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Dynamics of Electron Density, and Dielectric Properties of CoFe2O4 Nanoparticles Influenced by Substitution of La3+ at Fe3+

Students & Supervisors

Student Authors
Md. Abdul Malek Sobuj
BSc in Computer Science & Engineering, FST
Frank Heaven Mondol
BSc in Computer Science & Engineering, FST
Syed Sabit Hossain
BSc in Computer Science & Engineering, FST
Supervisors
Dr. Md. Sarowar Hossain
Assistant Professor, Faculty, FST
Dr. Humayra Ferdous
Associate Professor, Department Head, FST

Abstract

Cobalt ferrite (CoFe2O4) has been subjected to the existence or nonexistence of ferroelectric properties. The nominal composition of CoLaxFe2-xO4 (where, x = 0, 0.05, 0.10, 0.15, 0.20, 0.25, and 0.30) has been synthesized by the sol-gel method. The synthesized grain sizes varied from 60 nm to 80 nm. The electron density plots obtained using Rietveld refinement of the x-ray diffraction data showed the displacement of the Co and Fe ions which is highly influenced by the substitution of La3+ at Fe3+. It is also observed that the AC conductivity increases with the increase of La3+ amount in the parent sample (CoFe2O4) which is dominated by frequency. The contribution of grain and grain boundaries on dielectric relaxation has been investigated at room temperature (25℃). The electric permittivity (ε) is also enhanced due to the substitution La3+ at Fe3+. Finally, the composition CoLa0.10Fe1.9O4 sintered at 900oC shows the highest electric permittivity (ε^' ) with low dielectric loss (tanδ) and finds a suitable application for the strain gauge, made by evaporating a small amount of metal onto the surface of a thin sheet of this material.

Keywords

Microstructure Electron-density Conductivity Dielectric relaxation Permittivity

Publication Details

  • Type of Publication: Conference
  • Conference Name: International Conference on Physics – 2024
  • Date of Conference: 05/09/2024 - 05/11/2024
  • Venue: Bangladesh Atomic Energy Centre, Dhaka
  • Organizer: Organized by: Bangladesh Physical Society
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