Low dielectric loss, and enhanced magneto-dielectric properties of Cu0.5Cd0.5-xCoxFe2O4 ferrites via Co2+ substitution. (March 2023)

• Record Type: Journal Article
• Authors: Rehman, Atta Ur; Sharif, Sehrish; Hegazy, H.H.; Morley, Nicola; Amin, Nasir; Akhtar, Maria; Arshad, Muhammad Imran; Farooq, Z.; Munir, Z.; Munir, T.
• Is Part Of: Materials today communications. Volume 34(2023)
• Publication Date: 2023-03
• Subjects: Sol-gel auto combustion -- Single-phase -- Resistivity -- Magnetization -- Microwave; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2023.105371
• Languages: English
• ISSNs: 2352-4928

Abstract

Abstract: Spinel ferrites (SFs) with composition Cu 0.5 Cd 0.5−x Co x Fe 2 O 4 ( x = 0.0, 0.125, 0.25, 0.375, 0.5) were prepared via the effective and low-cost sol-gel auto combustion process. X-ray diffraction confirmed the single-phase spinel matrix. Furthermore, with increasing Co 2+ ions doping the lattice constant ( a ) was reduced and crystal size increased. The variation in two major absorption and vibration bands at tetrahedral and octahedral sites also confirmed the substitution of dopant ions in lattice sites. Moreover, the bandgap energy was measured using UV–visible analysis and was increased with the doping of Co 2+ and was 2.44 eV for x = 0.375. At 313 K, the highest electrical resistivity and activation energy were 7.17 × 10 8 Ω cm and 0.44 eV, respectively for the sample x = 0.375. The maximum dielectric constant and tangent loss was observed, while the Q factor was minimum for sample x = 0.375 (as clear from the graphical abstract). The coercivity was 536.82 Oe and saturation magnetization had a value of 128.49 emu/g with microwave frequency 28.40 GHz for sample x = 0.375. The following results suggested that the sample with x = 0.375 is useful for high-frequency resonant circuits and multilayer chip inductors applications. Graphical Abstract: ga1 Highlights: Low-cost, and effective sol-gel auto combustion synthesis of Cu 0.5 Cd 0.5−x Co x Fe 2 O 4 . The crystal size was observed at 46.61 nm and the optical bandgap was found 2.44 eV for sample x = 0.375. The highest electrical resistivity and the activation energy were 7.17 × 10 8 Ω cm and 0.44 eV for sample x = 0.375. The maximum dielectric tangent loss and minimum Q factor were observed for x = 0.375. The saturation magnetization was maximum for sample x = 0.375.