Structural, magneto-optical properties and cation distribution of SrBixLaxYxFe12-3xO19 (0.0 <= x <= 0.33) hexaferrites

Auwal I. A., Gungunes H., Guner S., Shirsath S. E., Sertkol M., Baykal A.

MATERIALS RESEARCH BULLETIN, cilt.80, ss.263-272, 2016 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 80
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1016/j.materresbull.2016.03.028
  • Dergi Adı: MATERIALS RESEARCH BULLETIN
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.263-272
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

SrBixLaxYxFe12-3xO19 (0.0 <= x <= 0.33) hexaferrites were produced via sol-gel auto combustion. XRD patterns show that all the samples are single-phase M-type strontium hexaferrite (SrM). The magnetic hysteresis (sigma-H) loops revealed the ferromagnetic nature of nanoparticles (NPs). The coercive field decreases from 4740 Oe to 2720 Oe with increasing ion content. In particular, SrBixLaxYxFe12-3xO19 NPs with x=0.0, 0.1, 0.2 have suitable magnetic characteristics (sigma(s) = 62.03-64.72 emu/g and H-c = 3105-4740 Oe) for magnetic recording. The intrinsic coercivity (H-ci) above 15000 Oe reveals that all samples are magnetically hard materials. Tauc plots were used to specify the direct optical energy band gap (E-g) of NPs. The E-g values are between 1.76 eV and 1.85 eV. Fe-57 Mossbauer spectroscopy data, the variation in line width, isomer shift, quadrupole splitting, relative area and hyperfine magnetic field values on Bi3+ La3+ and Y3+ substitutions have been determined. (C) 2016 Elsevier Ltd. All rights reserved.