Materials Science Research Laboratory

Dasūa, India

Materials Science Research Laboratory

Dasūa, India
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Ravichandran K.,Materials Science Research Laboratory | Manivasaham A.,Materials Science Research Laboratory
Journal of Materials Science: Materials in Electronics | Year: 2017

Sn doped ZnO (TZO) thin films were deposited using a homemade nebulizer spray pyrolysis unit on glass substrates. The Sn doping concentration in the starting solution is varied as 2, 4, 6 and 8 at.% and the effect of Sn doping level on the structural, optical, surface morphological and gas sensing properties were investigated. The XRD results reveal that all the films have polycrystalline nature with hexagonal wurtzite structure and the optical studies show that the average transmittance of the deposited films is about 80% in the visible region. All the films show good ammonia gas sensing behavior. Especially, ZnO:Sn film with 6 at.% of Sn doping shows the best response time and recovery time for ammonia gas sensing at room temperature. The AFM results reveal that at 6 at.% of Sn doping, the ZnO film shows maximum roughness and high porosity. © 2017 Springer Science+Business Media New York


Kadam R.H.,Materials Science Research Laboratory | Alone S.T.,Science and Commerce College | Mane M.L.,Rajarshi Shahu Mahavidyalaya | Biradar A.R.,Materials Science Research Laboratory | Shirsath S.E.,Shinshu University
Journal of Magnetism and Magnetic Materials | Year: 2014

Li+ substituted CoFe2O4 with the chemical formula Li3xCoFe2-xO4 were synthesized by sol-gel auto combustion method. The synthesized samples were annealed at 600°C for 4 h. X-ray diffraction data were used to evaluate the structure of the prepared samples. Spinel ferrite phase of CoFe2O4 changes to ordered like lithium ferrite phase with increase in Li+ substitution. Lattice constant increases whereas particle size found to decrease with Li+ substitution. Infrared spectroscopy also confirmed the phase transition of CoFe2O4 after the incorporation of lithium ions. Substitution of Li+ ions for Fe3+ caused a decrease in the saturation magnetization from 69.59 emu/g to 47.71 emu/g and the coercivity increased from 647 Oe to 802 Oe. Resistivity and dielectric properties shows inverse relation to each other. © 2013 Elsevier B.V. All rights reserved.


Shirsath S.E.,Dr. Babasaheb Ambedkar Marathwada University | Toksha B.G.,Dr. Babasaheb Ambedkar Marathwada University | Kadam R.H.,Materials Science Research Laboratory | Patange S.M.,Materials Science Research Laboratory | And 3 more authors.
Journal of Physics and Chemistry of Solids | Year: 2010

The ferrite samples of a chemical formula Ni0.5-xMn xZn0.5Fe2O4 (where x=0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) were synthesized by solgel auto-combustion method. The synthesized samples were annealed at 600 °C for 4 h. An analysis of X-ray diffraction patterns reveals the formation of single phase cubic spinel structure. The lattice parameter increases linearly with increase in Mn content x. An initial increase followed by a subsequent decrease in saturation magnetization with increase in Mn content is observed showing inverse trend of coercivity (Hc). Curie temperature decreases with increase in Mn content x. The initial permeability is observed to increase with increase in Mn content up to x=0.3 followed by a decrease, the maximum value being 362. Possible explanation for the observed structural, magnetic, and changes of permeability behavior with various Mn content are discussed. © 2010 Elsevier Ltd.


Mane D.R.,Balbhim College | Patil S.,Balbhim College | Birajdar D.D.,Balbhim College | Kadam A.B.,Jawahar Mahavidyalaya andoor | And 2 more authors.
Materials Chemistry and Physics | Year: 2011

Li0.5CrxFe2.5-xO4 powders with fine sized particles were successfully synthesized by sol-gel auto combustion, using lithium nitrate, ferric nitrate, chromium nitrate, and citric acid as the starting materials. The process takes only a few minutes to obtain as-prepared Cr-substituted lithium ferrite powders. The resultant powders were annealed at 600 °C for 4 h and investigated by thermogravimeter/differential thermal analyzer (TG/DTA), X-ray diffractometer (XRD) and vibrating sample magnetometer (VSM). Lattice parameter, bulk density and particle size are found to decrease with increasing Cr concentration, whereas X-ray density and porosity showed an increasing trend with the Cr content. Cation distribution indicates that the chromium ion occupy octahedral B-site. The magnetic moments calculated from Neel's molecular field model are in agreement in the experiment result, which indicates that the saturation magnetization decreases linearly from 37.36 to 4.27 emu/g with increasing Cr3+ content. However, coercivity, it increases with the Cr3+ substitution. © 2010 Elsevier B.V. All rights reserved.


Mane D.R.,Materials Science Research Laboratory | Birajdar D.D.,Materials Science Research Laboratory | Shirsath S.E.,Dr. Babasaheb Ambedkar Marathwada University | Telugu R.A.,University of Zagreb | Kadam R.H.,Materials Science Research Laboratory
Physica Status Solidi (A) Applications and Materials Science | Year: 2010

The ferrite samples of Ni 0.7-xMn xZn 0.3Fe 2O 4 (where x=0.0-0.7 in steps of x=0.1) were synthesized by a sol-gel autocombustion method using nitrates of respective metal ions. The synthesized samples were annealed at 600 °C for 4 h. The phase purity of the samples was investigated by X-ray diffraction (XRD). An analysis of XRD patterns reveals the formation of single-phase cubic spinel structure. The crystal lattice constant increases gradually with increasing x from 8.389 to 8.473A°. The cation distribution of constituent ions shows linear dependence of Mn substitution. Based on the cation distribution obtained from XRD data, structural parameters such as lattice parameters, ionic radii of available sites, and the oxygen parameter "u" have been calculated. The trend of theoretically calculated lattice parameter with Mn content matches well with the experimentally obtained values. An initial increase followed by a subsequent decrease of saturation magnetization with increase in x is observed. Possible explanations for the observed structural and magnetic behavior with various Mn content are discussed. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Shirsath S.E.,Vivekanand College | Kadam R.H.,Materials Science Research Laboratory | Patange S.M.,Materials Science Research Laboratory | Mane M.L.,SGRG Shinde Mahavidyalaya | And 2 more authors.
Applied Physics Letters | Year: 2012

Dy 3+ substituted Ni-Cu-Zn (Ni 0.4Cu 0.4Zn 0.2Dy xFe 2-xO 4) ferrite nanoparticles were obtained at 600 °C by synthesizing sol-gel auto-combustion method, and they exhibit a particle size of 12-21 nm. X-ray diffraction patterns confirm the presence of secondary phase of DyFeO 3+ and Fe 2O 3 for the Dy 3 substituted samples. Ni-Cu-Zn ferries doped with Dy 3 possess better grain structure and growth than that of pure Ni-Cu-Zn ferrite. The saturation magnetization increases remarkably up to 81 emu/g with increasing the Dy 3+ ions. The increased saturation magnetization related to increased exchange interactions between Fe-Fe ions and also with increased particle size. Blocking temperature was found to decrease with increasing Dy 3+ substitution. An enhancement in initial permeability and Curie temperature was observed with Dy 3+ substitution. © 2012 American Institute of Physics.


Pawar R.A.,Commerce and Science College | Patange S.M.,Materials Science Research Laboratory | Shirsath S.E.,Vivekanand College
RSC Advances | Year: 2016

Nanoparticles of Ho3+ substituted in Co-Zn ferrites were synthesised by sol-gel method. The phase formation of these samples has been confirmed by X-ray powder diffraction technique. XRD Rietveld refinement carried out using the FULLPROF program shows that the Co-Zn ferrite retains its single phase cubic structure with space group Fd3m for x ≤ 0.05. Occupancy of the cations is explained on the basis of site preference, size and valance of the substitution cations. The nanostructure and morphology of prepared samples were investigated by field emission scanning electron microscopy and transmission electron microscopy. The elemental percentage of the constituent ions was determined using energy dispersive spectroscopy. The magnetic interactions among the nanoparticles were analyzed by employing a temperature dependent vibration sample magnetometer, field cooled (FC)/zero field cooled (ZFC) measurements. The ZFC and FC curves diverge below the blocking temperature exhibiting a ZFC cusp at 195-225 K. The saturation magnetization of Co-Zn ferrite increased linearly with Ho3+ substitution for x ≤ 0.05 and almost remains constant thereafter. The frequency dependence of the AC susceptibility measurements was performed on the sample. It shows a peak at around spin freezing temperature, with the peak position shifting as a function of driving frequency, indicating a spin-glass-like transition of the sample. © The Royal Society of Chemistry 2016.


Shirsath S.E.,Vivekanand College | Shirsath S.E.,Shinshu University | Kadam R.H.,Materials Science Research Laboratory | Mane M.L.,SGRG Shinde Mahavidyalaya | And 4 more authors.
Journal of Alloys and Compounds | Year: 2013

A series of spinel ferrites, Li0.5Co1.5xFe 2.5-xO4, with x = 0.0, 0.25, 0.50, 0.75 and 1.0 were successfully synthesized by sol-gel auto combustion method, aiming to study the relationship between structural and magnetic interactions related to the concentration of the substituted cobalt cations. X-ray diffraction measurements were employed for analyzing the structure, lattice parameter, density, porosity and crystallite size of the prepared samples. Samples have the cubic spinel structure with a small amount of α- Fe2O3 and γ-Fe2O3. As the Co2+ ions increases, hematite and maghemite phases disappear and the crystals form the single phase spinel structure with the cation ordering on octahedral sites. Lattice constant (a) increases from 8.331 to 8.423 A with increase in Co2+ substitution. Particle size estimated from the transmission electron microscopy images, and is ranging from 12 to 23 nm. Infrared spectroscopy measurements were carried out to study the band position and structure of the sample. Saturation magnetization decreased linearly from 41.21 to 28.84 A m2/kg with an increase in Co2+ content. It was found that coercivity increased with the Co2+ substitution from 8678 to 75636 A/m. The samples were zero field cooled to 100 K. Typical blocking effects were observed below about 253 K. Curie temperature (TC) were obtained from AC susceptibility and permeability measurements shows the decreasing trend with Co2+ substitution, indicating the weakening in A-B interactions. Permeability decreased with the increase in Co2+ substitution due to the combine effect of magnetization and magnetocrystalline anisotropy. © 2013 Elsevier B.V. All rights reserved.


Shirsath S.E.,Vivekanand College | Shirsath S.E.,Dr. Babasaheb Ambedkar Marathwada University | Kadam R.H.,Materials Science Research Laboratory | Gaikwad A.S.,Vivekanand College | And 2 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2011

Sintering temperature and particle size dependent structural and magnetic properties of lithium ferrite (Li0.5Fe2.5O4) were synthesized and sintered at four different temperatures ranging from 875 to 1475 K in the step of 200 K. The sample sintered at 875 K was also treated for four different sintering times ranging from 4 to 16 h. Samples sintered at 1475 K have the cubic spinel structure with a small amount of α-Fe 2O3 (hematite) and γ-Fe2O3 (maghemite). The samples sintered at≤1275 K do not show hematite and maghemite phases and the crystals form the single phase spinel structure with the cation ordering on octahedral sites. Particle size of lithium ferrite is in the range of 1345 nm, and is depend on the sintering temperature and sintering time. The saturation magnetization increased from 45 to 76 emu/g and coercivity decreases from 151 to 139 Oe with an increase in particle size. Magnetization temperature curve recorded in ZFC and FC modes in an external magnetic field of 100 Oe. Typical blocking effects are observed below about 244 K. The dielectric constant increases with an increase in sintering temperature and particle size. © 2011 Elsevier B.V. All rights reserved.


Mane D.R.,Belbhim College | Birajdar D.D.,Belbhim College | Patil S.,Belbhim College | Shirsath S.E.,Vivekanand College | Kadam R.H.,Materials Science Research Laboratory
Journal of Sol-Gel Science and Technology | Year: 2011

Cu0.7- x Co x Zn0.3Fe2O 4 (0 ≤ x ≤ 0.5) nanoparticles are prepared by sol-gel auto combustion method, using copper nitrate, zinc nitrate, ferric nitrate, cobalt nitrate, and citric acid as the starting materials. The process takes only a few minutes to obtain as-received Co-substituted Cu-Zn ferrite powders. X-ray diffraction (XRD), vibrational sample magnetometer and thermo gravimetric analysis are utilized in order to study the effect of variation in the Co substitution and its impact on particle size, lattice constant, density, cation distribution and magnetic properties like magnetization, coercivity, remanent magnetization, ferritization temperature and associated water content. Lattice parameter found to increase with increasing Co content, whereas X-ray density, bulk density, particle size showed decreasing trend with the Co content. Cation distribution indicates that the Co and Cu ion show preference towards octahedral [B] site, Zn occupy tetrahedral (A) site whereas Fe occupy both tetrahedral (A) and octahedral [B] site. Redistribution of cations takes place for x > 0.3. Saturation magnetization (Ms) increases from 52.99 to 79.62 emu/g (x ≤ 0.3), for x > 0.3 Ms decreases with increase in Co content x. However, coercivity, magnetocrystalline anisotropy and remanent magnetization increases with the Co2+ substitution. © 2010 Springer Science+Business Media, LLC.

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