Structural, Optical and Electrical Properties of Cu0.6CoxZn0.4−xFe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4) Soft Ferrites

Abstract

A series of cobalt-inserted copper zinc ferrites, Cu0.6CoxZn0.4−xFe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4) having cubic spinel structure were prepared by the coprecipitation method. Various characterization techniques, including XRD, FTIR, UV-vis and I–V were used to investigate structural optical and electrical properties, respectively. The lattice constant was observed to be decreased as smaller ionic radii Co2+ (0.74 Å) replaced the higher ionic radii Zn2+ (0.82 Å). The presence of tetrahedral and octahedral bands was confirmed by FTIR spectra. Optical bandgap energy was determined in the range of 4.44–2.05 eV for x = 0.0 to 0.4 nanoferrites, respectively. DC electrical resistivity was measured and showed an increasing trend (5.42 × 108 to 6.48 × 108 Ω·cm) with the addition of cobalt contents as cobalt is more conductive than zinc. The range of DC electrical resistivity (108 ohm-cm) makes these nanomaterials potential candidates for telecommunication devices.

Tuning the Magnetic Behavior of Zinc Ferrite via Cobalt Substitution: A Structural Analysis

“…Variation of particle size with the cobalt content is presented in Figure b. This is because the ionic radius of Zn 2+ (0.82 Å) is larger than that of Co 2+ (0.78 Å) . The crystallite size decrease may be interpreted as the slowing down of crystal growth when the cobalt (Co 2+ ionic radius 0.78 Å) content increases because of dopant-induced distortion .…”

Comprehensive Improvement of Various Features of Cu–Cd Ferrites (Cu0.5Cd0.5Fe2–xCexO4) by Cerium (Ce3+) Ion Substitution

“…Such factors may cause a rapid decrease in the crystallite size. The lattice parameters 29 were observed using the relationship…”

“…Such factors may cause a rapid decrease in the crystallite size. The lattice parameters were observed using the relationship ( a = d italichkl ( h 2 + k 2 + l 2 ) ) , and the lattice parameters were enhanced from 8.419 to 8.457 Å with the introduction of cerium; the trend inferred in the case of ionic radii is Fe 3+ (0.645 Å) and Ce 3+ (1.034 Å). When iron is replaced by cerium, the lattice constant increases.…”

Impact of Cr doping on the structural and optoelectronic properties of a CsPbIBr2 perovskite solar cell

“…26,27 Compared to Cr ions, Pb ions could have a bigger ionic radius. 28 The bigger Pb ions in Cr can deform the crystal lattice structure, increasing the lattice spacing and crystal size when Pb is replaced. The difference in ionic radii between Pb 2+ and Cr 3+ induces stress in the crystal, potentially promoting recrystallization and leading to a larger grain size.…”