ABO3 type perovskite composite oxides having high mixed conductivity

A composite oxide and conductivity technology, applied in the field of materials, can solve the problems of high preparation cost and complicated separation process of a single rare earth composite oxide, and achieve the effect of reducing preparation cost and high conductivity

Inactive Publication Date: 2009-04-15

INNER MONGOLIA UNIV OF SCI & TECH

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Due to the similarity and continuity of rare earth elements in structure and physical and chemical properties, the separation...

Abstract

The invention relates to an ABO3 type perovskite composite oxide system with high mixed conductivity, in particular to double rare earth doping of A bit based on Sm0.5Sr0.5CoO3-delta (SSC), which belongs to the field of materials. The chemical equation is Sm0.5-xGdxCoO3-delta (0<x<0.5). The perovskite composite oxide has higher mixed conductivity in the scope of 500 to 800 DEG C; at 500 DEG C, the chemical equation is Sm0.3Gd0.2Sr0.5CoO3-delta, and the conductivity can reach 1820.8S.cm<-1>, which is basically the same as that of the A bit without doping Sm0.5Sr0.5CoO3-delta. The perovskite composite oxide has certain application prospect in the fields of middle-low-temperature solid oxide fuel cells, oxygen separation membranes, sensors, and the like.

Technology Topic

Chemical equationRare-earth element +8

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[0016] The material of the present invention can be synthesized by solid phase reaction method, glycine-nitrate method and sol-gel method. The synthesis method of the material of the present invention is described below by taking sol-gel synthesis as an example.

[0017] The chemical composition is Sm 0.5-x Gd x Sr 0.5 CoO 3-δ System oxide, where: 0

[0018] There are 4 examples in the embodiment of the invention. To synthesize 0.05mol of Sm 0.5-x Gd x Sr 0.5 CoO 3-δ As an example, the required ingredients are shown in Table 1. The synthesis process is as follows:

[0019] 1. Weigh a certain amount of Sm according to the stoichiometric ratio 2 O 3 (Chemically pure), Gd 2 O 3 (Chemically pure) add proper amount of distilled water, and add excess HNO 3 Make Sm 2 O 3 , Gd 2 O 3 Dissolve completely, then add 5.317g Sr(NO 3 ) 2 , 14.625g Co(NO 3 ) 2 ·6H 2 O, control the PH value of the mixed solution between 1 and 2.

[0020] 2. Weigh polyethylene glycol according to the molar ratio of total metal ions: polyethylene glycol = (110-90):1 and dissolve it in water to make a 2% solution and pour into the mixed solution.

[0021] 3. Use 2mol/l ammonia to adjust the pH of the solution to between 4 and 5. The solution was placed in a water bath at 80°C and stirred to evaporate the water in the solution until a gel formed.

[0022] 4. Heat the gel in the air to 150~300℃ to make it spontaneously ignite to obtain a fluffy black powder. Grind the obtained powder into a ball mill for 2 hours and then put it in a muffle furnace at 500~900℃ for pre-burning for 2~5 hours to remove the organic components in it to obtain primary Sm 0.5-x Gd x Sr 0.5 CoO 3-δ Powder.

[0023] 5. Finally, the primary powder is calcined at 1000~1200℃ for 3~10h, then the perovskite composite oxide Sm with high conductivity is obtained. 0.5-x Gd x Sr 0.5 CoO 3-δ Powder.

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Classification and recommendation of technical efficacy words

Improve conductivity
low cost of preparation

ABO3 type perovskite composite oxides having high mixed conductivity

A composite oxide and conductivity technology, applied in the field of materials, can solve the problems of high preparation cost and complicated separation process of a single rare earth composite oxide, and achieve the effect of reducing preparation cost and high conductivity

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Description & Claims & Application Information

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