Abstract
A series of soft ferrites in the system Ni1 - xTbxFe2O4 (0 ≤ x ≤ 0.2), was prepared by a standard ceramic technique. The influence of terbium content was investigated by means of X-ray diffraction, Fourier Transform Infrared (FTIR) spectroscopy and scanning electron microscopy. The X-ray diffraction analysis reveals that the samples have a cubic spinel (single phase) structure for 0 ≤ x ≤ 0.08; for x > 0.08 a small peak of orthorhombic phase (TbFeO3) appears and becomes more conspicuous with increased terbium substitution. The lattice parameter changes in a non-linear way as a function of terbium content which may be attributed to differences in the ionic radii of the cations involved and the solubility limit of terbium ions. A gradual increase in the bulk density was observed with the increase of terbium concentration, from 5.13 g/cm3 to 5.69 g/cm3. FTIR absorption spectra of the Ni-Tb-Fe-O system were investigated in the wave number range 370-1500 cm- 1. Each spectrum exhibited two main absorption bands, thereby confirming the spinel structure.
Original language | English |
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Pages (from-to) | 73-78 |
Number of pages | 6 |
Journal | Materials Characterization |
Volume | 60 |
Issue number | 1 |
DOIs | |
Publication status | Published - Jan 2009 |
Keywords
- Chemical synthesis
- Infrared spectroscopy
- Microstructure
- Ni-Tb ferrites
- X-ray diffraction