scholarly journals Synthesis and characterization of NiFe2O4/ZnO core-shell nanocomposites

2018 ◽  
Vol 34 (4) ◽  
Author(s):  
Nguyen Duong
Keyword(s):  
Sodium Citrate ◽  
Structural Parameters ◽  
Xrd Analysis ◽  
Precipitation Method ◽  
Core Shell ◽  
X Ray Diffraction ◽  
Sem Images ◽  
The Core ◽  
Nife2o4 Nanoparticles ◽  
Co Precipitation

NiFe2O4/ZnO core-shell nanocomposites were prepared by two-step methodology. First, NiFe2O4 nanoparticles as the cores were synthesized by using hydrothermal method, and then modified by sodium citrate. After that ZnO as the shell was coated on modified NiFe2O4 nanoparticles by two different chemical methods including hydrothermal and co-precipitation. The formation, crystal structure, morphology and magnetic properties of the uncoated and coated samples were investigated by using X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and vibrating sample magnetometer. It was shown that the core nanoparticles are single phase of NiFe2O4 with cubic spinel structure. Sodium citrate was well bonded on the surface of the modified nanoparticles. Contributions of the phases in the coated samples as well as structural parameters were determined from XRD data on applying of Rietveld refinement analysis. Magnetization of the core can be improved by adjusting the modification steps. XRD analysis result and SEM images revealed the formation of core/shell structure in the sample coated by using co-precipitation method.

The Preparation and Characterization of LiFe0.98Mn0.02PO4/C by Spray-Drying and Low Temperature Reduction Route

2012 ◽  
Vol 581-582 ◽  
pp. 525-528
Author(s):  
Jia Feng Zhang ◽  
Bao Zhang ◽  
Xue Yi Guo ◽  
He Zhang Chen ◽  
Jian Long Wang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Spray Drying ◽  
Xrd Analysis ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Temperature Reduction ◽  
Co Precipitation ◽  
Low Temperature Reduction

The LiFe0.98Mn0.02PO4/C was synthesized by spray-drying and low temperature reduction route using FePO4•2H2O as precursor, which was prepared by a simple co-precipitation method. The LiFe0.98Mn0.02PO4/C sample was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and electrochemical measurements. The XRD analysis and SEM images show that sample has the good ordered structure and spherical particle. The charge-discharge tests demonstrate that the powder has the better electrochemical properties, with an initial discharge capacity of 162.1 mAh•g−1 and 155.8 mAh•g−1 at current density of 0.1 C and 1C, respectively. The capacity retention reaches 99.4% after 100 cycles at 1C.

scholarly journals PREPARATION AND CHARACTERIZATION OF CALCIUM FLUORIDE NANO PARTICLES FOR DENTAL APPLICATIONS

2018 ◽  
Vol 6 (1) ◽  
pp. 338-346 ◽  
Author(s):  
Mohammad S. Al-Ajely ◽  
Kareema M. Ziadan ◽  
Rafed. M. Al-Bader
Keyword(s):  
Elemental Composition ◽  
Calcium Fluoride ◽  
Structural Characteristics ◽  
Nano Particles ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Glass Type ◽  
Co Precipitation ◽  
Dental Applications

The aim of the present study was to prepare a calcium fluoride (CaF2NP) Nano particle which is used in dental composites as dental filling compo glass type. CaF2 Nano powders were prepared using a Co-precipitation method using binary liquid. Crystal Structural characteristics and Elemental composition of (CaF2NP) Nanoparticles were predicted by X-ray diffraction (XRD), which showed crystalline peaks of   this material. Elemental composition was obtained from EDX analysis.  Morphology and diameters of the Nano fibers were studied by scanning electron Microscope (SEM). The size of the particles was also measured from SEM images about 58 ± 21 nm.

Structural and Optical Characteristics of Ni Doped ZnS Nanoparticles

2013 ◽  
Vol 678 ◽  
pp. 159-162 ◽  
Author(s):  
G. Murali ◽  
D. Amaranatha Reddy ◽  
R.P. Vijayalakshmi ◽  
R. Venugopal
Keyword(s):  
Photo Luminescence ◽  
Xrd Analysis ◽  
Precipitation Method ◽  
Average Particle ◽  
X Rays ◽  
X Ray Diffraction ◽  
Luminescence Peak ◽  
Simple Chemical ◽  
Photoluminescence Studies ◽  
Co Precipitation

Nanocrystalline ZnS and Ni doped ZnS powders were synthesized by a simple chemical co-precipitation method at room temperature using sodium sulfide and acetates of Zinc and Nickel. 2-Mercapto ethanol is used as a capping agent. Structural and optical properties of as prepared samples were characterized using X-Ray diffraction (XRD), Scanning electron microscopy (SEM), Energy Dispersive Analysis using X-rays (EDAX) and Photoluminescence studies (PL). EDAX measurements confirmed the presence of Zn, Ni and S in the prepared samples. XRD analysis reveals that the Zn1-xNixS (x= 0.00 and 0.01) nanoparticles crystallized in zincblende structure. The average particle sizes of the nanoparticles are in the range of 2-3 nm. Shifting of photo luminescence peak to higher wavelength along with intensity quenching is observed for doped ZnS nanocrystals (NCs).

Synthesis and Gas Sensing Properties of SnO2-CuO Nanocomposites

2013 ◽  
Vol 645 ◽  
pp. 129-132 ◽  
Author(s):  
Jantasom Khanidtha ◽  
Suttinart Noothongkaew ◽  
Supakorn Pukird
Keyword(s):  
Room Temperature ◽  
Gas Sensing ◽  
Precipitation Method ◽  
Monoclinic Structure ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Co Precipitation

SnO2-CuO nanocomposites have been synthesized with the simple co-precipitation method for gas sensing properties. Sn and CuO powder were the starting materials. The synthesized products were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that SnO2-CuO nanocomposites have a tetragonal and monoclinic structure, respectively. SEM images verify that the some microballs are up to 10 µm and nanorods have a diameter range from 10-100 nm, while length ranges a few micrometers. The nanocomposite products were highly sensitivity to CO2gas at room temperature.

Comparison between Solid State Reaction and Coprecipitation Method of Titanium Oxide Addition on the YBa2Cu3Oδ Ceramics

2020 ◽  
Vol 1010 ◽  
pp. 187-193
Author(s):  
Ali Arlina ◽  
Nadiah Ameram ◽  
Nik Alnur Auli
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Single Phase ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Orthorhombic Crystal ◽  
Sem Images ◽  
Orthorhombic Crystal Structure ◽  
Oxide Addition ◽  
Co Precipitation

In this work, comparison of TiO2 additions on the physical properties of YBa2Cu3Oδ superconductor system with nominal starting compositions at x= 0, 1, 2, and 5 wt.% was studied derived via solid state reaction and co-precipitation method. The samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The result from XRD shown that all the samples were polycrystalline for solid state reaction, while single phase appear for co-precipitation methods. The intensity of the peak become higher with increasing amount of TiO2 addition indicating the presence of increased amount of the unreacted in the samples. The refine lattice parameters indicated that all the samples have an orthorhombic crystal structure without occurrence of orthorhombic-tetragonal phase transformation. Furthermore, from SEM images for solid state reaction and co-precipitation method showed that the grain size of the samples decreased with TiO2 increased. Small addition of TiO2 derived from co-precipitation method enhanced the YBCO microstructures.

scholarly journals Syntheses and Thermal Characterisation of Mixed (Sm-Y) Oxalates Prepared by Coprecipitation Method

2011 ◽  
Vol 8 (1) ◽  
pp. 113-117
Author(s):  
Presenjit Pauri ◽  
S. K. Ghoshal ◽  
H. S. Tewari
Keyword(s):  
Solid Solution ◽  
Thermal Decomposition ◽  
Thermal Treatment ◽  
Differential Scanning Calorimeter ◽  
Mixed Oxides ◽  
Xrd Analysis ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Co Precipitation

In this work, mixed (Sm1-xYx)2[C2O4]3.nH2O with x= 0.50 and 0.70 were prepared using standardized co precipitation method. All the synthesized oxalates were characterized by x-ray diffraction and differential scanning calorimeter. All the samples are homogeneous in stoichiometry. The XRD analysis of these synthesized samples reveals that a solid solution forms for these two compositions The thermal decomposition of the mixed oxalates is complex although completed a lower temperatures. This is an important result for the preparation of Sm-Y mixed oxides, because all the properties of the mixed oxides are intrinsic and depend only on their composition and thermal treatment schedules.

Synthesis of Core/Shell Type of Hybrid Magnetic Particle by Using Polyionic Copolymer with Extra Magnetic Field

2008 ◽  
Vol 594 ◽  
pp. 150-154
Author(s):  
Cheng Chien Wang ◽  
I Han Chen ◽  
Chun Rong Lin ◽  
Chuh Yung Chen
Keyword(s):  
Magnetic Field ◽  
Magnetic Particle ◽  
Cobalt Ferrite ◽  
Treatment Temperature ◽  
Precipitation Method ◽  
Core Shell ◽  
The Core ◽  
Shell Type ◽  
Co Precipitation ◽  
Ionic Copolymer

The core/shell type of cobalt ferrite nanocluster formed on the surface of the ionic copolymer microsphere was prepared by in-situ co-precipitation method. The low treatment temperature at 90°C with an external magnetic field (0.5T) was used instead of the traditional high temperature annealing procedure. Interestingly, the crystalline structure and saturation magnetization of cobalt ferrite nanoclusters preparing with extra magnetic field are better than that of no extra magnetic field from the XRD and VSM verification. Furthermore, the hollow sphere type of magnetic particle can be obtained when the ionic copolymer is extracted from the core/shell nanocomposite by using tetrahydrofuran solvent with supersonic oscillation.

Variations in Structural and Electrical Properties of Ba-Hexaferrite due to Pb Substitution

2012 ◽  
Vol 510-511 ◽  
pp. 448-453 ◽  
Author(s):  
Anwar Ul-Haq ◽  
M. Anis-ur-Rehman
Keyword(s):  
Structural Parameters ◽  
Random Access ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Structural And Electrical Properties ◽  
Regular Increase ◽  
Co Precipitation ◽  
High Dielectric ◽  
Electrical Characterizations ◽  
Pb Substitution

BaFe2-xPbxO9(x=0.0 to 1.0) samples were prepared by co-precipitation method. All samples were sintered at 960±5°C for three hours. Structural properties were investigated by X-ray diffraction (XRD) and Scanning electron microscopy (SEM). Variation in structural parameters was calculated from XRD obtained data. SEM micrographs were used to study the morphology and grain growth. No regular increase or decrease in structural parameters and morphology is observed with increase in Pb content. For dc electrical characterizations, dc resistivity was measured as a function of temperature up to 750K. Data obtained was further analyzed and different dc parameters like activation energy and mobility were measured. For dielectric analysis, capacitance C was measured in the frequency range from 100 kHz to 3MHz. High dielectric constant for this material makes this material suitable for applications like multilayer capacitors (MLC), microwave devices and dynamic random access memory (DRAM).

scholarly journals Crystal Chemistry, Magnetic and Dielectric Properties of Nickel Doped Strontium Ferrites

2021 ◽  
Vol 12 (1) ◽  
pp. 929-939
Keyword(s):  
Structural Parameters ◽  
Precipitation Method ◽  
Muffle Furnace ◽  
Sem Images ◽  
Ionic Radii ◽  
Eds Analysis ◽  
Average Grain Size ◽  
Co Precipitation ◽  
Strontium Ferrites ◽  
Super Exchange Interaction

The SrNixFe12−2xO19 (where x = 0.0–0.8) hexaferrites powders were synthesized using Co-precipitation method and the pellets were prepared at 1100 °C/4 h in muffle furnace. XRD, FTIR, SEM and EDS analysis were used to analyze the samples structural parameters. The changes in the lattice parameters ‘a’&‘c’ are due to the differences in ionic radii. The average grain size (<D>) was estimated from SEM images and found to be in between 1.713 m (x = 0) - 0.549 m (x = 1.0). Observations indicated a decrease in saturation magnetization decreased from 68 emu/g (x = 0.0) to 50 emu/g (x = 0.6) and for x > 0.6, MS increases to 64 emu/g (x = 0.8). The coercivity exhibit anisotropic variation with doping concentration. In the present investigation, the samples shows ε = 487; tanδ = 1.97 for x = 0.6, and ε = 181; tanδ = 1.01 for x = 0.8, respectively. The observed results can be explained on the basis of composition,relaxationphenomena and super exchange interaction.

Synthesis and Characterization of Ni/Mg/Al Mixed Oxides Obtained by Co-precipitation

2012 ◽  
Vol 1372 ◽  
Author(s):  
G. Martínez-Lozano ◽  
T. Kryshtab ◽  
M. Hesiquio Garduño ◽  
A. Kryvko
Keyword(s):  
Mixed Oxides ◽  
Xrd Analysis ◽  
Diffraction Peak ◽  
Precipitation Method ◽  
Particle Sizes ◽  
Extended Defects ◽  
X Ray Diffraction ◽  
X Ray ◽  
Co Precipitation

ABSTRACTNi/Mg/Al mixed oxides were obtained from hydrotalcite-like precursors by thermal decomposition at 400º, 600º and 800ºC using co-precipitation method at pH 7. The mixed oxides were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), and Energy-dispersive X-ray spectroscopy (EDS) techniques. XRD analysis revealed the formation of NixMg1-xO (x = 0 - 1), α-Al2O3 and traces of MgAl2O4 (NiAl2O4) phases. The diffraction peak positions for MgO or NiO oxides were shifted towards 2θ values higher than simulated for pure bulk oxides that can be attributed to the possible presence of lattice vacancies or surface compressive stress. The evaluated grain size by XRD technique was about 8 -10 nm. It was also detected the presence of microstrains that can be associated with the presence of extended defects in the grains. SEM observations showed that the particles of oxides are formed as agglomerates with the particle sizes of 50 nm up to 200 nm. EDS detected the presence of Mg2+, Ni2+, and Al3+ cations and oxygen in all particles independently on their size. The obtained results revealed the presence of mixture of Ni/Mg/Al oxides in each particle obtained. The oxides calcined at temperatures of 400º and 600ºC were unstable and under air storage they revert to the precursor. The incorporation of Ni2+ in Mg-Al mixed oxides leads to stability of the compounds calcined at 800ºC.

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