Structural and physical properties of Ni-Tb-Fe-O system

M. Azhar Khan, M. U. Islam, M. Ishaque, I. Z. Rahman, A. Genson, S. Hampshire

Research output: Contribution to journalArticlepeer-review

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 languageEnglish
Pages (from-to)73-78
Number of pages6
JournalMaterials Characterization
Volume60
Issue number1
DOIs
Publication statusPublished - Jan 2009

Keywords

  • Chemical synthesis
  • Infrared spectroscopy
  • Microstructure
  • Ni-Tb ferrites
  • X-ray diffraction

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