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La1-xNdxFeO3 nanocrystalline material and preparation method thereof

A nanocrystalline material, 3·nh2o technology, used in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of insufficient powder, limited application of perovskite composite oxides, low efficiency, etc.

Inactive Publication Date: 2018-08-03
HAINAN MEDICAL COLLEGE
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] In the prior art, although there is La 1-x Nd x FeO 3 High-temperature solid-phase reaction preparation method, but the disadvantages of high-temperature solid-phase method are high energy consumption, low efficiency, powder is not fine enough, easy to mix impurities, etc.
So far, no citric acid sol-gel method has been used to prepare A-site Nd 3+ doped LaFeO 3 Preparation of nanocrystalline materials, constrained perovskite (ABO 3 ) Application of composite oxide

Method used

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  • La1-xNdxFeO3 nanocrystalline material and preparation method thereof
  • La1-xNdxFeO3 nanocrystalline material and preparation method thereof
  • La1-xNdxFeO3 nanocrystalline material and preparation method thereof

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preparation example Construction

[0033] A kind of La provided by the invention 1-x Nd x FeO 3 The preparation method of nanocrystalline material comprises the following steps:

[0034] S1, dissolving citric acid in deionized water, stirring and dissolving completely to obtain a citric acid solution;

[0035] S2, weigh La(NO 3 ) 3 ·nH 2 O, Fe(NO 3 ) 3 9H 2 O, Nd(NO 3 ) 3 ·6H 2 O, added to the citric acid solution obtained in S1, wherein, La(NO 3 ) 3 ·nH 2 O, Fe(NO 3 ) 3 9H 2 O, Nd(NO 3 ) 3 ·6H 2 The molar ratio of O is (1-x):1:x, and the value range of x is 0.0 to 0.25, then add deionized water, stir and completely dissolve to obtain a perovskite oxide mixed solution;

[0036] S3, adding ammonia water to the perovskite oxide mixed solution obtained in S2, and stirring until pH = 6.9-7.1, to obtain a dark green and clear reaction solution;

[0037] 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, stan...

Embodiment 1

[0041] A La 1-x Nd x FeO 3 (x=0.05) the preparation method of nanocrystalline material, concrete steps are as follows:

[0042] S1, take 0.04mol of citric acid and dissolve it in 20ml of deionized water, stir and dissolve completely to obtain a colorless, transparent and clear citric acid solution;

[0043] S2, weigh 0.019mol of La(NO 3 ) 3 ·nH 2 O, 0.02mol of Fe(NO 3 ) 3 9H 2 O, 0.001mol of Nd(NO 3 ) 3 ·6H 2 O was added to the citric acid solution obtained in S1, then 30ml of deionized water was added, and after stirring to dissolve completely, a deep wine red clear perovskite oxide mixed solution was obtained;

[0044] S3, add ammonia water to the perovskite oxide 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 60-70 ml) is obtained, and the concentration of the ammonia water is 25 ~28g / 100g;

[0045] S4, put the reaction solution obtained in S3 in a 60°C water bath,...

Embodiment 2

[0048] A La 1-x Nd x FeO 3 (x=0.10) the preparation method of nanocrystalline material, concrete steps are as follows:

[0049] S1, take 0.04mol of citric acid and dissolve it in 20ml of deionized water, stir and dissolve completely to obtain a colorless, transparent and clear citric acid solution;

[0050] S2, weigh 0.018mol of La(NO 3 ) 3 ·nH 2 O, 0.02mol of Fe(NO 3 ) 3 9H 2 O, 0.002mol of Nd(NO 3 ) 3 ·6H 2 O was added to the citric acid solution obtained in S1, then 30ml of deionized water was added, and after stirring to dissolve completely, a deep wine red clear perovskite oxide mixed solution was obtained;

[0051] S3, add ammonia water to the perovskite oxide 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 60-70 ml) is obtained, and the concentration of the ammonia water is 25 ~28g / 100g;

[0052] S4, put the reaction solution obtained in S3 in a 60°C water bath,...

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Abstract

The invention belongs to the technical field of perovskite material preparation, and particularly relates to a La1-xNdxFeO3 nanocrystalline material and a preparation method thereof. La(NO3)3.nH2O, Fe(NO3)3.9H2O and Nd(NO3)3.6H2O are added into a prepared citric acid solution; then, ammonium hydroxide is added and water bath, drying and calcination are performed to obtain a composite oxide material. An accurate, controllable and easily-controlled citrate solution-gel method is adopted to synthesize Nd<3+> ion double doped La1-xNdxFeO3 nanometer particles at a low temperature; the obtained sample is of a single phase and an orthorhombic system structure, a spatial group is Pnma, and Mg<2+> and Ca<2+> jointly replace La<3+> to inhibit the growth of particles. The La1-xNdxFeO3 nanocrystallinematerial has a wide application prospect in fields including electric and magnetic sensors, industrial catalysis, air-sensitive materials, information storage, spin-electronic devices and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of perovskite materials, in particular to a La 1-x Nd x FeO 3 Nanocrystalline materials and methods for their preparation. 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 catalytic and gas sensing activity, suitable thermal expansion c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00B82Y30/00
CPCB82Y30/00C01G49/0081C01P2002/60C01P2002/72C01P2002/80C01P2002/82C01P2004/03C01P2006/10C01P2006/42
Inventor 林卿杨芳杨幸星许建梅何云
Owner HAINAN MEDICAL COLLEGE
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