scholarly journals Magnetic and Microwave Absorbing of Mn(1-x)NdxFe2O4 Synthesized with Co-Precipitation Method

2018 ◽  
Vol 19 (1) ◽  
pp. 17
Author(s):  
Mia Adha ◽  
Y. Yunasfi ◽  
N. Nurhasni
Keyword(s):  
Magnetic Measurement ◽  
Precipitation Method ◽  
Ferromagnetic Behavior ◽  
Phase Identification ◽  
Network Analyzer ◽  
X Ray ◽  
Formed Precipitate ◽  
Microwave Absorbing ◽  
Co Precipitation

Characterization of magnetic and microwave absorbing properties of Mn(1-x)NdxFe2O4 synthesized with co-precipitation method have been carried out. Mn(1-x)NdxFe2O4 (with x = 0.0; 0.4; and 0.8) powders was synthesized from mixture of NiCl2, NdCl3 and FeCl3 in mole ratio. Mixing of this powders were soluted with NH4OH 4M up to pH = 9.0. The formed precipitate were washed with demineralized water up to pH = 7.0 and then dryed at 120 oC for 5 h, sintered at 1200 for 3 h. Phase identification with X-ray diffractometer (XRD) have formed composite multiphases, which indicated by the appearance of MnFe2O4, NdFeO3 and Fe2O3 phase. The magnetic measurement using VSM (vibrating sample magnetometer) showed that the sample exhibited a ferromagnetic behavior, the Ms value is lower (in the range of 30 – 11 emu/g) while the Hc value is greater (in the range of 111 – 132 Oe) with increased concentration of Nd3+ ion (x values). Measurement by VNA (Vector Network Analyzer) showed the ability of absorption of microwaves increased with increasing content of Nd3+ ion, the composition of x = 0.0 at about 70% and addition of Nd3+ ion up to composition x = 0.8 at about 91%. Keywords: MnNd ferrite, co-precipitation methode, magnetic properties, microwave absorption

Synthesis and Characterization of Magnetite Particles by Co-Precipitation Method

2012 ◽  
Vol 512-515 ◽  
pp. 82-85 ◽  
Author(s):  
Ming Ya Li ◽  
Xu Dong Sui
Keyword(s):  
Spinel Structure ◽  
Bath Temperature ◽  
Precipitation Method ◽  
Scanning Electronic Microscopy ◽  
Electronic Microscopy ◽  
X Ray ◽  
Magnetite Particles ◽  
Co Precipitation ◽  
Different Diameters

The Fe3O4 nanoparticles with different diameters were prepared by co-precipitation method in this paper. Magnetite particles with different diameters were fabricated by changing the concentration of the reactants and the reaction temperature. The influences of process parameters on the microstructure and properties of magnetic nanopariticles were studied. The obtained samples were characterized by X-ray powder diffraction and scanning electronic microscopy. Besides, vibrating sample magnetmeter was used to characterize the magnetic properties. The results show that all the as-synthesized magnetite nanoparticles are well crystallized and can be indexed into spinel structure. The appearance and magnetism of the particles with different diameter are different from each other. When the ratio of Fe3+ and Fe2+ is 2:1 or 4:3, the product was pure and good crystalline. Furthermore, higher saturation magnetization was obtained in a higher bath temperature.

Study on Preparation and Characterization of YAG Ceramic Synthesized by Co-Precipitation

2011 ◽  
Vol 284-286 ◽  
pp. 1317-1320
Author(s):  
Quan Shui Chen ◽  
Xiao Dong Liu ◽  
Guang Yuan Ren ◽  
Pan Yi Liang ◽  
Hui Ma
Keyword(s):  
Electron Probe ◽  
Precipitation Method ◽  
Yttrium Aluminium Garnet ◽  
Mineral Phase ◽  
X Ray ◽  
Yttrium Aluminium ◽  
Good Crystallinity ◽  
Co Precipitation ◽  
Scanning Electron

Yttrium Aluminium Garnet (YAG) has a extensive applications in many fields because of its excellent properties. In this study the products synthesized by co-precipitation method is regular, and the reaction is complete, the YAG ceramic obtained is white, its density is 2.42g/cm3 and shrinkage is 7.78%. The YAG ceramic tablets were investigated by Field emission scanning electron microscopy (FE-SEM), Electron probe microanalysis (EPMA) and X-ray diffractometer (XRD). The results show that the structure of YAG ceramic is loose with spherical grain size of 0.2-0.3μm. The main mineral phase of YAG ceramic is composed of polycrystalline Al5Y3O12 with good crystallinity, and containing very small amount of unreacted alumina and other impurities.

scholarly journals Synthesis and Characterization of ZnS Nanoparticles Using Co-precipitation Method

2020 ◽  
pp. 26-33
Author(s):  
S. Mohanapriya ◽  
M. Vennila ◽  
S. Kowsalya
Keyword(s):  
Sodium Sulfide ◽  
Optical Characterization ◽  
Precipitation Method ◽  
Synthesis And Characterization ◽  
Precipitation Reaction ◽  
Zns Nanoparticles ◽  
X Ray ◽  
Homogeneous Chemical ◽  
Co Precipitation

ZnS nanoparticles were prepared from homogeneous chemical co-precipitation reaction by using zinc acetate, sodium sulfide [Na2S] and Poly Vinyl Polypyrrolidone [PVP]. The basic, morphological, and optical properties of the synthesized nanoparticles were characterized using Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), Energy Dispersive X-ray Analysis (EDX) and Ultraviolet-Visible (UV-Vis) absorption. The structural and optical characterization of the samples observed by SEM, FTIR, EDX and UV-Vis spectrometer showed that ZnS nanoparticles were formed.

Synthesis and Characterization of Structure of Fe3O4@Graphene Oxide Nanocomposites

2016 ◽  
Vol 25 (6) ◽  
pp. 096369351602500 ◽  
Author(s):  
Ruimin Fu ◽  
Mingfu Zhu
Keyword(s):  
Graphene Oxide ◽  
Drug Carrier ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Ft Ir ◽  
Co Precipitation ◽  
Ft Ir Spectroscopy

Nowadays, the hummers method for preparation of graphene oxide (GO) was improved. The grapheme oxide @ Fe3O4 magnetic nanocomposites were synthesized by co-precipitation method. After analysing the morphology and structure of obtained nanocomposites by X-ray diffraction (XRD), transmission electron microscope (TEM) and Fourier transform infrared (FT-IR) spectroscopy, the result was shown as follows. The particle size of Fe3O4 in nanocomposites is 30 nm. Many functional groups are found in grapheme oxide, and such groups could be used to bind with the drug. In the test for magnetic properties, the nanocomposites gathered rapidly in the vicinity of the permanent magnet. The nanocomposites, with high superparamagnetism, can be used in the following applications: drug targeting transports, drug carrier, and diagnosis assistant system.

Study of Preparation, Characterization and Temperature-Programmed Reduction of NiO-ZnO Binary Materials

2013 ◽  
Vol 664 ◽  
pp. 515-520
Author(s):  
Chih Wei Tang ◽  
Jiunn Jer Hwang ◽  
Shie Hsiung Lin ◽  
Chin Chun Chung
Keyword(s):  
Weight Percent ◽  
Precipitation Method ◽  
Temperature Programmed Reduction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Surface Areas ◽  
Temperature Programmed ◽  
Co Precipitation ◽  
Adsorption Desorption

The NiO-ZnO binary materials had been prepared by co-precipitation method. The weight percent of nickel of NiO-ZnO materials were 5, 10 and 20; they were pretreated under air at temperature of 300, 500 and 700°C, respectively. The characterization of NiO-ZnO materials were the thermal gravity analysis(TGA), X-ray diffraction(XRD), N2 adsorption-desorption at 77K, scaning electron microscope(SEM) and temperature-programmed reduction(TPR). The results revealed that surface areas of NiO-ZnO materials order from large to small were 20NiZn(OH)x(66 m2·g-1) > 10NiZn(OH)x(34 m2·g-1) > 5NiZn(OH)x(9 m2·g-1) after being calcined at the temperature of 500°C. Further, NiO-ZnO materials had two main reductive peaks at 390-415°C and 560-657°C, respectively. In all NiO-ZnO materials, 20NiZn(OH)x-C500 material had the highest surface area and the best interaction between NiO and ZnO.

SYNTHESIS AND CHARACTERIZATION OF (CdSe)1-X(ZnS)x MIXED POLYCRYSTALLINE SEMICONDUCTORS BY CO-PRECIPITATION METHOD

2002 ◽  
Vol 16 (19) ◽  
pp. 2885-2899
Author(s):  
K. YADAIAH ◽  
ABDUL NAYEEM ◽  
M. SOMI REDDY ◽  
M. NAGABHOOSHANAM
Keyword(s):  
Energy Gap ◽  
Nitrogen Atmosphere ◽  
Hexagonal Structure ◽  
Ion Source ◽  
Precipitation Method ◽  
Scanning Electron Micrographs ◽  
Chemical Homogeneity ◽  
X Ray ◽  
Co Precipitation

The polycrystalline (CdSe)1-x (ZnS)x semiconductor powder with (0 ≤ x ≤ 1) has been prepared by controlled co-precipitation method from an alkaline medium using thiourea as a sulphide ion source. Pellets are made out of these powders under 10 tonnes/sq.cm pressure and are sintered at 800°C for 2 hours in nitrogen atmosphere. X-ray studies have indicated that the compounds are polycrystalline in nature with mixed hexagonal structure of CdSe with x = 0-0.3 and cubic structure of ZnS with x = 1. The chemical homogeneity of the samples was observed from the EDAX and also noted that the atomic contents present were as per the constituents taken in the solution. Lattice parameters (a and c) of all the compounds are determined from the X-ray data and are found to decrease with the increase in ZnS content. It is also observed that the grain size decreases with the increase in x from 0-0.6 and later it remained almost the same till x reaches 0.9. Optical studies indicated that the energy gap was as high as 5.2 eV and remained almost same throughout the composition range x = 0-1. Scanning electron micrographs have shown platelet like structure in CdSe and mixed compounds where as a mixed Cubic and Hexagonal structure in ZnS. The results are explained based on different phases present in the compounds.

Characterization of Al2(WO4)3 Synthesized by Co-Precipitation Method

2014 ◽  
Vol 798-799 ◽  
pp. 85-89 ◽  
Author(s):  
E.S.G. Junior ◽  
P.M . Jardim
Keyword(s):  
Precipitation Method ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Tem Analysis ◽  
X Ray ◽  
Transmission Electron ◽  
Different Temperatures ◽  
Co Precipitation ◽  
Alpha Alumina

Al2(WO4)3was synthesized by co-precipitation using Na2WO4and Al (NO3)3as precursors. After drying the precipitate, it was calcined at different temperatures between 500°C and 800°C. The crystallization and degradation temperatures of the samples were evaluated by means of Differential Scanning Calorimetry (DSC), Thermogravimetry (TG) and X-Ray Diffraction (XRD). It was observed that the crystallization starts at around 600°C, however Transmission Electron Microscopy (TEM) analysis showed that at this temperature the sample is partially amorphous. The degradation of the material starts at around 1200°C and at 1400°C the tungsten oxide has almost completely evaporated and the material is transformed mainly in alpha-alumina.

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.

scholarly journals Synthesis and characterization of nanocrystalline nickel - cobalt ferrites by co-precipitation Method

2015 ◽  
Vol 11 (1) ◽  
Author(s):  
Ali A. Ati ◽  
Zulkafli Othaman ◽  
Shadab Dabagh ◽  
R. M. Rosnan ◽  
Samad Zare
Keyword(s):  
Spinel Ferrite ◽  
Ftir Spectrum ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Main Metal ◽  
Nano Crystalline ◽  
Xrd Patterns ◽  
Co Precipitation

Nano crystalline powders of Co-Ni ferrite compounds having the chemical formula Co(x)Ni(1-x) Fe2O4( x = 0.0, 0.2 and 1.0) have been successfully synthesized by co-precipitation technique. These synthesized compounds are characterized by X-ray diffraction (XRD), field emission scan electron microscopy (FESEM), fourier transformed infrared (FTIR) spectrum, energy dispersive X-ray diffraction (EDX) and TGA-DTA. The XRD analyses of the samples sintered at 600 °C clearly show the formation of single cubic spinel structure. XRD patterns are further analyzed to calculate the lattice constant and jump length of charge carriers. Average crystalline sizes for ferrite powders are determined from XRD line using Debye-Scherrer's formula is found to be in the range of 16 to 19 nm with narrow size distribution. The Fourier transformed infrared (FTIR) spectrum characterization of the  spinel ferrite structure sintered at 600 °C shows two fundamental strong band in the range 385-600 cm-1, which is attributed to different main metal-oxygen bands.

Characterization of Nanosize Mn-Zn Ferrites Coated with Citric Acid

2011 ◽  
Vol 391-392 ◽  
pp. 835-838
Author(s):  
Gui Xin Wang ◽  
Chun Jing Liu ◽  
Yu Meng Zhang ◽  
Hui Fen Peng ◽  
Xin Wang
Keyword(s):  
Citric Acid ◽  
Coated Sample ◽  
Precipitation Method ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zn Ferrite ◽  
Co Precipitation ◽  
Xrd And Tem

The citric-acid coated Mn-Zn ferrite nanocrystalline was prepared by an improved co-precipitation method. X-ray diffraction (XRD) and TEM measurements indicated that the coated samples were pure spinel Mn-Zn ferrite nanocrystalline and the particles coated after boiling circumfluence were more homogeneous than that before boiling circumfluence. Vibrating sample magnetometer (VSM) indicated that the Ms of the coated samples was higher than that without coating. Specially when the content of citric acid is 4.76wt% after boiling circumfluence, the Ms of the coated sample is 54.15 emu•g-1 which is 28.7% higher than that without coating.

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