Synthesis and Characterization of Nano-Hexaferrites SrFe12O19 by Aqueous Solution Method

2011 ◽  
Vol 306-307 ◽  
pp. 404-409 ◽  
Author(s):  
Jian An Liu ◽  
Mei Mei Zhang ◽  
Yan Fei Zhang ◽  
Shu Jiang Liu
Keyword(s):  
Aqueous Solution ◽  
Magnetic Properties ◽  
Solution Method ◽  
Nano Particles ◽  
X Ray Diffraction ◽  
Nanometer Materials ◽  
Transmission Electron ◽  
Fast Synthesis ◽  
Aqueous Solution Method

Nano-hexaferrite SrFe12O19 has been prepared using the aqueous solution method. The structure and magnetic properties of SrFe12O19 have systematically been investigated by X-ray diffraction (XRD), Thermo gravimetric (TG), Fourier transform infrared spectroscopy (FTIR), Transmission Electron Microscopy (TEM), as well as Vibrating Sample Magnetometer (VSM). The XRD and TEM results showed that the samples are composed of SrFe12O19 nano-particles which are on average 70×50nm in dimensions when treated at 1200°C for 2 hours. The magnetic properties indicated that the saturation magnetization and the intrinsic coercivity were 48 Am2/kg and 506KA/m, respectively. The aqueous solution method is generally applicable to produce the nano-hexaferrite SrFe12O19 and is proved to be a promising method for fast synthesis of nanometer materials using nitrate.

Synthesis and Characterization of Sr3MgSi2O8:Eu2+, Dy3+ Phosphor Prepared by a Chemical Solution Method

2011 ◽  
Vol 675-677 ◽  
pp. 1089-1092 ◽  
Author(s):  
Wen Pan ◽  
Ning Hui Wang ◽  
Guo Feng Li ◽  
Gui Ling Ning
Keyword(s):  
Solution Method ◽  
Intermediate Phase ◽  
Precursor Solution ◽  
X Ray Diffraction ◽  
Calcination Process ◽  
Chemical Solution Method ◽  
Transmission Electron ◽  
Dispersion Media ◽  
Better Than

A novel synthesis route for the production of Sr3MgSi2O8:Eu2+,Dy3+ sub-micron quasisphere phosphor powder is reported. Both the host and activator cations were co-precipitated in water-ethanol mixed solutions and precipitation was performed with analytical grade ammonium citratetribasic. As the dispersion media, optimum concentration for PEG in the precursor solution is determined to be 0.08 g/mL. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM) and fluorescence spectrophotometer were employed to characterize the phosphor. The effect of the calcining temperature on the crystalline particle and luminescence properties of Sr3MgSi2O8:Eu2+,Dy3+ is systematically discussed. Sr3MgSi2O8:Eu2+,Dy3+ single phased quasi-sphere phosphor was achieved by calcining the asprecipitated precursor at 1100°C. Sr2SiO4 was identified as the intermediate phase during the calcination process. Despite the small particle size, the emission intensities were higher by the present method. However, the afterglow characteristic was not better than that prepared by solidstate reaction in the comparable condition.

Synthesis and characterization of a Sb(v)-containing polyoxomolybdate serving as a catalyst for sulfoxidation

2018 ◽  
Vol 47 (24) ◽  
pp. 8070-8077 ◽  
Author(s):  
Jingkun Lu ◽  
Yaping Wang ◽  
Xinyi Ma ◽  
Yanjun Niu ◽  
Vikram Singh ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Solution Method ◽  
Synthesis And Characterization ◽  
Aqueous Solution Method

A Sb-containing Anderson-based polyoxomolybdate cluster, [(CH3)4N]4H8[Na5Sb3(Sb2Mo12O57)]·17H2O [1; (CH3)4N+ = TMA+], has been successfully synthesized by using an aqueous solution method and structurally characterized.

Effects of Anion on the Morphologies of ZnO Synthesized by an Aqueous Solution Method

2011 ◽  
Vol 284-286 ◽  
pp. 781-785 ◽  
Author(s):  
Shi Cai Cui ◽  
Da Feng Zhang ◽  
Xi Peng Pu ◽  
Xian Hua Qian ◽  
Tian Tian Ge ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Scanning Electron Microscopy ◽  
Zinc Sulfate ◽  
Solution Method ◽  
Nano Particles ◽  
X Ray ◽  
Zinc Salts ◽  
Aqueous Solution Method ◽  
Scanning Electron

ZnO were rapidly synthesized using different zinc salts (Zn(NO3)2, Zn(CH3CO2)2, ZnCl2and ZnSO4) by an aqueous solution method at 90°C. The products were characterized by X-ray diffractometry and scanning electron microscopy. The results show that the anions have remarkable effects on the morphologies of ZnO. When Zn(NO3)2, Zn(CH3CO2)2or ZnCl2was used, ZnO was obtained with ellipsoidal, under-developed ellipsoidal and nano-particles morphologies, respectively. In the case of ZnSO4, layered basic zinc sulfate was obtained. The remarkable effects of anions on ZnO can be ascribed to the adsorption of the anions on the surface of ZnO, which hinders the further growth of ZnO nuclei. The effect of SO42-was further investigated by changing the mole ratio of SO42-to NO3-.

Synthesis and Characterization of Surface-Grafted Magnesium Oxide Whiskers with poly(L-lactide)

2013 ◽  
Vol 820 ◽  
pp. 41-44
Author(s):  
Wei Wen ◽  
Bing Hong Luo ◽  
Cai Rong Li ◽  
Wan Xu ◽  
Chang Ren Zhou
Keyword(s):  
Electron Microscope ◽  
Magnesium Oxide ◽  
Solution Method ◽  
Magnesium Carbonate ◽  
X Ray Diffraction ◽  
Vibration Absorption ◽  
Transmission Electron ◽  
Stretching Vibration ◽  
Vibration Absorption Peak

Firstly, Magnesium oxide (MgO) whiskers were prepared by calcination of magnesium carbonate (MgCO3)whiskers which were obtained by solution method. Then, surface-grafted MgO whiskers with poly (L-lactide) were synthesized by bulk ring-opening polymerization ofL-lactide onto the surface of MgO whiskers. The MgO whiskers and surface-grafted MgO whiskers were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), x-ray diffraction (XRD) and fourier transformation infrared (FTIR). Results showed that MgO whiskers diameter in the range of 0.02-0.5μm, the length is between 10-80μm and well dispersed. A new characteristic stretching vibration absorption peak of C=O apppeared in the IR spectrum of the surface-grafted MgO whiskers, which suggested that poly (L-lactide) chains were successfully grafted on the surface of MgO whiskers.

Preparation, Characterization of Co3O4 Nano-Particles and its Catalytic Effect on the Combustion of Fuel Rich Propellants

2012 ◽  
Vol 560-561 ◽  
pp. 284-288 ◽  
Author(s):  
Wei Qiang Pang ◽  
Xiao Bing Shi ◽  
Yang Li
Keyword(s):  
Particle Size ◽  
Catalytic Effect ◽  
Solid Phase ◽  
Particle Size Analysis ◽  
Nano Particles ◽  
Size Analysis ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Wide Size Distribution

The mono-dispersed Co3O4 nano-particles were prepared by means of solid phase synthetical method. The particle size, specific surface area, crystal structure and morphology of the samples were characterized by laser particle size analysis, x-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. The catalytic effects of nano-particles on the combustion of fuel rich propellant were investigated. The results show that the Co3O4 nano-particles prepared are uniform and with relatively wide size distribution curve. The catalytic effect of Co3O4 nano-particles on the fuel rich propellant is stronger than those of micro-sized Co3O4 particles and CuO nano-particles.

Structure of Fe-Based Metallic Glass after Crystallization Process

2010 ◽  
Vol 163 ◽  
pp. 165-168 ◽  
Author(s):  
Ryszard Nowosielski ◽  
Rafał Babilas ◽  
Grzegorz Dercz ◽  
Lucjan Pająk
Keyword(s):  
Magnetic Properties ◽  
Metallic Glass ◽  
Structural Changes ◽  
Crystallization Process ◽  
X Ray Diffraction ◽  
Soft Magnetic ◽  
After Effects ◽  
Transmission Electron ◽  
Saturation Induction

The work presents a crystallization process of Fe-based amorphous alloy by characterization of the influence of annealing temperature on structural changes and magnetic properties of Fe72B20Si4Nb4 metallic glass. The studies were performed on the samples in the form of ribbons and rods. Crystallization behaviour of the studied alloy was examined by X-ray diffraction (XRD) and transmission electron microscopy (TEM) methods. The studies of soft magnetic properties of tested material involved magnetic permeability, saturation induction, coercive field and magnetic after-effects measurements.

Preparation for Nano-NiO by Electrolysis of Nickel in HOCH2CH2OH Solution

2011 ◽  
Vol 399-401 ◽  
pp. 593-596
Author(s):  
Chuan Gao Zhu ◽  
Feng Wu Wang
Keyword(s):  
High Purity ◽  
Sol Gel ◽  
Nano Particles ◽  
Metal Alkoxide ◽  
Oxide Material ◽  
X Ray Diffraction ◽  
Laser Raman ◽  
Transmission Electron ◽  
Laser Raman Spectra

A method to prepare nickel oxide material which has a high purity and nano-sized particle was developed. nano NiO was synthesized by sol-gel method using nickel alkoxide as precursors. The structural characterization of the obtained materials was performed by thermal analysis TG-DTA, X-ray diffraction (XRD), Laser Raman spectra and Transmission Electron Microscopy (TEM). The characterization results indicated that NiO nano-particles (size 25–35 nm) are obtained by hydrolyzing of metal alkoxide of Ni(OCH2CH2OH)2 and possess high purity.

Synthesis and Characterization of Structure Controlled Nano-cobalt Particles

2002 ◽  
Vol 755 ◽  
Author(s):  
Shiqiang Hui ◽  
Mingzhong Wu ◽  
Shihui Ge ◽  
Dajing Yan ◽  
Y.D. Zhang ◽  
...  
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Silica Coating ◽  
Face Centered Cubic ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Average Grain Size ◽  
Wet Chemical ◽  
Face Centered

ABSTRACTNanostructured cobalt particles with and without a ceramic coating have been synthesized using a wet chemical method. The structure and magnetic properties of synthesized powder were characterized using x-ray diffraction (“XRD”), high-resolution transmission electron microscopy (“HRTEM”), and a Quantum Design (SQUID) magnetometer. The cobalt nanoparticles are of either face-centered cubic (“fcc”) and/or hexagonally close-packed (“hcp”) crystalline structures. The average grain size is ∼14 nm for cobalt (either fcc or hcp) with an amorphous silica coating, and the average grain size is ∼9 nm for hcp cobalt and 26 nm for fcc cobalt without a silica coating. The effect of annealing temperature on grain size and magnetic properties are addressed.

scholarly journals Fabrication and characterization of Si1-xGex nanocrystals in as-grown and annealed structures: A comparative study

2019 ◽  
Author(s):  
Muhammad Taha Sultan ◽  
Valentin Serban Teodorescu ◽  
Jón Tómas Guðmundsson ◽  
Andrei Manolescu ◽  
Magdalena Lidia Ciurea ◽  
...  
Keyword(s):  
Magnetron Sputtering ◽  
Self Assembly ◽  
Structural Changes ◽  
Nano Particles ◽  
Ambient Atmosphere ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Interface Characteristics ◽  
Order Of Magnitude

Multilayer structure comprising of SiO2/SiGe/SiO2 were obtained by depositing SiO2 layers using reactive direct current magnetron sputtering (dcMS), whereas, Si and Ge were co-sputtered using dcMS and high impulse power magnetron sputtering (HiPIMS), respectively. The as-grown structures subsequently underwent rapid thermal annealing (550 – 900 °C for 1 min) in N2 ambient atmosphere. The structures were investigated using X-ray diffraction, high-resolution transmission electron microscopy along with photoconductive analysis, to explore structural changes and constituent properties. It is observed that the employment of HiPIMS facilitates the formation of SiGe nano-particles (~ 2.1 ± 0.8 nm) in the as-grown structure, and that presence of such nano-particles acts as a seed for heterogeneous nucleation, which upon annealing results in formation of periodically arranged columnar self-assembly of core-shell SiGe nanocrystals. Consequently an increase in photocurrent intensity by more than an order of magnitude was achieved by the annealing. Furthermore, a detailed discussion is provided on strain development within the structures, the consequent interface characteristics and its effect on the photocurrent spectra.

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