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

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

CERAMICS INTERNATIONAL, cilt.46, sa.15, ss.24605-24614, 2020 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 46 Sayı: 15
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1016/j.ceramint.2020.06.249
  • Dergi Adı: CERAMICS INTERNATIONAL
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.24605-24614
  • İstanbul Üniversitesi Adresli: Hayır

Özet

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 (E-g) 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.