Preparation method of A-site magnesium-calcium double-doped lanthanum ferrite composite oxide material

A composite oxide and double-doping technology, which is applied in iron compounds, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as limitations, and achieve the effects of easy operation, convenient operation, and simple synthesis conditions

Inactive Publication Date: 2018-03-30
HAINAN MEDICAL COLLEGE
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Problems solved by technology

[0004] In the prior art, there is no report on the use of sol-gel method to synthesize LaFeO 3 A-site alkaline earth dual-phase doping and the effect of different calcination temperature and time on the magnetic properties of doped samples, such as Ca 2+ and Mg 2+ , Mg 2+ and Ba 2+ and other co-doping, limiting the perovskite (ABO 3 ) Application of composite oxides

Method used

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  • Preparation method of A-site magnesium-calcium double-doped lanthanum ferrite composite oxide material
  • Preparation method of A-site magnesium-calcium double-doped lanthanum ferrite composite oxide material
  • Preparation method of A-site magnesium-calcium double-doped lanthanum ferrite composite oxide material

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preparation example Construction

[0030] A preparation method of an A-site magnesium-calcium double-doped lanthanum ferrite composite oxide material provided by the present invention comprises the following steps:

[0031] S1, dissolving citric acid in deionized water, stirring and dissolving completely to obtain a citric acid solution;

[0032] S2, weigh La(NO 3 ) 3 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O, Mg(NO 3 ) 2 ·6H 2 O, Ca(NO 3 ) 2 4H 2 O, join in the citric acid solution that S1 obtains, then add deionized water, after stirring and dissolving completely, obtain perovskite mixed solution;

[0033] S3, adding ammonia water to the perovskite mixed solution obtained in S2, and stirring until pH = 6.9-7.1, to obtain a dark green clear reaction solution;

[0034] S4, placing the reaction solution obtained in S3 in a water bath at 40-80°C, stirring for 2-5 hours to obtain a wet gel, stopping stirring, standing still, and drying to obtain a dry gel;

[0035] S5, adding absolute ethanol to the dry gel obtaine...

Embodiment 1

[0040] A method for preparing an A-site magnesium-calcium double-doped lanthanum ferrite composite oxide material, the specific steps are as follows:

[0041] S1, take 0.04mol citric acid and dissolve it in 20ml deionized water, stir and dissolve completely to obtain a colorless, transparent and clear citric acid solution;

[0042] S2, weigh 0.017mol of La(NO 3 ) 3 ·6H 2 O, 0.02mol of Fe(NO 3 ) 3 9H 2 O, 0.003mol Mg(NO 3 ) 2 ·6H 2 O, join in the citric acid solution that S1 obtains, then add 30ml deionized water, after stirring and dissolving completely, obtain dark wine red clear perovskite mixed solution;

[0043] S3, add ammonia water to the perovskite mixed solution obtained in S2, stir until the solution pH=7 is measured by a precision pH meter, and a dark green clear reaction solution (about 60-70ml) is obtained, and the concentration of the ammonia water is 25-28g / 100g;

[0044] S4, put the reaction solution obtained in S3 in a 60°C water bath, stir for 3 hou...

Embodiment 2

[0047] A method for preparing an A-site magnesium-calcium double-doped lanthanum ferrite composite oxide material, the specific steps are as follows:

[0048] S1, take 0.04mol citric acid and dissolve it in 20ml deionized water, stir and dissolve completely to obtain a colorless, transparent and clear citric acid solution;

[0049] S2, weigh 0.017mol of La(NO 3 ) 3 ·6H 2 O, 0.02mol of Fe(NO 3 ) 3 9H 2 O, 0.0024mol of Mg(NO 3 ) 2 ·6H 2 O, 0.0006mol Ca(NO 3 ) 2 4H 2 O was added to the citric acid solution obtained in S1, then 30ml of deionized water was added, and after stirring and dissolving completely, a deep wine red clear perovskite mixed solution was obtained;

[0050] S3, add ammonia water to the perovskite mixed solution obtained in S2, stir until the solution pH=7 is measured by a precision pH meter, and a dark green clear reaction solution (about 60-70ml) is obtained, and the concentration of the ammonia water is 25-28g / 100g;

[0051] S4, put the reaction...

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Abstract

The invention belongs to the technical field of preparation of lanthanum ferrite composite oxide materials, and particularly discloses a preparation method of an A-site magnesium-calcium double-dopedlanthanum ferrite composite oxide material. The preparation method comprises the following steps of adding La(NO3)3.6H2O (lanthanum nitrate), Fe(NO3)3.9H2O (ferric nitrate), Mg(NO3)2.6H2O (magnesium nitrate) and Ca(NO3)2.4H2O (calcium nitrate) into a prepared citric acid solution; then, adding ammonium hydroxide, treating in a water bath, drying, and calcining, so as to obtain the composite oxidematerial. The preparation method has the advantages that the Mg<2+> ion and Ca<2+> ion double-doped La0.85Mg0.15-xCaxFeO3 nanoparticle is synthesized by an accurate, controllable and easy nitrate saltsol-gel method at low temperature; the obtained samples has a single phase, and is of an orthorhombic crystal system structure, the space group is Pnma, Mg<2+> and Ca<2+> are used for replacing La<3+>, and the growth of particles is inhibited; the A-site magnesium-calcium double-doped lanthanum ferrite composite oxide material has wide application prospect in fields of electricity, magnetic sensors, industrial catalyzing, gas-sensitive material, information storage, spin-electron devices, and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of lanthanum ferrite composite oxide materials, and in particular relates to a preparation method of an A-site magnesium-calcium double-doped lanthanum ferrite composite oxide material. Background technique [0002] Lanthanum ferrite (LaFeO 3 ) is a typical perovskite (ABO 3 ) Orthorhombic structure rare earth composite metal oxide, the space group is Pbnm at room temperature. The Fe-O-Fe bond angle (θ≈156°) in this structure is the largest bond angle in the perovskite ferrite system, so LaFeO 3 is the Neel temperature in the ferrite system (T N ≈740K) the highest magnetic material. LaFeO 3 It has a G-type antiferromagnetic structure and is one of the few single-phase multiferroic materials with both antiferromagnetism and ferroelectricity. LaFeO 3 Due to its unique advantages such as special crystal structure, unique electromagnetic, high electron-ion mixed conductivity, excellent cata...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00B82Y40/00
CPCC01G49/009C01P2002/34C01P2002/72C01P2002/82C01P2004/64C01P2006/10C01P2006/42
Inventor 林卿杨芳许建梅杨幸星何云
Owner HAINAN MEDICAL COLLEGE
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