scholarly journals A facile approach for obtaining NiFe­2O4/C nanocomposites and their magnetic properties assessment

2020 ◽  
Author(s):  
Hamed Bakhshi ◽  
Maryam Mohammad Azari ◽  
Ali Shokuhfar
Keyword(s):  
Magnetic Properties ◽  
Vapour Deposition ◽  
X Ray Diffraction ◽  
Disordered Carbon ◽  
Ft Ir ◽  
Nife2o4 Nanoparticles ◽  
Vibration Sample Magnetometer ◽  
Coating Time ◽  
Defect Densities ◽  
Made In

Abstract NiFe2O4/C nanocomposites were prepared using the two-step process, including reverse microemulsion followed by thermochemical vapour deposition (TCVD). Micelles made in the first step worked well and NiFe2O4 nanoparticles owing sizes smaller than 10 nanometer with narrow size distribution were obtained. Acetylene gas was used as a carbon source for deposition on the surface of NiFe2O4 nanoparticles. Coating applied for 1 and 2 h at 700°C and resulted in an enhancement of NiFe2O4 nanoparticle size to a level of 30 nanometer. Powder X-ray diffraction (PXRD) patterns revealed the spiel formation for all samples; however, the crystallinity of them has been increased as much as temperature rose to a level of coating. Fourier transform infrared spectroscopy (FT-IR) verified the metal-oxygen bonding linked to the octahedral and tetrahedral vibrations. Micro-Raman spectra for the coated samples were recorded as well, and the results confirmed the existence of ordered and disordered carbon-based materials in nanocomposites. It is noteworthy to mention that, in the sample with 2 h coating time, the defect densities were lower than the sample with an hour coating time. The vibration sample magnetometer (VSM) was also used to investigate the magnetic properties. The as-prepared sample behaves like a superparamagnetic matter; however, the coated ones behave like ferromagnetic materials. The saturation magnetization and coercivity of coated samples were lower than their bulk counterparts which was due to their smaller size.

CdS Powders Obtained by Chemical Bath Deposition

2011 ◽  
Vol 672 ◽  
pp. 109-112
Author(s):  
Violeta Popescu ◽  
George Liviu Popescu ◽  
Emil Indrea ◽  
Dan Teofil Silipas
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Chemical Bath Deposition ◽  
Cadmium Chloride ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir ◽  
Made In

We studied the influence of the mixing on the properties of CdS powders obtained by Chemical Bath Deposition. The powders were obtained from baths containing cadmium chloride, thiourea, and ammonia. The obtained powders were characterized using FT-IR, in order to evaluate the purity of the obtained powder. Granulometric studies were made in order to establish the grain size distribution of the particles, and X ray diffraction in order to determine the structure of nanostructured CdS.

scholarly journals Structural, Optical, and Magnetic Properties of NiMoO4Nanorods Prepared by Microwave Sintering

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Ana P. de Moura ◽  
Larissa H. de Oliveira ◽  
Ieda L. V. Rosa ◽  
Camila S. Xavier ◽  
Paulo N. Lisboa-Filho ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Microwave Sintering ◽  
Cluster Structure ◽  
Chemical Properties ◽  
X Ray Diffraction ◽  
Field Emission Microscopy ◽  
Optical And Magnetic Properties ◽  
Physical And Chemical ◽  
Defect Densities ◽  
Ft Raman

We report on the structural, optical, and magnetic properties ofα,β-NiMoO4nanorods synthesized by annealing the NiMoO4:nH2O precursor at 600°C for 10 minutes in a domestic microwave. The crystalline structure properties ofα,β-NiMoO4were investigated using X-ray diffraction (XRD), Fourier transform infrared (FTIR), and Raman (FT-Raman) spectroscopies. The particle morphologies and size distributions were identified by field emission microscopy (FE-SEM). Experimental data were obtained by magnetization measurements for different applied magnetic fields. Optical properties were analyzed by ultraviolet-visible (UV-vis) and photoluminescence (PL) measurements. Our results revealed that the oxygen atoms occupy different positions and are very disturbed in the lattice and exhibit a particular characteristic related to differences in the length of the chemical bonds (Ni-O and Mo-O) of the cluster structure or defect densities in the crystallineα,β-NiMoO4nanorods, which are the key to a deeper understanding of the exploitable physical and chemical properties in this study.

Preparation of Strontium Ferrite Powders by Mechanochemical Process

2011 ◽  
Vol 110-116 ◽  
pp. 1736-1740 ◽  
Author(s):  
Ju Hua Luo
Keyword(s):  
Magnetic Properties ◽  
Room Temperature ◽  
Single Phase ◽  
Raw Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Starting Mixture ◽  
Ft Ir ◽  
Mechanochemical Treatments ◽  
Firing Method

Sr-ferrite powders were preparated by mechanochemical treatments using SrCO3 and Fe2O3 as raw materials. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), vibrating sample magnetometry (VSM) were employed to evaluated the morphologies, structures and magnetic properties of samples. The results indicated that the starting mixture became amorphous stage after ball-milled for 30h, and single phase SrFe12O19 could be obtained after annealed at 900°C for 2h. And the saturation magnetization was 58.2Am2/kg, and coercivity was 281.2 kA/m at room temperature. In comparison with the traditional firing method , the mechanochemical method benefited achieving the higher coercivity, which indicated that the samples had a better magnetic properties.

scholarly journals The Structural and Magnetic Properties of FeII and CoII Complexes with 2-(furan-2-yl)-5-pyridin-2-yl-1,3,4-oxadiazole

Molecules ◽  
2020 ◽  
Vol 25 (2) ◽  
pp. 277 ◽  
Author(s):  
Pavel Zoufalý ◽  
Erik Čižmár ◽  
Juraj Kuchár ◽  
Radovan Herchel
Keyword(s):  
Magnetic Properties ◽  
Magnetic Measurements ◽  
Chemical Properties ◽  
Static Field ◽  
X Ray Diffraction ◽  
Paramagnetic Resonance ◽  
Physico Chemical ◽  
X Band ◽  
Spin Arrangement ◽  
Ft Ir

Two novel coordination compounds containing heterocyclic bidentate N,N-donor ligand 2-(furan-2-yl)-5-(pyridin-2-yl)-1,3,4-oxadiazole (fpo) were synthesized. A general formula for compounds originating from perchlorates of iron, cobalt, and fpo can be written as: [M(fpo)2(H2O)2](ClO4)2 (M = Fe(II) for (1) Co(II) for (2)). The characterization of compounds was performed by general physico-chemical methods—elemental analysis (EA), Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR) in case of organics, and single crystal X-ray diffraction (sXRD). Moreover, magneto-chemical properties were studied employing measurements in static field (DC) for 1 and X-band EPR (Electron paramagnetic resonance), direct current (DC), and alternating current (AC) magnetic measurements in case of 2. The analysis of DC magnetic properties revealed a high spin arrangement in 1, significant rhombicity for both complexes, and large magnetic anisotropy in 2 (D = −21.2 cm−1). Moreover, 2 showed field-induced slow relaxation of the magnetization (Ueff = 65.3 K). EPR spectroscopy and ab initio calculations (CASSCF/NEVPT2) confirmed the presence of easy axis anisotropy and the importance of the second coordination sphere.

The guanidinium t-diaqua-bis(oxalato)chromate(III) dihydrate complex: synthesis, crystal structure, EPR spectroscopy and magnetic properties

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Idelle Nono Kamga ◽  
Augustin Nkwento Nana ◽  
Bridget Ndoye Ndosiri ◽  
Frédéric Capet ◽  
Michel Foulon ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Three Dimensional ◽  
X Ray Diffraction ◽  
Paramagnetic Resonance ◽  
Dimensional Network ◽  
Ft Ir ◽  
Water Ligands ◽  
Electron Paramagnetic ◽  
Oxygen Atoms

Abstract A new salt (CH6N3)[t-Cr(C2O4)2(H2O)2]·2H2O (1) (CH6N3 + = guanidinium cation) has been synthesized and characterized by single-crystal X-ray diffraction, FT-IR and UV–Vis spectroscopies, elemental and thermogravimetric analyses. In the crystal structure of 1, the chromate(III) ion lies on an inversion center in the form of an elongated octahedron. The coordination sphere consists of four oxygen atoms of two chelating oxalato ligands in the equatorial plane and two axial oxygen atoms of water ligands. The structural feature of focal interest in the structure of 1 is the formation of pillars of [Cr(C2O4)2(H2O)2]− complex anions and CH6N3 + guanidinium cations, with the next-neighbor cations rotated by an angle of 60° relative to each other. O–H···O and N–H···O hydrogen bonds play an important role in the construction of the three-dimensional network. The electron paramagnetic resonance (EPR) and magnetic properties of 1 have also been investigated.

scholarly journals SYNTHESIS AND MAGNETIC PROPERTIES OF BINUCLEAR COMPLEX [N(n-C4H9)4][MnIIFeIII(ox)3]

2012 ◽  
Vol 12 (1) ◽  
pp. 89-93
Author(s):  
Fahimah Martak ◽  
Hamzah Fansuri ◽  
Sekarayu Dianing Putri
Keyword(s):  
Magnetic Properties ◽  
Magnetic Moment ◽  
Binuclear Complex ◽  
Organic Cation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Tetrabutyl Ammonium ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Binuclear complex, [N(n-C4H9)4][MnIIFeIII(ox)3] (ox=oxalate), has been synthesized and characterized. Binuclear complex with formula of [N(n-C4H9)4][MnIIFeIII(ox)3] was synthesized by forming precursor K3[Fe(ox)3] which was followed by adding manganese chloride and tetrabutyl ammonium chloride. Characterization of the complex was made by microanalysis, FT-IR spectroscopy, x-ray diffraction and Magnetic Susceptibility Balance. Magnetic moment of binuclear complex [N(n-C4H9)4][MnIIFeIII(ox)3] is 7.81 BM. The compound has higher magnetic moment than the previously reported compound with different organic cation, [N(n-C5H11)4][MnIIFeIII(ox)3]. This behavior might be associated with the decreasing range among layers on polymeric network.

Influence of Cyclodextrin in the Synthesis of Magnetite

2009 ◽  
Vol 1243 ◽  
Author(s):  
L. A. Cobos Cruz ◽  
C. A. Martínez Perez ◽  
A Martínez Villafañe ◽  
J. A. Matutes Aquino ◽  
J. R. Farias Macilla ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Inorganic Material ◽  
Inorganic Nanoparticles ◽  
Spherical Particles ◽  
X Ray Diffraction ◽  
Guest Molecules ◽  
X Ray ◽  
Ft Ir ◽  
Scanning Electron ◽  
Made In

ABSTRACTCyclodextrin (CD) has been studied intensively due to its ability to form inclusion complexes with a variety of guest molecules in the solid state. A few studies have paid attention to the use of CD to facilitate the synthesis of inorganic nanoparticles. In this work the synthesis of magnetite (M) is made in the presence of CD. The particle size of the inorganic material is controlled by the presence of CD, in which spherical particles of few nanometers are grown. The synthesis of Fe3O4 (M) in the presence of α-cyclodextrin (α-CD) and β-cyclodextrin (βCD) is described. The formation of an M-CD complex is studied in both cases by Fourier transform infrared spectroscopy (FT-IR) in order to elucidate the chemical bonding of the complex. The morphology and size of the particles are determined by Field Emission Scanning Electron Microscopy (FESEM) and software. X-ray diffraction (XRD) is used to confirm the formation of magnetite.

Preparation of Porous Fe-Ni Soft Magnetic Powders by Fe-N Alloys Transformation

2012 ◽  
Vol 217-219 ◽  
pp. 1121-1125
Author(s):  
Guo Dong Cui ◽  
Yan Shuo Zhang ◽  
Chuan Yang ◽  
Hai Chun Jiang ◽  
Guo Qing Gao
Keyword(s):  
Magnetic Properties ◽  
Soft Magnetic Property ◽  
X Ray Diffraction ◽  
Soft Magnetic ◽  
X Ray ◽  
Gas Nitriding ◽  
Ni Powder ◽  
Vibration Sample Magnetometer ◽  
N Powder ◽  
Scanning Electron

The porous Fe-Ni powders were successfully prepared by the gas nitriding, electroless plating and then removal of denitrogen & phosphorus under high temperature. The phases of the powders were determined by X-ray diffraction (XRD) utilizing Cu Ka radiation. Scanning electron microscope (SEM) was used to characterize the morphology of the porous powders. The magnetic properties of the powders were measured by a vibration sample magnetometer (VSM). The result shows that the porous Fe-Ni-N powder was mainly composed of γ’-Fe4 N and FeNi3 while the porous Fe-Ni powders were comprised by Fe0.64Ni0.36 and Ni. The porous Fe-Ni powder has a good soft magnetic property with Saturation Magnetization of 113.5emu/g and coercivity of 162.9Oe.

Structural, Electrical and Magnetic Properties of Ni Doped Co-Zn Nanoferrites and their Application in Photo-Catalytic Degradation of Methyl Orange Dye

2015 ◽  
Vol 232 ◽  
pp. 197-211 ◽  
Author(s):  
Santosh Bhukal ◽  
Sandeep Bansal ◽  
Sonal Singhal
Keyword(s):  
Magnetic Properties ◽  
Sol Gel ◽  
Nickel Concentration ◽  
X Ray Diffraction ◽  
Absorption Bands ◽  
Electrical And Magnetic Properties ◽  
Ir Studies ◽  
Increase With Increase ◽  
Ft Ir ◽  
Diffraction Patterns

Nickel substituted cobalt zinc nanoferrites (Co0.6Zn0.4NixFe2-xO4, x=0.2, 0.4, 0.6, 0.8 and 1.0) were successfully synthesised by sol gel method. FT-IR studies showed two absorption bands in the range of 400-600 cm-1corresponding to the M-O bond in the tetrahedral and octahedral clusters, respectively. Powder X-ray diffraction patterns revealed that all the samples had cubic structure with Fd-3m space group.The lattice constant was observed to increase with increase in nickel substitution, thus altering the unit cell volume. An examination of the magnetic properties revealed an increase in saturation magnetization with increasing Ni concentration upto x=0.4, and a decrease there after.These results could be explained using Neel's collinear two-sub-lattice model and three sub-lattice non-collinear model suggested by Yafet and Kittel. DC resistivity was found to decrease with increase in temperature due to semiconductor nature of nanoferrites. The catalytic activity was found to be maximum at x = 0.2 and further found to decrease with increase in nickel concentration

scholarly journals Annealing effect on the microstructural and magnetic properties of Er2.5Y0.5Fe5O12 films prepared by sol-gel method

2014 ◽  
Vol 6 (2) ◽  
Author(s):  
Ramadan E. Shaiboub ◽  
Noor Ibrahim ◽  
Mustafa Abdullah ◽  
Ftema W. Abdulhade
Keyword(s):  
Magnetic Properties ◽  
Sol Gel ◽  
Lattice Parameter ◽  
X Ray Diffraction ◽  
Electron Microscopic ◽  
Ionic Radii ◽  
Xrd Pattern ◽  
Different Temperatures ◽  
Vibration Sample Magnetometer ◽  
Sol Gel Films

The effect of annealing on the microstructural and magnetic properties of Er2.5Y0.5Fe5O12 sol-gel films were studied at different temperatures using X-ray diffraction (XRD), field emission scanning electron microscopic (FESEM) and vibration sample magnetometer (VSM).The results show that the XRD pattern of the samples have a single phase garnet structure with reduction in the lattice parameter of Er:YIG films due to the smaller ionic radii of Er3+ compare to Y3+. The sizes of the particles are in the range of 50 to 90 nm. The saturation magnetization (Ms) increase and then decreases as the temperature increased.

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