Annealing temperature dependent structural and magnetic properties of MnFe2O4 nanoparticles grown by sol-gel auto-combustion method

被引：61

作者：

Bhandare, S. V. ^{[1
]}

Kumar, R. ^{[2
]}

Anupama, A., V ^{[2
]}

Choudhary, H. K. ^{[2
]}

Jali, V. M. ^{[1
]}

Sahoo, B. ^{[2
]}

机构：

[1] Gulbarga Univ, Dept Phys, Gulbarga 585106, India

[2] Indian Inst Sci, Mat Res Ctr, Bangalore 560012, Karnataka, India

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2017年 / 433卷

关键词：

Manganese ferrite; Sol-gel auto-combustion method; Superparamagnetism; HYPERFINE FIELD DISTRIBUTIONS; POLYANILINE-MNFE2O4-CTAB NANOCOMPOSITE; CATION DISTRIBUTION; IONIC LIQUID; FERRITE; VALIDITY; ALLOYS; SIZE;

D O I：

10.1016/j.jmmm.2017.02.040

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Manganese ferrite (MnFe2O4) nanoparticles were synthesized by sol-gel auto-combustion method using manganese nitrate and ferric nitrate as precursors and citric acid as a fuel. Scanning electron micrographs show irregularly shaped morphology of the particles. The as-prepared samples were annealed at 400, 500, 600 and 800 degrees C for 2 h in air. The phase identification and structural characterizations were performed using powder X-ray diffraction technique along with Mossbauer spectroscopy. Magnetization loops and Fe-57 Mossbauer spectra were measured at RT. After annealing the sample at or below similar to 500 degrees C, we observed two different spinel phases corresponding to two different lattice parameters. This is originating due to the partial oxidation of Mn2+ to Mn3+. At high annealing temperatures (similar to 600 degrees C or above) the spinel MnFe2O4 phase decomposes into crystalline alpha-Mn2O3 and alpha-Fe2O3 phases, and amorphous FeO phase. (c) 2017 Elsevier B.V. All rights reserved.

引用

页码：29 / 34

页数：6

共 32 条

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