solution according to a mol ratio of 3: 10: (6-x): x and adding a complexing agent composed of ethylene diamine tetraacetic acid and citric acid, wherein a mol ratio of ethylene diamine tetraacetic acid to citric acid to metal ions in the solution is 0.5-1: 1: 1; and pre-burning powder obtained after full evaporation of the solution at a temperature of 700 to 800 DEG C to remove an organic matter and carrying out sintering at a temperature of 800 to 1100 DEG C for 5 to 10 h after tablet compressing and molding so as to obtain a nine-layer-structure Aurivillius-type multiferroic ceramic with a chemical formula of Bi10Fe6-xCoxTi3O30. The structure of the ceramic is that three titanium-oxygen (Ti-O) octahedrons and six iron-oxygen (Fe-O) octahedrons are sandwiched between two bismuth-oxygen layers ((Bi2O2)<2+>) and a part of Fe is substituted by Co; and the ceramic has ferroelectricity and ferromagnetism at the same time at a temperature higher than room temperature.

Description

technical field [0001] The invention belongs to the field of multiferroic oxide ceramic materials, and in particular relates to a nine-layer layered bismuth titanocobaltate ceramic material with multiferroic properties and a preparation method thereof. Background technique [0002] Multiferroic materials refer to materials that exhibit ferroelectric order and ferromagnetic / antiferromagnetic order at the same time in a certain temperature range, and there is a certain coupling between them. This kind of material is attracting more and more attention because they can be widely used in the research and development of ferroelectric and magnetic devices, and more importantly, because some materials can provide the coupling between magnetoelectricity inside, so as to facilitate the design and application of devices. It provides an additional degree of freedom, so it shows very attractive application prospects in emerging spintronics, multi-state information storage, electrically d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 陆亚林黄妍彭冉冉刘敏初宝进
Owner UNIV OF SCI & TECH OF CHINA
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