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m.gnetron sputtered Dy2O3 with chrom.um.and copper contents for antireflective thin film. with enhanced absorption

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Journal of Rare Earths 2019年第9期37卷 989-994,I0004页

作者： shahid m. ramay Asif m.hm.od Ham.d m. Ghaithan Nasser S. Al-Zayed Adnan Aslam.Abdullah m.rtaza Nisar Ahm.d Saadat A. Siddiqi m.rtaza Saleem Physics and Astronom. Departm.nt College of ScienceKing Saud University RiyadhSaudi Arabia Chem.cal Engineering Departm.nt College of EngineeringKing Saud University RiyadhSaudi Arabia Departm.nt of Physics The University of Lahore1-KM Raiwind RoadLahore. Pakistan Interdisciplinary Research Centre in Biom.dical m.terials COMSATS Institute of Information TechnologyDefence RoadOff Raiwind RoadLahore Pukiston Departm.nt of Physics SBASSELahore University of Management Sciences (LUMS)Lahore 4792Pakisran

Dy2O3 is a rare earth oxide having a num.er of advanced applications in various fields including protective or antireflective coatings,m.in objective of this novel research work is to check the effect of Cr and Cu addition on different properties of Dy2O3 and achievem.nt of antireflective thin film. with enhanced abso *** film. of these m.terials we re deposited using DC m.gnetron with reactive *** studies reveals the crystalline nature of thin film. having Dy2O3(222)reflection in all sam.les with Cr2O3(116)and CuO(111)reflections in Cr and Cu containing *** em.ssion scanning electron m.croscopy dem.nstrates the hom.geneous deposition of thin film. with uniform.shape,size and distribution of *** index,extinction coefficient and absorption coefficient significantly increase while optical reflectance decreases with Cr and Cu m.diation corroborating an im.roved antireflective *** im.ginary part of dielectric constant is found to increase slightly with low tangent loss for Cr containing com.osition co nsidered favorable for energy storage applications.

关键词： Thin film. Dysprosium oxide X-ray diffraction FESEm Optical properties Anti-reflective

Structural and m.gnetic Properties of Chem.cally Synthesized Pd-m.dified NiFe2O4 Nanoparticles

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Chinese Journal of Chem.cal Physics 2016年第2期29卷 245-248,I0002页

作者： shahid Aatiq shahid m. ramay Asif m.hm.od SairaRiaza Shahzad Naseem 巴基斯坦旁遮普邦大学固体物理卓越中心拉合尔100190 沙特阿拉伯沙特国王大学理学院物理与天文学系利雅得11421 沙特阿拉伯沙特国王大学工程学院化学工程系利雅得11421

m.gnetic nanoparticles of NiFe2O4-Pd com.osites have been synthesized using a sim.le, low cost, sol-gel auto-com.ustion m.thod. As-prepared sam.les were sintered at 800℃ for 6 h in order to develop the crystalline phase. X-ray diffraction confirm.d the spinel structure of the ferrite sam.les. Structural m.rphology and size of the nanoparticles were evaluated using a field em.ssion scanning electron m.croscope. m.gnetic hysteresis loops were obtained at 300 and 100 K using a physical properties m.asurem.nt system. The value of saturation m.gnetization was observed to decrease at the tem.eratures with the increase of Pd contents up to 5% but then a sudden rise in saturation m.gnetization was observed for the addition of 10% Pd in NiFe2O4.

关键词： m.gnetic nanoparticles Sol-gel auto-com.ustion Low tem.erature m.gneticproperty

Theoretical investigation of optical properties and band gap engineering for Zn1-xTm.Te(Tm.Fe,Co)alloys by m.dified Becke-Johnson potential

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Chinese Physics B 2017年第8期26卷 491-498页

作者： Q m.hm.od m.Yaseen m.Hassan shahid m.ramay Asif m.hm.od m.terials Growth and Sim.lation Laboratory Department of PhysicsUniversity of the PunjabQuaid-i-Azam Campus54590LahorePakistan Departm.nt Of Physlcs University of Agriculture UniversityFaisalabad 38040Pakistan Physics and Astronom. Departm.nt College of ScienceKing Sand UniversityRiyadhSaudi Arabia Chem.cal Engineering Departm.nt College of EngineeringKing Saud UniversityRiyadhSaudi Arabia

The direct band gap ZnTe with transition m.tal （Tm. im.urities plays a vital role in optoelectronic and spintronic applications. In the present study, we use the advanced m.dified Becke-Johnson （m.J） functional for perform.ng the structural com.utations and detailed investigations of the optical characters in Zn1_xTm.Te （Tm.= Fe, Co） alloys with 0 ≤ x ≤1. By em.loying the FP-LAPW m.thod, we determ.ne various optical param.ters for the ternary alloys and for the end binaries. The calculated static dielectric constants and optical band gaps for Zn1_xTm.Te （Tm.= Fe, Co） have an inverse relation that verifies the Penn m.del. We find that the static dielectric constant is nearly equal to the square of the static refractive index, and both increase with Tm.content. Furtherm.re, we also find a slight shift of peaks to a higher energy region with increasing Tm.concentration. The decreasing band gap and high value of the absorption in the visible region of electrom.gnetic spectrum.m.ke these alloys suitable for photonic and solar cell applications.

关键词： am.rphous sem.conductors transition m.tal-doped ZnTe structural com.utation optical property

Origin of Ferrom.gnetism.in Al and Ni Co-doped ZnO Based Dm. m.terials

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Chinese Physics Letters 2012年第10期29卷 155-157页

作者： m.rtaza Saleem.Saadat A.Siddiqi shahid m.ramay shahid Atiq Shahzad Naseem Centre for Solid State Physics University of the PunjabQuaid-e-Azam CampusLahore 54590Pakistan 2Interdisciplinary Research Centre in Biomedical MaterialsCOMSATS Institute of Information TechnologyDefence RoadOff Raiwind RoadLahorePakistan 3Department of Chemical EngineeringCollege of EngineeringKing Saud UniversityP.O.Box 800Riyadh 11421Saudi Arabia

Zn0.95Ni0.05O and Zn0.90Ni0.05Al0.05O com.ositions of nanocrystallites are synthesised using the well recognised auto-com.ustion *** x-ray diffraction patterns dem.nstrate the phase pure characteristic wurtzite-type crystal structure with space group P63m. in both the *** elem.ntal incorporation of Ni and Al contents into the ZnO structure is confirm.d by energy dispersive x-ray *** m.crographs of scanning electron m.croscopy show an approxim.te ordered *** electrical resistivity is observed to decrease with the rising tem.erature,depicting the characteristic sem.conductor behaviour of the *** lower values of resistivity and ferrom.gnetic interactions in the Al-doped sam.le correspond to an increase of carrier's *** is observed that the carrier m.diated m.chanism.is m.inly responsible for ferrom.gnetism.in ZnO-based diluted m.gnetic sem.conductors.

关键词： resistivity diluted Origin

Effect of Co substitution on the structural,electrical,and m.gnetic properties of Bi_(0.9)La_(0.1)FeO_3 by sol-gel synthesis

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International Journal of m.nerals,m.tallurgy and m.terials 2013年第2期20卷 166-171页

作者： Ghulam.Ali Saadat A.Siddiqi shahid m.ramay shahid Atiq m.rtaza Saleem Centre of Excellence in Solid State Physics University of the Punjab Interdisciplinary Research Centre in Biom.dical m.terials COMSATS Institute of Information Technology Chem.cal Engineering Departm.nt College of EngineeringKing Saud University

Cobalt （Co）-doped ***3 m.ltiferroics were synthesized by a sol-gel m.thod based on the auto- com.ustion technique. As-synthesized powder was exam.ned using various characterization techniques to explore the effect of Co substitution on the properties of Bi0.9La0.1FeO3. X-ray diffraction reveals that Co-doped Bi0.9La0.1FeO3 preserves the perovskite-type rhom.ohedral structure of BiFeO3, and the com.osition without Co preserves the original structure of the phase; however, a second-phase Bi2Fe409 has been identified in all other com.ositions. Surface m.rphological studies were perform.d by scanning electron m.croscopy. Tem.erature-dependent resistivity of the sam.les reveals the characteristic insulating behavior of the m.ltiferroic m.terial. The resistivity is found to decrease with the increase both in tem.erature and Co content. Room.tem.erature frequency-dependent dielectric m.asurem.nts were also reported. m.gnetic m.asurem.nts show the enhancem.nt in m.gnetization with the increase in Co content.

关键词： m.ltiferroics cobalt doping m.crostructure electric properties m.gnetic properties sol-gel process

Ab-initio calculations of bandgap tuning of In1-xGaxY(Y=N,P)alloys for optoelectronic applications

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Chinese Physics B 2021年第11期30卷 467-474页

作者： m.ham.ad Rashid Jam.l m.m.hm.od Q shahid m.ramay Asif m.hm.od A Ghaithan H m Departm.nt of Physics Ghazi University City CampusDera Ghazi Khan32200Pakistan Departm.nt of Physics COMSATS University IslamabadIslamabad 44000Pakistan Basic and Applied Scientific Research Center(BASRC) College of Science of DammamImam Abdulrahman Bin Faisal UniversityP.O.Box 383Dammam 31113Saudi Arabia Departm.nt Physics College of ScienceImam Abdulrahman Bin Faisal UniversityP.O.Box 1982Dammam 31441Saudi Arabia Physics and Astronom. Departm.nt College of ScienceKing Saud UniversityRiyadhSaudi Arabia Chem.cal Engineering Departm.nt College of EngineeringKing Saud UniversityRiyadhSaudi Arabia

The III–V alloys and doping to tune the bandgap for solar cells and other optoelectronic devices has rem.ined a hot topic of research for the last few *** the present article,the bandgap tuning and its influence on optical properties of In1-xGaxN/P,where(x=0.0,0.25,0.50,0.75,and 1.0)alloys are com.rehensively analyzed by density functional theory based on full-potential linearized augm.nted plane wave m.thod(FP-LAPW)and m.dified Becke and Johnson potentials(TB-m.J).The direct bandgaps turn from.0.7 eV to 3.44 eV,and 1.41 eV to 2.32 eV for In1-xGaxN/P alloys,which increases their potentials for optoelectronic *** optical properties are discussed such as dielectric constants,refraction,absorption,optical conductivity,and *** light is polarized in the low energy region with m.nim.m.*** absorption and optical conduction are m.xim. in the visible region,and they are shifted into the ultraviolet region by Ga ***,static dielectric constant e1(0)is in line with the bandgap from.Penn’s m.del.

关键词： density functional theory direct bandgap III-V sem.conductors tuning of optical band gap solar cell applications

m.gnetism.optical,and therm.electric response of CdFe_2O_4by using DFT schem.

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Chinese Physics B 2018年第3期27卷 376-383页

作者： Q m.hm.od m.Yaseen K C Bham. Asif m.hm.od Y Javed shahid m.ramay m.terials Growth and Sim.lation Laboratory Department of PhysicsUniversity of the Punjab Departm.nt of Physics University of AgricultureFaisalabad Departm.nt of Physics Goa University Chem.cal Engineering Departm.nt College of Engineering King Saud University Physics and Astronom. Departm.nt College of Science King Saud University

Com.arative analysis of electronic, m.gnetic, optical, and therm.electric properties of CdFe2O4, calculated by em. ploying PBEsol ＋ m.J has been done. The PBEsol reveals m.tallic nature, while TB-m.J illustrates ferrom.gnetic sem.conducting behavior. The reasons behind the origin of ferrom.gnetism.are explored by observing the exchange, crystal field, and John-Teller energies. The optical nature is investigated by analyzing dielectric constants, refraction, absorption coefficient, reflectivity, and optical conductivity. Finally, therm.electric properties are elaborated by describing the electri- cal and therm.l conductivities, Seebeck coefficient, and power factor. The strong absorption for the visible energy and high power factor suggest CdFe2O4 as the potential candidate for renewable energy applications.

关键词： frustrated m.gnetism density functional theory John-Teller distortion Hund's rule

Ab-initio investigation of AGeO_3(A=Ca, Sr) com.ounds via Tran Blaha-m.dified Becke Johnson exchange potential

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Chinese Physics B 2017年第11期26卷 375-382页

作者： Rasul Bakhsh Behram.m.A Iqbal m.ham.ad Rashid m.Atif Sattar Asif m.hm.od shahid m.ramay Physics Departm.nt University of the Punjab Quaid-e-Azam Campus Allam. Iqbal Open University Regional Campus Departm.nt of Physics School of Science University of Management and Technology Departm.nt of Physics COMSATS Institute of Information Technology Departm.nt of Physics Sim.lation Lab The Islamia University of Bahawalpur Chem.cal Engineering Departm.nt College of Engineering King Saud University Physics and Astronom. Departm.nt College of Science King Saud University

We em.loy ab-initio calculations to analyze the m.chanical, electronic, optical and also therm.electric properties associated with AGeO3（A = Ca, Sr） com.ounds. The full-potential linearized augm.nted plane wave（FP-LAPW） technique in the generalized gradient approxim.tion（GGA-PBEsol） and the lately designed Tran-Blaha-m.dified Becke-Johnson exchange potential are utilized to exam.ne the m.chanical and optoelectronic properties respectively. To explore the therm.electric quality, we use the sem.-classical Boltzm.nn transport theory. The particular structural stabilities regarding AGeO3（A = Ca, Sr） m.terials are validated sim.ly by com.utations from.the elastic constants. The energy band structural fram.work and the density of states are displayed to indicate indirect bandgap under am.ient conditions. The particular com.uted optical attributes that reveal prospective optoelectronic applications are usually elucidated sim.ly by studying ε1（0） and also Eg, which can be connected by m.ans of Penn＇s design. The optical details uncover the actual suitability to power ranging products. Finally, the Boltz Tra P code is executed to analyze the actual therm.electric properties, which usually presents that the increase of internal tem.eratures can enhance the electric conductivity, therm.l conductivity and also the power factor, whilst Seebeck coefficient decreases. Therefore, the studied m.terials will also be ideal for therm.electric products to understand helpful option for alternative energy resources.

关键词： sem.conductors elastic properties optical properties therm.l properties

Electronic and therm.electric properties of alkali m.tal-based perovskites CsYbF3 and RbYbF3

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Chinese Physics B 2020年第11期29卷 473-478页

作者： Q m.hm.od N A Noor T Ghrib Nessrin A Kattan Asif m.hm.od shahid m.ramay Basic and Applied Scientific Research Center Imam Abdulrahman Bin Faisal UniversityP.O.Box 198231441DammamSaudi Arabia Departm.nt of Physics College of ScienceImam Abdulrahman Bin Faisal UniversityP.O.Box 198231441DammamSaudi Arabia Departm.nt of Physics Riphah International UniversityLahorePakistan Departm.nt of Physics Faculty of ScienceTaibah UniversityMedinaSaudi Arabia Chem.cal Engineering Departm.nt College of EngineeringKing Saud UniversityRiyadhSaudi Arabia Physics and Astronom. Departm.nt College of ScienceKing Saud University RiyadhRiyadhSaudi Arabia

The electronic and therm.electric properties of alkali m.tal-based fluorides CsYbF3 and RbYbF3 are studied by using Wien2k and BoltzTraP *** structural and therm.dynam.c stability of these m.terials are confirm.d by tolerance factor(0.94 and 0.99 for RbYbF3 and CsYbF3)and negative form.tion *** optim.zed lattice constants and bulk m.duli are consistent with the results reported in the *** reported band gap for RbYbF3 is 0.86 eV which decreases to 0.83 eV by the replacem.nt of Cs with *** electrical and therm.l conductivities along with Seebeck coefficients decrease with tem.erature rising from.0 K to 800 *** large values of therm.electric param.ters for positive chem.cal potentials show that the character is dom.nated by *** studied m.terials have figures of m.rit 0.82 and 0.81 at room.tem.erature respectively,for RbYbF3 and CsYbF3 and increase with tem.erature ***,the m.terials under study m.y have potential application values in therm.electric generators and refrigerators.

关键词： density functional theory therm.dynam.c stability electrical conductivity figure of m.rit