Spectral, electrical, and dielectric characterization of Ce-doped Co-Mg-Cd spinel nano-ferrites synthesized by the sol-gel auto combustion method

Zakir, Ruqayya; Iqbal, Sadia Sagar; Rehman, Atta Ur; Nosheen, Sumaira; Ahmad, Tasawer Shahzad; Ehsan, Nimra

doi:10.1016/j.ceramint.2021.07.016

Cited by 67 publications

(19 citation statements)

References 38 publications

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“…The "γ" values are smaller than the hopping lengths, which could be attributed to the creation of small polarons [30]. The X-ray (𝑑 𝑋 ), bulk (𝑑 𝐵 ) and relative (𝑑 𝑅 ) densities were calculated by the following relations [29,31];…”

Section: X-ray Diffraction (Xrd) Studymentioning

confidence: 99%

Impact of Co2+ on the spectral, optoelectrical, and dielectric properties of Mg0.25Ni0.25Cu0.5−xCoxFe1.97La0.03O4 ferrites prepared via sol–gel auto-combustion route

Abbas

Rehman

Gull

et al. 2022

J Sol-Gel Sci Technol

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Spinel ferrites are attaining huge importance in the modern era, due to their incredible properties, which means they are widely used in various fields. Therefore, in this paper a costeffective and environmentally friendly preparation of 𝑀𝑔 0.25 𝑁𝑖 0.25 𝐶𝑢 0.5−𝑥 𝐶𝑜 𝑥 𝐹𝑒 1.97 𝐿𝑎 0.03 𝑂 4 (x = 0.0, 0.125, 0.25, 0.375, and 0.5) ferrites via the sol-gel auto-combustion method were carried out. How the structural and functional properties varied with the Cu to Co ratio was studied. It was found that the crystallite size (D) was reduced from 47.2 to 27.6 nm as the Co 2+ increased from x = 0.0 to 0.5. While the two major absorption bands including the higher frequency band (υ1) and lower frequency band (υ2) lie in the range of 573.80 -538.65 cm -1 and 470.37 -405.65 cm -1 belong to the spinel matrix. Five active Raman modes were found in the range of wave number 200 -800 cm -1 corresponds to the sublattices of the spinel structure.The optical bandgap increased from 0.85 eV to 1.33 eV for x = 0.0 to x = 0.25 and then observed optical band gap was 1.15 eV and 1.46 eV for x = 0.375 to x = 0.5. The resistivity (ρ) was minimum for Co 2+ concentration x = 0.25 at low temperature, while at high temperature the resistivity (ρ) was maximum for Co 2+ doping x = 0.25. The temperature coefficient of resistance percentage (TCR %) was −2.66%/K at 513 K for x = 0.25, as shown in the graphical abstract.At lower frequencies, the impedance was observed maximum for Co 2+ doping x = 0.125 and minimum for x = 0.375. These findings indicate that the as-prepared ferrites are a potential candidate for optoelectrical and bolometric devices.

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Section: X-ray Diffraction (Xrd) Studymentioning

confidence: 99%

Impact of Co2+ on the spectral, optoelectrical, and dielectric properties of Mg0.25Ni0.25Cu0.5−xCoxFe1.97La0.03O4 ferrites prepared via sol–gel auto-combustion route

Abbas

Rehman

Gull

et al. 2022

J Sol-Gel Sci Technol

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“…The strain and packing factor percentage were reduced while the dislocation density and specific surface area were increased with the substitution of dopant ions as seen in Table 1. Hopping lengths LA and LB are calculated by using given formulas [28,31];…”

Section: Xrd Analysismentioning

confidence: 99%

Sol–Gel Auto-combustion Preparation of M2+ = Mg2+, Mn2+, Cd2+ Substituted M0.25Ni0.15Cu0.25Co0.35Fe2O4 Ferrites and Their Characterizations

Aslam

Rehman

Amin

et al. 2021

J Supercond Nov Magn

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Cost-effective and controllable synthesis of M0.25Ni0.15Cu0.25Co0.35Fe2O4 (M 2+ = Mg 2+ , Mn 2+ , and Cd 2+ ) ferrites via the sol-gel auto-combustion technique. The impact of divalent cations on the structural, dielectric, optoelectrical properties of ferrites was examined by XRD, FTIR, Raman, LCR, UV-vis, and two probe I-V measurement techniques. The crystallite size was 52.66 nm and the minimum specific surface area was observed 5.1507 m 2 /g for Mg 2+ doped NCCF ferrite. The FTIR and Raman analysis also confirmed the substitution of divalent cations (M 2+ = Mg 2+ , Mn 2+ , and Cd 2+ ) at their respective lattice sites. The maximum energy bandgap was 1.67 eV Mg 2+ doped NCCF ferrite as compared to other divalent ion-doped ferrites. The dielectric loss decreased while the ac conductivity increased with increasing frequency and the minimum values were observed for Mg 2+ doped NCCF ferrite. The activation energy was observed maximum for Mg 2+ doped NCCF ferrite (0.2234 eV). Due to incredible properties including small specific surface area, large energy band gap, high resistivity and loss dielectric loss of Mg 2+ doped NCCF ferrite have potential applications in different fields.

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“…For the synthesis of spinel matrix nano ferrites, the microemulsion process [10], the selfigniting auto combustion route [11,12], the hydrothermal method [13], co-precipitation [14][15][16][17], and a lot more other techniques have been used. Sol-gel auto combustion route was observed to be better because of fine surface morphology, better homogeneity of particles, excellent properties, and low-temperature preparation [18].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of spectral, optoelectrical, dielectric, magnetic, and morphological properties of RE3+ (La3+, and Ce3+) and Co2+ co-doped Zn0.75Cu0.25Fe2O4 ferrites

Rehman

Amin

Tahir

et al. 2022

Materials Chemistry and Physics

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Spectral, electrical, and dielectric characterization of Ce-doped Co-Mg-Cd spinel nano-ferrites synthesized by the sol-gel auto combustion method

Cited by 67 publications

References 38 publications

Impact of Co2+ on the spectral, optoelectrical, and dielectric properties of Mg0.25Ni0.25Cu0.5−xCoxFe1.97La0.03O4 ferrites prepared via sol–gel auto-combustion route

Impact of Co2+ on the spectral, optoelectrical, and dielectric properties of Mg0.25Ni0.25Cu0.5−xCoxFe1.97La0.03O4 ferrites prepared via sol–gel auto-combustion route

Sol–Gel Auto-combustion Preparation of M2+ = Mg2+, Mn2+, Cd2+ Substituted M0.25Ni0.15Cu0.25Co0.35Fe2O4 Ferrites and Their Characterizations

Evaluation of spectral, optoelectrical, dielectric, magnetic, and morphological properties of RE3+ (La3+, and Ce3+) and Co2+ co-doped Zn0.75Cu0.25Fe2O4 ferrites

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