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UV-visible absorption spectra of Zn-Cu nanoferrite (ZnxCu1-xFe2O4) synthesized via exploding wire technique (EWT) was analyzed to characterize the optical properties. It was established in our published paper that prepared Zn-Cu nanoferrite (ZCFO) had direct band gap (Eg). With further investigation, we have established that Eg of semiconducting ZC...
Contexts in source publication
Context 1
... is well established that 330 nm of absorption spectrum is allotted to typical absorption band on nanoscale CuFe2O4. When copper ferrite is doped with Zn there is shift of absorption band towards higher wavelength, signifying decline in the value of band gap energy as depicted in Figure 2. Actually, the measure of optical band gap of prepared (ZnxCu1-xFe2O4) nanoferrite represents the essential energy absorbed when electrons in the valence band get excited to conduction band. ...
Context 2
... order to calculate direct band gap of the sample, (αhν) 2 is plotted against hν. The value of Eg is calculated by extrapolating the linear portion of the curve as shown in Figure 2. ZnxCu1-xFe2O4 have direct energy band gap, the value of which decreases from 3.2 to 3.0 eV on increasing the Zn +2 concentration from x=0.4 to x=0.6. ...
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Citations
... Spinel ferrites have diverse utilities in read/ write heads, radio frequency circuits, transformer cores, antenna rods, filters, switching devices etc. [1]. Dielectric and electrical properties of nanoscale Zn-Cu ferrite (ZCFO), as reported in our recent paper, are suitable for microwave based devices like circulators, isolators, phase shifters, gyrators etc. [1][2][3][4]. ...
In this paper, Zinc-Copper ferrite nanoparticles, synthesized via a novel exploding wire technique. The Fe 3+ cation distribution of tetrahedral and octahedral sites of prepared nanoparticles is estimated through intensity analysis of powder X-ray diffraction. The preference of Zn 2+ and Cu 2+ towards tetrahedral and octahedral sub-lattices and their influence on hyperfine magnetic lines are determined through Mössbauer spectroscopy. The cation distributions of Fe 3+ at tetrahedral and octahedral sites of Fe 2 O 3 powder used as precursor for the synthesis of samples are estimated through sextet's areas. The existence of Fe 3+ oxidation state Zn-rich Zn 0.7 Cu 0.3 Fe 2 O 4 and Cu-rich Zn 0.3 Cu 0.7 Fe 2 O 4 nanoparticles is ascertained through Mössbauer and electron spin resonance analysis. The ferroelectric properties are studied through polarization versus electric field analysis. Zero field cooling-field cooling investigation substantiated superparamagnetic behavior and demonstrated the variation of saturation magnetization with respect to Zinc/Copper concentration, as per Neel's and Yafet-Kittel models.
In this paper, we portray the simulation of continuous-wave electron spin resonance (ESR) of magnetic cobalt ferrite nanoparticles (CoFNPs) which were assembled using simple sol–gel auto-combustion synthesis and irradiated with gamma dose up to 100 kGy. An emphasis has been given for estimating the crystallite size (t311) by re-evaluating Debye–Scherrer’s value with the Williamson–Hall extrapolation function (W–H plot) drawn from X-Ray Diffraction (XRD) data. Also, the lattice parameter was re-confirmed via NVs(1/d) plots. The SEM images have supported the nanosize of the CoFNPs and the skewed histogram chart has suggested the average grain distribution range 96.18–123.49 nm ± 10. The topology of the samples was studied by the atomic force microscopy images. In the first derivative peak of ESR spectroscopy, an isotropic value, i.e. gyroscopic spitting factor (Lande’s g-value), and line width (ΔHpp) were used to examine the γ-radiation damage in the investigated CoFNPs samples. The present analysis may help an individual to comprehend the innumerable intra-atomic and molecular constraints affecting the subsequent physical properties of ferrite nanoparticles.
