Electrical properties of La(3+)and Y3+ ions substituted Ni0.3Cu0.3 Zn0.4Fe2O4 nanospinel ferrites


Almessiere M. A. , Unal B., Slimani Y., Korkmaz A. , Baykal A., Ercan I.

RESULTS IN PHYSICS, vol.15, 2019 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 15
  • Publication Date: 2019
  • Doi Number: 10.1016/j.rinp.2019.102755
  • Title of Journal : RESULTS IN PHYSICS
  • Keywords: Spinel ferrites, Rare earth substitutions, Conductivity, Dielectric properties, ELECTROMAGNETIC PROPERTIES, DIELECTRIC-CONSTANT, MAGNETIC-PROPERTIES, NANOPARTICLES, CONDUCTIVITY, MICROWAVE, FILMS

Abstract

La-Y substituted Ni-Cu-Zn nanospinel ferrites (NSFs) having the following formula Ni0.3Cu0.3Zn0.4LaxYxFe2-2xO4 (x = 0.0-0.10) were fabricated prepared by ultrasonic irradiation approach. The X-ray powder diffractometer (XRD), scanning electron microscope (SEM) and Fourier-transform infrared spectroscopy (FT-IR) were utilized to analyze the structure, vibration bands and morphology. The impedance spectroscopy technique was used for the analysis of electrical and dielectric properties of La3+ and Y3+ ions co-substituted Ni0.3Cu0.3Zn0.4Fe2O4 NSFs. Some important parameters such as ac conductivity, activation energy, dielectric constant and dielectric loss were examined as functions of frequencies and temperatures for a variety of La and Y co-substitution ratios. In general, ac conductivity is observed to fluctuate slightly with the elevated temperatures while its fluctuation level decreases somehow with an increase in co-substitution ratios. Furthermore, the frequency dependence of dielectric functions could be described by Koop's models based on Maxwell-Wagner theory, which elucidates the correlation between the polarizability coefficient and dielectric constant in inhomogeneous double-layer structures.