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A kind of preparation method of barium cobaltate powder

A technology of barium cobaltate and powder, which is applied in chemical instruments and methods, cobalt compounds, inorganic chemistry, etc., to achieve the effects of uniform phase, good stability, and cost reduction

Inactive Publication Date: 2018-08-14
XIAN TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] At present, there is no mature method that can stably prepare BaCoO 2 , it has been reported in the literature that Shugurov and Lopatin et al. 3 o 4 When ionized with barium oxide, gaseous BaCoO is obtained 2 molecule, and its thermodynamic properties were studied by high-temperature mass spectrometry

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  • A kind of preparation method of barium cobaltate powder
  • A kind of preparation method of barium cobaltate powder

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[0025] The embodiment of the present invention provides a method for preparing barium cobaltate powder. The preparation method is: the compound of barium and cobalt is prepared by solid state reaction at a reaction temperature of 1000-1200°C.

[0026] The preparation method is specifically realized through the following steps:

[0027] Step 1: Weigh the compounds of barium and cobalt according to the equimolar ratio of 1:1, mix them, put them in a mortar and grind them evenly;

[0028] Step 2: putting alumina microspheres into the mixture ground in step 1, placing it on a vibrating sieve for fine grinding to obtain a fully mixed fine powder; pressing the fully mixed and ground fine powder into thin sheets;

[0029] Step 3: Put the flake reactant prepared in step 2 in a platinum crucible, place it in a tube furnace, and raise the temperature at a rate of 280-300°C / h in an argon atmosphere, and heat it up to 150-200°C for 15-30 minutes. minutes, then continue to heat up at a ra...

Embodiment 1

[0034] Embodiment 1 of the present invention provides a kind of preparation method of barium cobaltate powder, comprises the following steps successively:

[0035](1) First weigh 3.956g BaCO according to the metering ratio of 1:1 3 (AlfaAesar99.9%) and 1.59g CoO (AlfaAesar99.5%), after mixing, put it in a mortar and grind it evenly.

[0036] (2) Put alumina microspheres into the above-mentioned ground mixture, place it on a vibrating sieve for fine grinding, and obtain a fully mixed fine powder. The above-mentioned fine powder after thorough mixing and grinding is pressed into flakes.

[0037] (3) Put the above-mentioned flake reactant in a platinum crucible, place it in a tube furnace, and raise the temperature at a rate of 300°C / h in an argon atmosphere, heat it up to 180°C and keep it for 15 minutes, and then heat it at a rate of 180°C / h. Continue to heat up to 1000°C and calcinate for 36 hours, and finally cool to room temperature and grind into powder to obtain the samp...

Embodiment 2

[0040] Embodiment 2 of the present invention provides a kind of preparation method of barium cobaltate powder, comprises the following steps successively:

[0041] (1) First weigh 3.947gBaCO according to the metering ratio of 1:1 3 (AlfaAesar99.9%) and 1.55g CoO (AlfaAesar99.5%), after mixing, put it in a mortar and grind it evenly.

[0042] (2) Put alumina microspheres into the above-mentioned ground mixture, place it on a vibrating sieve for fine grinding, and obtain a fully mixed fine powder. The above-mentioned fine powder after thorough mixing and grinding is pressed into flakes.

[0043] (3) Put the above-mentioned flake reactants in a platinum crucible, place them in a tube furnace, and raise the temperature at a rate of 280°C / h in an argon atmosphere, heat it up to 180°C and keep it for 30 minutes, and then heat it at a rate of 200°C / h. While continuing to heat up to 1100°C, calcined for 40 hours, finally cooled to room temperature, and ground into powder to obtain t...

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Abstract

The invention discloses a preparation method of barium cobaltate powder. According to the preparation method, the barium cobaltate powder is prepared from compounds of barium and cobalt by a solid phase reaction method at the reaction temperature of 1000 to 1200 DEG C. The barium cobaltate powder is prepared by adoption of the solid phase method, and solid phase reaction is adopted, so that requirements on equipment are lowered, the cost is reduced, the process is simple, and batch production can be realized. The solid phase reaction process is fully considered, and a secondary grinding method is adopted in the two processes of material reaction on a phase interface and material migration, so that the reactant powder is relatively fine and can be fully mixed, the possibility of introducing impurities is low, and the prepared product is full in reaction, uniform in phase and good in stability.

Description

technical field [0001] The invention belongs to the technical field of chemical compound preparation, and in particular relates to a preparation method of barium cobaltate powder. Background technique [0002] CoO 3-δ In recent years, it has attracted the attention of many scientists at home and abroad, because this compound has novel electronic structure and chemical and physical properties, and has a wide range of application prospects, such as: giant magnetoresistance, phase separation, memory effect, superconductivity etc. [0003] This type of material actually contains a series of compounds: 2H-BaCoO 3-δ (2.85<3-δ<3.0), 7H(2.52<3-δ<2.575), 12H(2.43<3-δ<2.49), 15H(2.10<3-δ<2.23), and cubic BaCoO 2.72 , orthorhombic BaCoO 2.63 and BaCoO 2.07 , and an unindexed BaCoO 2.31 , up to the hexagonal BaCoO 2 . [0004] Ideal hexagonal 2H-structured BaCo without oxygen vacancies 4+ o 3 step by step reduction, the hexagonal h-[BaO 3 ] will be rep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/00
CPCC01G51/66C01P2002/72
Inventor 郑德山雷倩孙同泽李辉
Owner XIAN TECH UNIV