Electrical and optical properties of Ni0·5Co0.5-xCdxNd0.02Fe1·78O4 (x ≤ 0.25) spinel ferrite nanofibers

Alahmari F., Almessiere M., ÜNAL B., Slimani Y., Baykal A.

Ceramics International, vol.46, no.15, pp.24605-24614, 2020 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 46 Issue: 15
  • Publication Date: 2020
  • Doi Number: 10.1016/j.ceramint.2020.06.249
  • Journal Name: Ceramics International
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Page Numbers: pp.24605-24614
  • Keywords: Ac conductivity, Dielectric property, Electrospinning, Ferrite nanofibers, Optical properties
  • Istanbul Gelisim University Affiliated: Yes

Abstract

This study aimed to investigate the optical, electric and dielectric properties of the Ni0·5Co0.5-xCdxNd0.02Fe1·78O4 (x ≤ 0.25) NFs prepared via electrospinning process. Diffuse reflectance spectroscopic (DRS) measurements were performed on pristine and all Cd-substituted NFs samples. Direct bandgap energies (Eg) were extracted from the Tauc fits which were estimated in a range between 1.65 and 1.85eV. The electrical conduction mechanism and dielectric functions of Ni0·5Co0.5-xCdxNd0.02Fe1·78O4 NFs were comprehensively examined as functions of frequency, temperature and Cd ions substitution ratio in a 3D semi-logarithmic plot using the complex impedance spectroscopy technique. The substitution ratio has a robust influence on dielectric parameters including dielectric loss, dielectric constant, and dissipation factor while the Cd ion substitution has a weak effect on the conductivity mechanism. The activation energy values changed to a level lower than 400 meV with increasing the “x” values.