期刊
PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL
卷 25, 期 3, 页码 215-221出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.pnsc.2015.06.002
关键词
NiFe2O4; Neodymium; Solid-state reaction; Magnetic properties; Mossbauer spectroscopy
资金
- Operational Program Research and Development for Innovations - European Regional Development Fund [CZ.1.05/2.1.00/03.0058]
- Operational Program Education for Competitiveness - European Social Fund of the Ministry of Education [CZ.1.07/2.3.00/20.0017, CZ.I.07/2.3.00/20.0170, CZ.1.07/2.3.00/20.0155, CZ.1.07/2.3.00/20.0058]
- Youth and Sports of the Czech Republic
- internal IGA grant of Palacky University [IGA_PrF_2014017]
Nickel ferrite NiFe2O4 is a typical soft magnetic ferrite with high electrical resistivity used as high frequency magnetic material. Neodymium (Nd3+) doped NiFe2O4 materials were fabricated using solid state reaction. The properties of the obtained material were investigated by X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Fourier-Transform Infrared Spectroscopy (FT-IR), magnetic measurements on SQUID and Mossbauer spectroscopy. It was found that the material consists of two different phases: Nd3+ doped NiFe2O4 and NdFeO3. The Nd3+ ions occupy cation sites of the NiFe2O4 inverse spinel structure. NdFeO3 phase occurred when the level of Nd3+ atoms exceed a percolation limit. The presence of both phases was confirmed by SEM observations. The Mossbauer spectra analysis showed two sextets, which can be ascribed to iron atoms in tetrahedral and octahedral positions. From their intensities it is concluded that Nd3+ occupies octahedral sites in the spinel structure of NiFe2O4, which were originally occupied by Ni2+. (C) 2015 The Authors. Published by Elsevier GmbH.
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