The role of Mo<SUP>6+</SUP> ion substitution on the electrical and dielectric features of SrNi-hexaferrites


ÜNAL B., Almessiere M. A., Slimani Y., Jermy R., Baykal A.

JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS, vol.34, no.17, 2023 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 34 Issue: 17
  • Publication Date: 2023
  • Doi Number: 10.1007/s10854-023-10744-9
  • Journal Name: JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Applied Science & Technology Source, Chemical Abstracts Core, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC, MEDLINE, Metadex, Civil Engineering Abstracts
  • Istanbul University Affiliated: No

Abstract

The Mo6+ ions-doped SrNi-hexaferrites, Sr0.8Ni0.2MoxFe12-2xO19 (x & LE; 0.35) HFs, were manufactured by sol-gel approach. Microstructure was analyzed through XRD, SEM-EDX, TEM, and HR-TEM. The effect of Mo6+ ions substitution on the electric-dielectric features of SrNi-HFs has been studied versus frequency and at different temperatures by impedance spectroscopy technique. It has been pointed out that the ac conductivity obeys the power law rule of f, and it is found that the dependencies of both T and substitution ratios in SrNi-HFs are highly influential for grains and grain boundaries. The levels of activation (E-a) determined from dc electrical conductivity fluctuate with the Mo6+ ion substitution into SrNi-HFs implying that the mechanism of conduction is due to the contribution of both polaron and electron hopping. The dielectric parameters were found to be f dependent at T up to 120 & DEG;C for various Mo6+ substitution ratios. The complex impedance of Cole-Cole plots shows a semicircle of different dimensions that depend on T, indicating that the resistive and capacitive responses of SrNi-HFs are because of the contribution of grain boundaries and grains formed in the HFs` structures. It has been detected that although the Mo6+ ion substitution creates relatively small differences on grain resistance, it causes a notable change in grain boundary resistance in the SrNi-HFs` system.