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journal of Rare Earths 2018年第4期36卷 390-397页

作者： S.R.Bhongale H.R.Ingawale t.j.shinde P.N.Vasambekar Department of Physics Yashavantrao Chavan Institute of Science Department of Physics B.V.M.B.S.K.Kanya Mahvidyalaya Department of Physics K.R.P.Kanya Mahvidyalaya Department of Electronics Shivaji University

Nd3＋ substituted spinel ferrites with formula MgxCd1-xNd0.03Fe1.97O4（x = 0.0.2,0.4,0.***.0.8 and 1.0）were prepared by oxalate co-precipitation method using novel microwave sintering technique. AR grade sulphates were used as starting chemicals. the samples were sintered at optimized power of 70 W for10 min in a microwave oven（800 W）. the structural analysis of these samples was done by using X-ray diffraction, scanning electron microscope and Fourier transform IR techniques. the XRD analysis of the synthesized ferrite confirms the formation of cubic spinel structure of ferrite. the influence of Nd3＋substitution on various structural parameters of Mg-Cd ferrites was reported. IR study indicates the spectra contain two intense absorption bands around 600 and 400 cm^（-1） in addition with four extra bands. the magnetic properties of all ferrites were studied by using a vibration sample *** crystallite and grain size dependant magnetic properties are observed. the composition Mg_（0.6）Cd_（0.4）Nd_（0.03）Fe_（1.97）O_4 has better magnetic properties that can be used in recording media. the fast synthesis of spinel ferrites is yielded due to use of the microwave sintering technique.

关键词： Mg-Nd-Cd ferrite Rare earth Microwave sintering IR study Coercive force

Impact of La^(3+)substitution on electrical,magnetic,dielectric and optical properties of Ni_(0.7)Cu_(0.1)Zn_(0.2)LaxFe_(2-x)O_(4)(0tem

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journal of Rare Earths 2023年第5期41卷 740-746,I0004页

作者： B.B.Patil A.D.Pawar S.S.Barate j.S.Ghodake j.B.thorat t.j.shinde P.G.Department of Physics Smt.KRP Kanya MahavidyalayaIslampurMS415409India Department of Physics Shivaji UniversityKolhapurMS416004India Departments of Physics PDVP MahavidyalayaMahavidyalayaTasgaonMS416312India Department of Physics Sadguru Gadage Maharaj CollegeKaradMS415110

the oxalate co-precipitation method was used to synthesize the La3+substituted Ni-Cu-Zn(La-NCZ)nanoferrites having chemical composition Ni_(0.7)Cu_(0.1)Zn_(0.2)LaxFe_(2-x)O_(4)(x=0.015,0.025 and 0.035).DC resistivity study of nanoferrites shows both the conducting and semiconducting *** room temperature DC electrical resistivity of Ni-Cu-Zn(NCZ)nanoferrites decreases,whereas Curie temperature increases with increasing La^(3+)*** the temperature range of 30-170℃nanoferrites show p-type semiconducting behavior except x=0.015;thereafter,they show n-type *** frequency dispersive initial permeability(μi)associated with its real and imaginary(μ’andμ")parts are attributed to the domain wall movement and magnetic spin ***μi,u’andμ"of La-NCZ nanoferrites are higher than those of pure NCZ *** constant(ε’),dielectric loss(ε")and AC resistivity(ρAC)of La-NCZ nanoferrites show normal dielectric *** is found thatε’of NCZ nanoferrites decreases with the increasing content of La3+*** bandgap energy of La-NCZ nanoferrites is achieved in the range 1.36-1.70 eV confirming the semiconducting nature of materials.

关键词： Ni-Cu-La-Zn nanoferrites DC electrical Resistivity Permeability Dielectric properties Bandgap energy Rare earths

Combustion synthesis of Ce^(3+), Eu^(3+) and Dy^(3+) activated NaCaPO_4 phosphors

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journal of Rare Earths 2011年第6期29卷 527-535页

作者： K N shinde S j Dhoble Animesh Kumar Department of Physics RTM Nagpur University National Environmental Engineering Research Institute

the preparation of NaCaPO4 doped with rare earth （RE） ions Ce3＋, Eu3＋ and Dy3＋ by combustion method was described. Under UV excitation （251 nm） of NaCaPO4：Ce3＋ showsd emission （367 nm） in UV range. When NaCaPO4：Dy3＋ phosphor was excited at 349 nm, the emission spectrum showed intense bands at 482 nm （blue） and 576 nm （yellow）. In Eu activated NaCaPO4 phosphor, the emission spectrum showed a dominant peak at 594 nm （orange） while others were at 614 and 621 nm （red） when excited at 393 nm. the prepared phosphor was characterized by X-ray diffraction （XRD）, scanning electron microscope （SEM） and photoluminescence （PL） measurement. thus, the photoluminescence behavior of NaCaPO4：Ce3＋ was strongly suggested for scintillator. Likewise, Eu3＋ and Dy3＋ activated NaCaPO4 phosphors were recommended for near-UV white light-emitting diodes （LEDs）.

关键词： combustion synthesis photoluminescence phosphor scintillator solid state lighting rare earths

Modelling of nanostructured tiO_2-based memristors

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journal of Semiconductors 2015年第3期36卷 52-54页

作者： S.S.shinde t.D.Dongle Shivaji University Korea Research Institute of Standards and Science

the fourth fundamental circuit element memristor completes the missing link between charge and mag- netic flux. It consists of the function of the resistor as well as memory in nonlinear fashion. the property of the memristor depends on the magnitude and direction of applied potential. this unique property makes it the primi- tive building block for many applications such as resistive memories, soft computing, neuromorphic systems and chaotic circuits etc. In this paper we report tiO2-based nanostructured memristor modelling. the present memris- tor model is constructed in MAtLAB environment with consideration of the linear drift model of memristor. the result obtained from the linear drift model is well matched with earlier reported results by other research groups.

关键词： memristor linear drift model tiO2

CFD-DEM analysis of particle polydispersity on the performance of fluidised bed reactor during silane pyrolysis Author links open overlay panel

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Particuology 2024年第8期91卷 72-87页

作者： Akshayveer Vijay M.shinde MS2Discovery Interdisciplinary Research Institute Wilfrid Laurier UniversityWaterlooOntarioN2L3C5Canada Department of Chemical Engineering Indian Institute of Technology(BHU)Varanasi221005India

A CFD-DEM model is developed for chemical vapour deposition of silane in a fluidized bed reactor to investigate the effect of polydispersity on local phase dynamics,mass and heat transport,as well as the rate of Si *** gas-phase fines formation and heterogeneous deposition on the seed particle,as well as the scavenging effect for Si particle growth,are *** method is first validated against the experimentally measured Si deposition rate,percentage of fine production and minimum fluidisation ***,the properties,primarily particle intermixing,fluidisation behaviour and bubble dynamics along with the deposition process,are analyzed for several polydisperse beds under various operating *** effect of polydispersity of the bed on a fraction of the bubble size,dense phase expansion and interchange coefficient between various phases is thoroughly investigated to establish a correlation with reactor *** results show that broad-Gaussian particle size distribution(PSD)exhibits excellent improvement in fluidisation behaviour,resulting in a high deposition rate,and minimum formation of Si fines.

关键词： CFD-DEM method Chemical vapour deposition(CVD) Particle size distribution Silicon Gas-solid fluidized bed

Spin synthesis of monolayer of SiO_2 thin films

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journal of Semiconductors 2015年第4期36卷 16-25页

作者： S.S.shinde S.Park j.Shin Korea Research Institute of Standards and Science

the highly ordered monolayer of submicron size silica （SiO2） particles （235 nm） is developed on p-silicon by using three-step spin-coating in colloidal suspension, which has significant potential in various applications. the influence of three-step spin speeds, spinning time, acceleration time between different steps, concentration of SiO2 particles in the solution, solution quantity, and the ambient humidity （relative humidity） on the properties ofmonolayer SiO2 are studied in order to achieve a large area monolayer film. A relatively high surface coverage and uniform monolayer film of SiO2 particles in the range of 85%-90% are achieved by appropriate control of the preparative parameters. We conclude that this method can be useful in industrial applications, because of the fabrication speed, surface coverage and cost of the process.

关键词： thin films spin synthesis electron microscopy

Effect of Synthesis Method on Photoluminescence Properties of Na_2Sr_2Al_2PO_4Cl_9:Ce^(3+) Nanophosphor

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Nano-Micro Letters 2012年第2期4卷 78-82页

作者： K.N.shinde S.j.Dhoble K.Park N. S. Science and Arts College Department of Physics RTM Nagpur university Faculty of Nanotechnology and Advanced Materials Engineering Sejong University

We have synthesized a series of single-composition emission Na_2Sr_2Al_2PO_4Cl_9:Ce^(3+) phosphor by traditional solid state reactions and novel combustion method. Formation of compound was confirmed by X-ray diffraction analysis. the photoluminescence(PL) emission spectra were observed at 376 nm when excited around 322 nm for the various concentrations in both cases. the PL emission spectra of phosphors showed strong Ce^(3+)emission due to the 5d → 4f transition of Ce^(3+)ions. the Ce^(3+)emission intensity in Na_2Sr_2Al_2PO_4Cl_9:Ce^(3+) prepared by combustion was higher than that of solid state reactions.

关键词： Nanophosphor Luminescence Halophosphate

Structural,morphological,optical and photoluminescent properties of spray-deposited ZnSe thin film

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journal of Semiconductors 2014年第11期35卷 5-9页

作者： G.M.Lohar S.K.shinde V.j.Fulari Holography and Material Research Laboratory Department of PhysicsShivaji University

ZnSe thin films are successfully deposited by spray pyrolysis deposition technique. Deposited thin films are characterized by X-ray diffraction study, and it reveals that spray-deposited ZnSe thin films are polycrystalline with hexagonal crystal structure. Surface morphology is carried out by scanning electron microscopy. It shows cotton-like morphology, and optical properties, such as absorbance, transmittance, reflectance, band gap, refrac- tive index, extinction coefficient are studied. Photoluminescence shows strong emission at 497 nm. Also, spray- deposited ZnSe thin films are hydrophilic in nature, which is shown by contact angle meter.

关键词： spray pyrolysis technique photoluminescence hydrophilicity ZnSe

Vertically aligned NiS nano-flakes derived from hydrothermally prepared Ni(OH)2 for high performance supercapacitor

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journal of Energy Chemistry 2018年第3期27卷 791-800页

作者： A.M.Patil A.C.Lokhande P.A.shinde j.H.Kim C.D.Lokhande thin Film Physics Laboratory Department of PhysicsSbivaji UniversityKolbapar 416004 MHIndia Department of Materials Science and Engineering Chonnam National University 300 Yongbong-DongPuk-GuGwangju.South Korea Centre for Interdisciplinaly Research D.Y.Patil UniversityKolhapurIndia

In present work,the vertically aligned Ni S nano-flakes composed thin film is prepared by anionic exchange process in which hydrothermally prepared Ni（OH）2is used as a parent thin film and Na2S as a sulfide ion *** synthesis process produced fully transformed and shape-controlled nano-flakes of Ni S from nano-flowers of Ni（OH）*** electrochemical supercapacitor properties of Ni S electrode are studied with cyclic voltammetry（CV）,galvonostatic charge discharge（GCD）and electrochemical impedance spectroscopy（EIS）*** porous surface area（85 m^2/g）of Ni S nano-flakes makes large material contribution in electrochemical reaction stretching specific capacitance（Cs）of 880 F/g at scan rate of 5 m V/s and 90%electrochemical stability up to 4000 CV cycles in 2 M KOH ***,the flexible solid-state symmetric supercapacitor device（Ni S/PVA–Li ClO4/Ni S）has been fabricated using Ni S electrodes with polyvinyl alcohol（PVA）–lithium perchlorate（Li ClO4）gel *** Ni S/PVA–Li ClO4/Ni S device exhibits specific capacitance of 56 F/g with specific energy of 14.98 Wh/kg and excellent cycling stability after 2000 *** addition,the Ni S/PVA–Li ClO4/Ni S device demonstrates illumination of red light emitting diode（LED）for 60 s,which confirms the practical applicability of Ni S/PVA–Li ClO4/Ni S device in energy storage.

关键词： Anionic exchange process Nickel sulfide Nano-flakes Supercapacitor thin film

Photoelectrocatrocatalytic hydrolysis of starch by using sprayed ZnO thin films

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journal of Semiconductors 2013年第5期34卷 13-15页

作者： R.t.Sapkal S.S.shinde K.Y.Rajpure C.H.Bhosale Electrochemical Materials Laboratory Department of PhysicsShivaji UniversityKolhapur-416004India

： thin films of zinc oxide have been deposited onto glass/FtO substrates at optimized 400 ℃ by using a chemical spray pyrolysis technique. Deposited films are characterized for their structural, morphological optical and photocatalytic activity by using XRD, an SEM, a UV-vis spectrophotometer, and a PEC single-cell reactor. Films are polycrystalline and have a hexagonal （wurtzite） crystal structure with c-axis （002） orientation growth perpendicular to the substrate surface. the observed direct band gap is about 3.22 eV for typical films prepared at 400 ℃. the photocatalytic activity of starch with a ZnO photocatalyst has been studied by using a novel photoelectrocatalytic process.

关键词： photoelectrocatalysis hydrolysis starch DNSA