June 21, 2024
Hamed Bahiraei

Hamed Bahiraei

Academic rank: Associate Professor
Address:
Education: Ph.D in فیزیک
Phone: 09376003569
Faculty: science

Research

Title Effect of Ni Substitution on Optical Transitions and Magnetic Behavior of Mesoporous NixCo3xO4 (0 £ x £ 1) Thin Films Prepared by Electrophoretic Deposition
Type Article
Keywords
Nickel cobaltite, hydrothermal method, electrophoretic deposition (EPD), optical transition
Journal Journal of Electronic Materials
Researchers Hamed Bahiraei

Abstract

High-quality nickel cobaltite (NixCo3xO4, 0 £ x £ 1) nanopowders with various nickel contents have been prepared by a facile hydrothermal method, calcined in air at 300C for 2 h, then coated on the surface of indium tin oxide sheets by electrophoretic deposition. The optical, microstructural, and magnetic properties were characterized by x-ray diffraction (XRD) analysis, ultraviolet–visible (UV–Vis) spectrophotometry, field emission-scanning electron microscopy (FE-SEM), and vibrating-sample magnetometry. The XRD patterns of the pure and Ni-doped Co3O4 powders revealed the formation of single-phase spinel structure, without any impurity phases for all samples. The position and intensity of various absorption bands in the UV–Vis spectra were influenced by the distribution of Co2+ and Ni2+ ions at tetrahedral sites of the spinel structure, revealing that O2 fi Co2+ and O2 fi Ni2+ transition sites were affected by increasing the Ni2+ content, thereby changing the optical properties of NixCo3xO4. Vibrating-sample magnetometry analysis revealed that the magnetic nature of the prepared nanopowders changed from anti-ferromagnetic to very weak ferrimagnetic.