EFFECT OF COPPER INFUSION ON THE BAND GAP OF ZINC FERRITE POLYCRYSTALS (original) (raw)
Related papers
Advances in Nanoparticles, 2018
The samples of Zn 0.5 Cu x Mg 0.5-x Fe 2 O 4 nanoparticle ferrites, with x= 0.0, 0.1, 0.2, 0.3, 0.4 were successfully synthesised. Structural and optical properties were investigated by X-ray Diffraction (XRD), Fourier Transform Infrared spectroscopy (FTIR) and UV-visible spectroscopy. The structural studies showed that all the samples prepared through the Co-precipitation method was a single phase of a face-cantered-Cubic (FCC) spinel symmetry structures with space group (SG): Fd-3m. In the series Zn 0.5 Cu x Mg 0.5-x Fe 2 O 4 , the lattice parameter was found to be 8.382 Å for x = 0 and was found to increase with copper concentration. The grain size obtained from the XRD data analyses was found to be in the range of 15.97 to 28.33 nm. The increased in the grain size may be due to the large ionic radius of Mg 2+ (0.86 Å) compared with Cu 2+ (0.73 Å). The FTIR spectroscopy confirmed the formation of spinel ferrite and showed the characteristics absorption bands around 580, 1112, 1382, 1682, 1632 and 2920 cm −1. The energy band gap was calculated for samples were found to be in the range 4.04 to 4.67 eV.
2017
Zinc ferrite nanoparticles have been synthesized by using the sol-gel method from Fe(NO 3) 3 .9H 2 O and Zn(NO 3) 2 .6H 2 O by adopting molecular concentrations (0.2 M and 0.4 M) .The samples were sintered at two temperatures (600 °C , 800°C) for two hours. The spinal phase of zinc ferrite structure and crystallite size was examined by XRD spectrum, pattern show that nanoparticles structure exhibit mixed phase of-Fe 2 O 3 and ZnFe 2 O 4. On the optical properties for all the films were studied by recording the transmittance and absorbance spectra in the range of (200-1000) nm. The results showed that the energy band gap for allowed direct electronic transition varies from (2.63 to 2.97)eV at sintering temperature 600 °C and concentration of 0.2 M,(2.32 to 2.70)eV at sintering tempeature 800 °C and concentration of 0.4 M.
Advances in Nanoparticles
The Zn 0.5 Cu x Mg 0.5−x Fe 2 O 4 (where x = 0.0, 0.1, 0.2, 0.3 and 0.4) was prepared by sol-gel route and characterized in detail in terms of their structural, morphological, elemental and optical properties as a function of Cu concentration. X-ray diffractometer (XRD) results confirmed the formation of cubic spinel-type structure with average crystallized size in the range of 30.56 to 40.58 nm. Lattice parameter was found to decrease with Cu concentration due to the smaller ionic radius of Cu 2+ ion. The HR-SEM images show morphology of the samples as prismatic shaped particles in agglomeration. The elemental dispersive X-ray Spectroscopy (EDX) confirmed the elemental composition of the as-prepared spinel ferrite material with respect to the initial concentration of the synthetic composition used for the material. The Fourier transform infrared (FTIR) spectroscopy confirmed the formation of spinel ferrite and showed the characteristics absorption bands around 463, 618, 876, 1116, 1442, 1622 and 2911 cm −1. The energy band gap was calculated for the samples were found to be in the range of 4.87 to 5.30 eV.
Transport Properties of Polycrystalline Mixed Copper-Zinc Ferrites
Materials Research, 2018
Polycrystalline mixed Cu-Zn spinel ferrites with general formula Cu 1-x Zn x Fe 2 O 4 (x = 0.0, 0.1, 0.3, 0.5 and 0.7) have been prepared by solid-state reaction method. The effect of Zn 2+ ions on transport properties such as DC and AC resistivity, dielectric constant and dielectric loss tangent has been presented in this paper. The resistivity increases with Zn content and decreases with frequency which have been explained by Verway's hopping mechanism. Decrease of DC electrical resistivity with increasing temperature has been observed and activation energy has been found to increase with increasing Zn content. The dielectric constant is found to decrease with increasing Zn content as well as increasing of frequency has been explained on the basis of space charge polarization. In this communication, an attempt has been made to explain the conduction mechanism of Cu-Zn ferrites on the basis of electronic hopping frequency between Fe 2+ and Fe 3+ ions.
Materials Science-Poland
We have synthesized zinc-copper ferrite (ZCFO) employing exploding wire technique (EWT). The X-ray diffraction (XRD) data confirm the formation of single phase spinel ZCFO, which is in good agreement with Fourier transform infrared spectroscopy (FT-IR), UV-Vis, and Raman spectroscopic analyses. It is also clearly seen in the SEM micrographs that the grains in ZCFO ferrite are very rough, which allows adsorption of gas like oxygen and therefore, the material can behave as active sensing surface. The size range of the grains in prepared sample is of 200 nm to 500 nm. The FT-IR spectrum of the nanocomposite consists of two broad bands, one at 580.4 cm−1 due to M–O stretching mode at the tetrahedral site and the other at 400.7 cm−1 due to M–O stretching mode at the octahedral site. The nanoparticles show a UV-Vis absorption band in the wavelength region of 400 nm to 700 nm. The energy band gap for the prepared nanomaterial was estimated to be 3.16 eV. Thus, the ferrite nanocomposite pre...
IRJET, 2022
Zinc ferrite nano fillers are synthesized via way of means of the usage of chemical precipitation technique. The length of the synthesized nanoparticles is decided from XRD result. The virgin and nano sized zinc ferrite doped PVA composite films had been organized via way of means of solvent casting technique. The organized polymer nanocomposite become characterised via way of means of XRD, UV-Vis and Electrical conductivity measurements. From XRD outcomes it's far discovered that the semicrystalline polymer get becomes crystalline shape upon doping. Using the discovered UV-Vis examine Molar extinction coefficient, dipole moment, dipole power, dipole duration and oscillator power had been expected via way of means of adopting fashionable technique and version of those parameters with doping stage are attributed to adjustments withinside the orientation of the crystallites in the composite. The optical power band hole and activation power had been additionally calculated the usage of absorption spectra and it's far discovered that the optical band hole decreases and activation power will increase with filler concentration. The lower withinside the band hole and advent of latest dipoles complements the electric conductivity of the composite films. The most conductivity of 6.52571×10-5 S/cm is completed for 2 wt% dopant concentration.
Journal of Advanced Dielectrics
Polycrystalline NiCuZn ferrite (NixCu[Formula: see text]Zn[Formula: see text]Fe2O4; [Formula: see text], 0.3, 0.4 and 0.5) were prepared through sol–gel auto combustion method applying double sintering technique. Structural, morphological, elemental analyses (EDS), Fourier-transform infrared spectroscopy (FTIR), Direct Current (DC) electrical resistivity, dielectric, magnetic and optical properties of prepared samples were analyzed. XRD profiles reveal the formation of simple cubic spinel structure without any traceable impurity. The average crystallite size lies within the range of 22–29[Formula: see text]nm. Lattice parameter decreases with increasing Ni concentration. Room temperature DC resistivity was recorded from [Formula: see text] to [Formula: see text][Formula: see text][Formula: see text][Formula: see text]cm. Both dielectric constant ([Formula: see text]) and loss factor (tan[Formula: see text]) were decreased with increase of frequency while AC conductivity increases. F...
2018
Magnetic spinel ferrites are important materials owing to their outstanding electrical and magnetic properties. Their distinctive qualities such as high electrical resistivity, high permeability and negligible eddy current losses for high-frequency electromagnetic wave propagation make them suitable for many technological applications. In this study, ZnFe2O4 and Zn0.9Cu0.05Mg0.05Fe2O4 nanoferrite materials were synthesized by sol-gel combustion method. The effect of Cu2+and Mg2+ for Zn2+ substitution on thermal structural, optical, electrical and dielectric properties of ZnFe2O4 were investigated using thermogravimetric analysis (TGA), differential thermal analysis (DTA), x-ray powder diffraction (XRD),Ultra violet visible (UV-Vis) spectroscopy, Fourier-transform infrared (FT-IR) spectroscopy and Impedance spectroscopy (IS). From TGA/DTA analysis, compound formation, temperatures as well as the weight loss regions were identified. The XRD results confirmed that all XRD peaks appeare...