Factors controlling phase formation of novel Sr-based Y-type hexagonal ferrite nanoparticles

R. Tholkappiyan, K. Vishista, Fathalla Hamed

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

New Sr-based Y-type nanocrystalline hexagonal ferrites with a nominal chemical composition of Sr2Mg2Fe12O22 (Sr2Y) were prepared by autocombustion from mixtures of Sr(NO3)2, Mg(NO3)2·6H2O and Fe(NO3)3·9H2O. The newly prepared Sr2Y nanocrystalline particles were characterized by powder X-ray diffraction (XRD). A well crystalline phase of Sr2Y with hexagonal crystal structure was observed. Fourier transform infrared spectroscopy (FTIR) studies revealed the information about the positions of the ions and their bonds within the lattice structure of the Sr2Y. The chemical elements and their oxidation states in the Sr2Y hexaferrites were determined using X-ray photoelectron spectroscopy (XPS). The XRD, FTIR and XPS studies confirmed the formation of Sr2Mg2Fe12O22 hexaferrites. The morphology and porosity of the prepared Sr2Y nanocrystalline Sr2Y hexaferrite particles were studied by field emission scanning electron microscopy. The magnetic properties of Sr2Y hexaferrites showed dependence on the methods of preparation conditions and calcination treatments. The values of coercivity, saturation magnetization and retentivity were in the range of 21.33-19.66 kA m-1, 42.44-38.72 emu g-1 and 10.05-13.19 emu g-1 respectively.

Original languageEnglish
Article number27
JournalPramana - Journal of Physics
Volume88
Issue number2
DOIs
Publication statusPublished - Feb 2017

Keywords

  • Combustion process
  • Glycine
  • Hexagonal ferrites
  • Oxidation state
  • X-ray photoelectron spectroscopy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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