Sardar Dalipsingh Commerce and Science College

Aurangābād, India

Sardar Dalipsingh Commerce and Science College

Aurangābād, India
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Humbe A.V.,Dr. Babasaheb Ambedkar Marathwada University | Nawle A.C.,Sardar Dalipsingh Commerce and Science College | Shinde A.B.,Abasaheb Garware College | Jadhav K.M.,Dr. Babasaheb Ambedkar Marathwada University
Journal of Alloys and Compounds | Year: 2017

Copper substituted Ni0.70-xCuxZn0.30Fe2O4 (x = 0.0, 0.10 and 0.20) spinel ferrite nanoparticles were prepared by using sol-gel auto combustion method to understand the influence of copper compositional variation on the structure, morphological, magnetic, and electrical properties of Ni-Zn spinel ferrite. XRD pattern reveals that the samples are crystallized in single phase cubic spinel structure. Using XRD data various structural parameters were obtained. The lattice constant increases with increasing copper content. The particle size obtained by FWHM of most intense peak using Scherer's formula confirms the nanocrystalline nature of the prepared samples. Analysis of SEM images shows the agglomeration of particles with spherical geometry. The elemental compositional details probed by EDS were well matched with that of the calculated composition of each atom. The average particle size estimated using TEM was in the range of 30 nm and 26 nm for NCZ-1 and NCZ-3 respectively. The SAED pattern shows the cubic structure of the NiCuZn spinel ferrites. The Raman spectra auxiliarily confirmed the formation of cubic spinel structure. The magnetic behaviour of all samples was studied at room temperature using pulse field hysteresis loop tracer technique. All the samples exhibit a typical hysteresis loop with increasing saturation magnetization and decreasing coercivity with substitution of copper ions. The magnetic behaviour of these samples was explained on the basis of Neel's collinear model. The DC electrical resistivity measured by two probe technique shows the semiconducting behaviour. The carrier concentration, drift mobility, activation energy were obtained using DC electrical resistivity data and correlated with copper substitution. The experimental data obtained from the various measurements is correlated and influence of copper substitution in Ni-Zn spinel ferrite is discussed in detail. © 2016 Elsevier B.V.


Raut A.V.,Sardar Dalipsingh Commerce and Science College | Jadhav S.A.,Sardar Dalipsingh Commerce and Science College | Shengule D.R.,Sardar Dalipsingh Commerce and Science College | Jadhav K.M.,Dr. Babasaheb Ambedkar Marathwada University
Journal of Alloys and Compounds | Year: 2016

Magnetic nanoparticles of CoFe2O4 NPs were fabricated using simple sol-gel auo-combustion synthesis and irradiated with total gamma dose of 50 kGy and 100 kGy maintaining a dose rate of 0.7 kGy/h. More emphasis was given for calculating an error free value of Lattice constant (α) by re-evaluating Debay-Sherrer value with Nelson-Riley extrapolation function (N-R). Bradley-jay function (B-J) and specimen mis-alignment error was elaborated while discussing the unit cell parameters. SEM images described the irradiation effects on polycrystalline and aggregated morphology of CoFe2O4 NPs. The prominent absorption bands (ν1, ν2, ν3, ν4) in room temperature FTIR spectra confirmed the formation of ferrite phase and stretching vibrations in γ-irradiated CoFe2O4 NPs. Decreasing DC-resistivity, increasing drift mobility and the measured range of activation energy (0.120-0.281 eV) was discussed as a function of γ-irradiation indicating ferrimagnetic behaviour of CoFe2O4 NPs. Several magnetic parameters (Mr, Hc, HK, nBe) were determined from the M-H loop recorded at room temperature. Magnetic anisotropy constant (K1) of gamma irradiated CoFe2O4 NPs was deduced using 'Law of approach' (LA) fit to saturation. © 2016 Elsevier B.V. All rights reserved.


Barkule R.S.,Dr. Babasaheb Ambedkar Marathwada University | Raut A.V.,Dr. Babasaheb Ambedkar Marathwada University | Shengule D.R.,Sardar Dalipsingh Commerce and Science College | Jadhav K.M.,Dr. Babasaheb Ambedkar Marathwada University
Journal of Superconductivity and Novel Magnetism | Year: 2014

Structural and cation distribution studies on Ni1-x Zn x Fe2O4 (with x=0.0, 0.2, 0.4, 0.6, 0.8, and 1.0) ferrite nanoparticles by using X-ray diffraction analysis are reported. In this work the Nickel-Zinc ferrites nanoparticles are synthesized by sol-gel auto combustion using respective metal nitrates and citric acid as fuel for the auto combustion reaction. Formation of ferrite nanoparticles having single-phase spinel structure is evident from the obtained X-ray diffraction patterns. Lattice constant values of the Ni1-x Zn x Fe 2O4 ferrite system are found to increase with increase of zinc substitution x. Broad and intense XRD peaks in the patterns indicate the nanocrystalline nature of the produced ferrite samples. Average particle size calculated from most intense Bragg's reflection (311) using Debye-Scherrer's formula is found to be 30 nm. The particle size is found to decrease with increase in zinc substitution x. Observed X-ray density is found to decrease with increase in zinc substitution x. Bulk density, porosity, and unit cell volume are also calculated from the XRD data. Distribution of metal cations in the spinel structure estimated from X-ray diffraction data show that along with Ni2+ ions most of the Zn2+ ions also occupy the octahedral [B] sites, which are attributed to nanosize dimensions of the ferrite samples. © 2013 Springer Science+Business Media New York.


Raut A.V.,Sardar Dalipsingh Commerce and Science College | Shengule D.R.,Sardar Dalipsingh Commerce and Science College | Jadhav K.M.,Dr. Babasaheb Ambedkar Marathwada University
Materials Research Bulletin | Year: 2015

In this work, the structural and magnetic properties of Co1-xZnxFe2O4 (0.0 ≤ x ≤ 1.0) ferrite nanoparticles were studied before and after gamma irradiation. The as-synthesized samples of Co-Zn ferrite nanoparticles prepared by sol-gel auto-combustion technique were analysed by XRD which suggested the single phase; cubic spinel structure of the material. Crystal defects produced in the spinel lattice were studied before and after Co60 γ-irradiation in a gamma cell with a dose rate of 0.1 Mrad/h in order to report the changes in structural and magnetic properties of the Co-Zn ferrite nanoparticles. The average crystallite size (t), lattice parameter (α) and other structural parameters of gamma-irradiated and un-irradiated Co1-xZnxFe2O4 spinel ferrite system was calculated from XRD data. The morphological characterizations were performed using scanning electron microscopy (SEM). The magnetic properties were measured using pulse field hysteresis loop tracer by applying magnetic field of 1000 Oe, and the analysis of data obtained revealed that the magnetic property such as saturation magnetization (Ms), coecivity (Hc), magneton number (nB) etc. magnetic parameters were increased after irradiation. © 2014 Elsevier Ltd. All rights reserved.


Kale C.M.,Indraraj Arts Commerce and Science College | Aghav P.S.,Sardar Dalipsingh Commerce and Science College | Shengule D.R.,Sardar Dalipsingh Commerce and Science College | Jadhav K.M.,Dr. Babasaheb Ambedkar Marathwada University
Journal of Superconductivity and Novel Magnetism | Year: 2014

Zinc-substituted nickel ferrite (Ni 1-x Zn x Fe 2 O 4 with x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0) nanoparticles were synthesized by solgel auto-combustion technique at low temperature and characterized by using X-ray diffraction, scanning electron microscopy, pulse field hysteresis loop technique, and Mossbauer spectroscopy. X-ray diffraction studies confirmed the formation of single-phase spinel structure of the prepared ferrite samples with average crystallite size of 30 nm, very close to that of the critical size for nanoparticles exhibiting superparamagnetism. Scanning electron micrographs of the ferrite samples showed uniform spherical morphology of nanograins with homogenous microstructure. Further investigations on magnetic properties by pulse field hysteresis loop technique and Mossbauer spectroscopy indicated the presence of superparamagnetic phases in the ferrite samples attributed to occupation of octahedral [B] sites by zinc ions in these Ni-Zn samples and also to the nanometer sizes of the ferrite particles. Magnetic behavior of the Ni-Zn ferrite system is in agreement, initially, with Neel's two-sublattice collinear model and then with the Yafet-Kittel model for samples with higher zinc content (x ≥ 0.4). Value of hyperfine splitting is found to decrease with increase in zinc content and is attributed to the reduction in particle size giving rise to superparamagnetism. Other Mossbauer parameters like quadrupole splitting and the isomer shift are within the reported range for those of ferrites with spinel structure. © 2014 Springer Science+Business Media New York.


Khirade P.P.,Dr. Babasaheb Ambedkar Marathwada University | Birajdar S.D.,Dr. Babasaheb Ambedkar Marathwada University | Raut A.V.,Sardar Dalipsingh Commerce and Science College | Jadhav K.M.,Dr. Babasaheb Ambedkar Marathwada University
Ceramics International | Year: 2016

Iron (Fe) doped barium titanate nanoceramics (BaTi1-xFexO3) were synthesized through sol-gel auto combustion route. The effect of Fe doping on the structural, morphological, ferroelectric and magnetic properties was systematically studied. X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopic measurements showed that the synthesized samples have a tetragonal dominant structure with the presence of intermediate hexagonal phase for higher Fe content (x=0.4 and 0.5). Accurate values of average crystallite size (D) and lattice parameter (a and c) were calculated by the Williamson-Hall (W-H) analysis and Nelson-Riley extrapolation function (N-R) respectively. The calculated average crystallite size (D) of the prepared samples is in the 17-27nm range. The surface morphology of the grains was examined by field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). Compositional stoichiometry was confirmed by energy dispersive spectrum (EDS) analysis. The ferroelectric property was studied by a P-E hysteresis loop. Magnetic and ferroelectric hysteresis loops are strongly influenced by Fe ion doping concentration due to creation of oxygen vacancies. The saturation electric polarization decreases with the increasing of Fe ion doping concentration. The pure BaTiO3 prepared exhibits diamagnetism. Simultaneously, magnetization of doped compositions is enhanced with increasing of Fe ion concentration. Room temperature ferromagnetism is also observed in Fe doped BaTiO3 samples. This anomaly in the magnetic behavior can be explained in terms of the changes in the oxidation state exchange interactions of ions such as the Fe3+ -to-Fe4+ change induced by oxygen vacancies. A divergence was observed in the temperature dependence of the field cooling (FC) and zero-field cooling (ZFC) magnetization curves, indicating a spin-glass behavior arising from micro-magnetic state, i. e. the mixing of ferromagnetic and antiferro-magnetic phases. The ferromagnetic properties are predominant below 50K and increases with the Fe doping concentration. © 2016 Elsevier Ltd and Techna Group S.r.l.


Khirade P.P.,Dr. Babasaheb Ambedkar Marathwada University | Birajdar S.D.,Dr. Babasaheb Ambedkar Marathwada University | Raut A.V.,Sardar Dalipsingh Commerce and Science College | Jadhav K.M.,Dr. Babasaheb Ambedkar Marathwada University
Journal of Electroceramics | Year: 2016

The structural, microstructural, optical, electrical and dielectrical properties of nanocrystalline Fe substituted BaTiO3 synthesized by sol-gel auto combustion have been investigated. The X-ray diffraction (XRD) analysis revealed the existence of the tetragonal phase for lower Fe content (x = 0.0–0.3) whereas, coexistence of the tetragonal and hexagonal structure of higher Fe content (x = 0.4 and 0.5). The lattice constant (a and c) and unit cell volume (V) increases with increase in Fe content; and an average crystallite size (t) was recorded in the range of ~14–20 nm. The surface morphology as examined using field emission scanning electron microscopy (FESEM) and the compositional stoichiometry was confirmed by energy dispersive spectrum (EDS) analysis. The UV-Vis spectra showed that the band gap energy sensitively depends on the Fe concentration x. DC-electrical conductivity (σ) was recorded in the temperature range of 333–714 K which was found to be increases with increasing temperature and Fe concentration; indicating that an electrical conduction was a thermally activated process. The type of temperature dependent DC conductivity indicates that the electrical conduction in the material is a thermally activated process. The dependencies of the conductivity contributions were predicted from the simple defect model presented, in which oxygen vacancies charge compensate Fe substitution of Ti. Dielectrical property was measured as a function of frequency in the range 50 Hz - 5 MHz at room temperature which was found to be higher at lower frequencies. Dielectric constant (ε’) and loss tangent (tan δ) shows strong compositional as well as frequency dependences. © 2016 Springer Science+Business Media New York


Raut A.V.,Sardar Dalipsingh Commerce and Science College | Khirade P.P.,Dr. Babasaheb Ambedkar Marathwada University | Humbe A.,Dr. Babasaheb Ambedkar Marathwada University | Jadhav S.A.,Sardar Dalipsingh Commerce and Science College | Shengule D.R.,Sardar Dalipsingh Commerce and Science College
Journal of Superconductivity and Novel Magnetism | Year: 2016

The work is devoted to the study of structural and frequency-dependent dielectric properties of Ni-Zn ferrite with Al3+ substitution by means of standard double sintering method. Several physical properties of the ferrite powder were characterized after confirmation of single-phase spinel structure. In the present investigation, the lattice constant initially increases from x = 0.0 to 0.2 and then it decreases with Al3+ content. The crystallite size (t = 2.7˜4.2 μm) was estimated from X-ray diffraction studies, and it follows the behaviour of the lattice constant accordingly. The dielectric parameters ε′ and ε″ measured at 1 kHz were found to be greater than those measured at 10 kHz. The analysis of χT/ χRT plots shows the multidomain nature of the prepared Ni0.7Zn0.3AlxFe2−xO4 samples. It was observed that the activation energy is lower in the case of the ferrimagnetic region (Ef), whereas it is higher in the paramagnetic region (EP). The saturation magnetization σs and magneton number nB decrease with increase in Al3+ content. The concluding analysis of the studied Ni0.7Zn0.3AlxFe2−xO4 contributes to ferrite research and may vary its range of application. © 2016 Springer Science+Business Media New York


Raut A.V.,Sardar Dalipsingh Commerce and Science College | Barkule R.S.,Sardar Dalipsingh Commerce and Science College | Shengule D.R.,Sardar Dalipsingh Commerce and Science College | Jadhav K.M.,Dr. Babasaheb Ambedkar Marathwada University
Journal of Magnetism and Magnetic Materials | Year: 2014

Structural morphology and magnetic properties of the Co 1-xZnxFe2O4 (0.0≤x≥1.0) spinel ferrite system synthesized by the sol-gel auto-combustion technique using nitrates of respective metal ions have been studied. The ratio of metal nitrates to citric acid was taken at 1:3. The as prepared powder of cobalt zinc ferrite was sintered at 600 C for 12 h after TG/DTA thermal studies. Compositional stoichiometry was confirmed by energy dispersive analysis of the X-ray (EDAX) technique. Single phase cubic spinel structure of Co-Zn nanoparticles was confirmed by XRD data. The average crystallite size (t), lattice constant (a) and other structural parameters of zinc substituted cobalt ferrite nanoparticles were calculated from XRD followed by SEM and FTIR. It is observed that the sol-gel auto-combustion technique has many advantages for the synthesis of technologically applicable Co-Zn ferrite nanoparticles. The present investigation clearly shows the effect of the synthesis method and possible relation between magnetic properties and microstructure of the prepared samples. Increase in nonmagnetic Zn2+ content in cobalt ferrite nanoparticles is followed by decrease in nB, Ms and other magnetic parameters. Squareness ratio for the Co-ferrite was 1.096 at room temperature. © 2014 Elsevier B.V.


Raut A.V.,Sardar Dalipsingh Commerce and Science College | Jadhav S.A.,Sardar Dalipsingh Commerce and Science College | Shengule D.R.,Sardar Dalipsingh Commerce and Science College | Jadhav K.M.,Dr. Babasaheb Ambedkar Marathwada University
Journal of Sol-Gel Science and Technology | Year: 2016

Abstract: Nanocrystalline spinel ferrite was prepared by sol–gel auto-combustion technique and sintered at 600 °C for 12 h. Single-phase cubic spinel structure of zinc ferrite was confirmed through X-ray diffractometry. Several structural and magnetic properties of ZnFe2O4 NPs were studied after Co60γ-irradiation with total gamma dose of 50 and 100 kGy. An average crystallite size was determined from the full width at half maximum of strongest reflection (311) by using Scherrer’s approximation. Williamson–Hall plot (graph against βcosθ and 4sinθ) was used to re-evaluate the measured crystallite size and to estimate the strain distribution in terms of η%. Lattice constant (α) initially increased slightly to 8.441 Å with γ-50 kGy and then decreased dramatically with total dose of γ-100 kGy. Frustrated behaviour in peak shift to lower and higher 2θ side can be seen in XRD after γ-irradiation to ZnFe2O4 NPs. FT-IR spectra confirmed the formation of ferrite phase and redistribution of cations in (A) and [B] sites of ZnFe2O4 spinel structure. In the first derivative peak of ESR spectroscopy, gyroscopic spitting factor (g-value) and linewidth (∆HPP) were used to deliberate the γ-radiation damage in investigated ferrimagnetic nanoparticles. Experimental results revealed that the saturation magnetization (Ms), coercivity (Hc) and magneton number (nB) of ZnFe2O4 NPs were found to be increased after gamma irradiation dose of γ-100 kGy. Graphical Abstract: [Figure not available: see fulltext.] © 2016 Springer Science+Business Media New York

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