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

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International Journal of Minerals,Metallurgy and Materials 2013年第2期20卷 166-171页

作者： Ghulam Ali saadat a.siddiqi Shahid M.Ramay Shahid Atiq Murtaza Saleem Centre of Excellence in Solid State Physics University of the Punjab Interdisciplinary Research Centre in Biomedical Materials COMSATS Institute of Information Technology Chemical Engineering Department College of EngineeringKing Saud University

Cobalt （Co）-doped ***3 multiferroics were synthesized by a sol-gel method based on the auto- combustion technique. As-synthesized powder was examined 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 rhombohedral structure of BiFeO3, and the composition without Co preserves the original structure of the phase; however, a second-phase Bi2Fe409 has been identified in all other compositions. Surface morphological studies were performed by scanning electron microscopy. Temperature-dependent resistivity of the samples reveals the characteristic insulating behavior of the multiferroic material. The resistivity is found to decrease with the increase both in temperature and Co content. Room temperature frequency-dependent dielectric measurements were also reported. Magnetic measurements show the enhancement in magnetization with the increase in Co content.

关键词： multiferroics cobalt doping microstructure electric properties magnetic properties sol-gel process

Origin of Ferromagnetism in Al and Ni Co-doped ZnO Based DMS Materials

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

作者： Murtaza 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 compositions of nanocrystallites are synthesised using the well recognised auto-combustion *** x-ray diffraction patterns demonstrate the phase pure characteristic wurtzite-type crystal structure with space group P63mc in both the *** elemental incorporation of Ni and Al contents into the ZnO structure is confirmed by energy dispersive x-ray *** micrographs of scanning electron microscopy show an approximate ordered *** electrical resistivity is observed to decrease with the rising temperature,depicting the characteristic semiconductor behaviour of the *** lower values of resistivity and ferromagnetic interactions in the Al-doped sample correspond to an increase of carrier's *** is observed that the carrier mediated mechanism is mainly responsible for ferromagnetism in ZnO-based diluted magnetic semiconductors.

关键词： resistivity diluted Origin

Induced modifications in the properties of Sr doped BiFeO3 multiferroics

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Progress in Natural Science:Materials International 2013年第5期23卷 487-492页

作者： Tanvir Hussain saadat a.siddiqi Shahid Atiq M.S.Awan Centre of Excellence in Solid State Physics Quaid-e-Azam CampusUniversity of the Punjab Interdisciplinary Research Centre in Biomedical Materials (IRCBM) COMSATS Institute of Information Technology Department of Physics COMSATS Institute of Information Technology

Multiferroics exhibit unique combination of ferroic properties,*** instance,in BiFeO3,magnetic and electric properties *** this work,BiFeO3 and Sr-doped BiFeO3 samples with general formula,Bi1-x Srx FeO3(x=0.00,0.05,0.10,0.20,and 0.30) were synthesized by sol-gel auto-combustion technique,in order to investigate these ferroic *** samples were confrmed to have perovskite type rhombohedral structure,characteristic of BiFeO3.A dilute phase of Bi2Fe4O9was also found in all the Sr-doped *** micrographs of the palletized samples revealed that minutely doped Sr might not have any effect on the morphology of the *** dependent dielectric measurements were carried out at room temperature for all the samples from 100 Hz to 1 *** dielectric constant of un-doped sample at low frequency was 52 which decreased with increasing Sr *** enhancement of magnetic properties was observed with increasing the Sr *** BiFeO3 material was observed to have the least value of remanent *** the Sr2+ tions were doped in BiFeO3,its magnetization and remanence were increased to 0.867 emu/g and 0.175 emu/g,respectively,at x=0.30.

关键词： Bismuth ferrite Ferroelectricity Ferromagnetism Nanomaterials Magnetically ordered materials

Mg and Ni Incorporated ZnO Diluted Magnetic Semiconductor for Magnetic and Photo-Catalytic Applications

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Chinese Journal of Chemical Physics 2020年第6期33卷 743-748,I0003页

作者： Tahir Iqbal M.Irfan Shahid M.Ramay Abdullah Alhamidi Hamid Shaikh Murtaza Saleem saadat a.siddiqi Department of Physics Mirpur University of Science and TechnologyMirpur 10250 AJKPakistan Physics and Astronomy Department College of ScienceKing Saud UniversityRiyadhSaudi Arabia SABIC Polymer Research Center Chemical Engineering DepartmentKing Saud UniversityP.O.Box 800Riyadh 11421Saudi Arabia School of Science and Engineering Lahore University of Management SciencesLahore 54792Pakistan IRCBM COMSATS University IslamabadLahore CampusLahore-54600Pakistan

Zinc oxide is recently being used as a magnetic semiconductor with the introduction of mag-netic *** this work,we report phase pure synthesis of Mg and Ni co-substituted ZnO to explore its structure,optical,magnetic and photo-catalytic properties.X-ray di raction analysis reveals the hexagonal wurtzite type structure having P63mc space group without any impurity ***-Vis spectrophotometry demonstrates the variation in bandgap with the addition of Mg and Ni content in ZnO *** measurements exhibit a clear boosted magnetization in Ni and Mg co-doped compositions with its stable value of bandgap corroborating the structural stability and magnetic tuning for its advanced applications in modern-day spintronic ***-catalytic measurements performed using methyl green degradation demonstrate an enhanced trend of activity in Mg and Ni co-doped compositions.

关键词： Dilute magnetic semiconductors X-ray di raction UV-Vis spectrophotometry Magnetic properties Photo-catalysis

Room Temperature Magnetic Behavior of Sol-Gel Synthesized Mn Doped ZnO

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Chinese Journal of Chemical Physics 2010年第4期23卷 469-472,I0002页

作者： Murtaza Saleem saadat A. siddiqi Shahid Atiq M. Sabieh Anwar Saira Riaz 旁通普大学固态物理中心拉赫尔54590 拉赫尔管理科学大学科学与工程学院拉赫尔54792

Mn doped ZnO nano-crystallites were synthesized by state of the art sol-gel derived auto- combustion technique. As-burnt powder was investigated with different characterization techniques to explore the properties of Mn doped ZnO dilute magnetic semiconductor. X- ray diffraction measurements indicate that Mn doped ZnO retain wurtzite type hexagonal crystal structure like ZnO. Compositional and morphological studies were carried out by energy dispersive X-ray analysis and scanning electron microscopy, respectively. Temperature dependent resistivity of the sample exhibited the semiconducting behavior of the DMS material. Room temperature magnetic properties determined by vibrating sample magnetometer, revealed the presence of ferromagnetic and diamagnetic contributions in Mn doped ZnO.

关键词： Nanocrystal Diluted magnetic semiconductor Auto-combustion Room temperature ferromagnetism

Structural, Magnetic, and Electrical Properties of Al3＋ Substituted CuZn-ferrites

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Chinese Journal of Chemical Physics 2010年第5期23卷 591-595,622页

作者： S.M.Ramay saadat A: siddiqi S. Atiq M. S. Awan S Riaz 巴基斯坦旁遮普邦大学阈态物理中心拉合尔54590 巴基斯坦拉合尔管理与科学大学科学与工程学院拉合尔54972 巴基斯坦COMSATS信息职业技术学院伊斯兰堡

NanocrystallineCuo5Zno5Fe2-xAlxO2（x=0.0,0.1,0.2,0.3,0.45 and 0.5） ferrite materials were synthesized using standard solid state reaction technique. The effects of Al3＋ contents on the structural, electrical, and magnetic properties were investigated. Single phase cubic spinel structure was revealed by X-ray diffraction analysis. The crystallite size was evaluated considering the most intense diffraction peak （311） using Scherrer formula. Lattice constant decreased, whereas porosity increased with the increase in Al3＋ concentration. The value of saturation magnetization decreased with increasing aluminum contents. Temperature dependent value of direct current electrical resistivity has been determined. It is observed that the substitution of Al3＋ has significant impact on the dielectric constant, tangent of dielectric loss angle and dielectric loss factor. The variation in dielectric properties was attributed to space charge polarization.

关键词： Oxide material Ferrite Solid state reaction Electrical resistivity Dielectricconstant

铝掺杂ZnMnO纳米晶体的载流子调控铁磁性（英文）

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Chinese Journal of Chemical Physics 2013年第4期 457-461+494页

作者： Shahid Atiq saadat a.siddiqi Fazal Abbas Murtaza Saleem Shahid M.Ramay 巴基斯坦旁遮普邦大学奎德-E-阿扎姆分校固态物理研究中心巴基斯坦COMSATS信息技术研究院生物医学材科交叉学科研究中心沙特阿拉伯国王大学工程学院化学工程系

通过溶胶-凝胶自燃烧技术合成了Zn0.95-xAlxMn0.05O（x=0、0.03、0.05和0.07）稀磁半导体材料.并且研究了Al掺杂对Zn0.95-xAlxMn0.05O结构、电学和磁学性质的效果.X射线衍射显示合成的组合物为单相六方晶系纤锌矿型晶体结构,类似于氧化... 详细信息

通过溶胶-凝胶自燃烧技术合成了Zn0.95-xAlxMn0.05O（x=0、0.03、0.05和0.07）稀磁半导体材料.并且研究了Al掺杂对Zn0.95-xAlxMn0.05O结构、电学和磁学性质的效果.X射线衍射显示合成的组合物为单相六方晶系纤锌矿型晶体结构,类似于氧化锌.显微图像显示颗粒呈团簇状,但一些单个颗粒呈现六角形纹理.观察到的电阻率随温度升高（达450℃）而降低,显示为半导体行为特征.所有组合物具有室温铁磁行为.饱和磁化强度的值随着Al（载流子）浓度的增加而增加.

关键词：稀磁半导体材料溶胶-凝胶 Al掺杂ZnMnO 铁磁性

Enhancement in energy product in Sm-Co/Fe exchange coupled magnetic layers with molybdenum interlayers

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Journal of Rare Earths 2010年第2期28卷 274-276页

作者： Furrukh Shahzad saadat Anwar siddiqi Centre for Solid State Physics University of the Punjab School of Physics and Microelectronics Shandong University

Trilayers of Sm-Co/Mo/Fe were deposited by DC and RF magnetron sputtering on Si(100) substrate at 650 °*** of very thin Mo interlayers on energy product of magnetic layers was *** the samples showed strong exchange coupling and single phase *** increasing Mo interlayer thickness,we observed oscillating behavior of saturation magnetization and energy *** rise in energy product was observed as 22% for 0.3 nm Mo interlayer as compared to sample without Mo interlayer.

关键词： exchange spring magnet nanocomposite (BH)max product rare earths

Synthesis and Characterization of Alkaline-Earth Metal (Ca, Sr, and Ba) Doped Nanodimensional LaMnO_(3) Rare-Earth Manganites

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Chinese Physics Letters 2013年第7期30卷 217-220页

作者： Asma Khalid saadat Anwar siddiqi Affia Aslam School of Physics University of MelbourneParkville VIC 3010Australia Interdisciplinary Research Centre in Biomedical Materials COMSATS Institute of Information TechnologyDefence RoadOff Raiwind RoadLahore-54700Pakistan Department of Physics University of HailHail-30055Saudi Arabia

The substitution of divalent cations of alkaline-earth elements in nanodimensional structures of rare-earth manganites produces advanced materials with potential electrical and magnetic functionalities.A systematic investigation of La_(0.65)A_(0.35)MnO_(3)(A=Ca,Sr,Ba)materials synthesized with a modified citrate route adopting ethanol dehydration has been *** structural and morphological analyses are carried out by using x-ray diffraction and scanning electron microscopy,*** measurements are performed in variation with temperature to study the electrical transport properties which are found to vary with the size of the A-site cationic *** temperature magnetic measurements are carried out to investigate the type of magnetic phase present in *** stability of the magnetic phase and coercivity are found to be dependent on the size of nanocrystallites.

关键词： materials. earth dimensional