Single Phase Pyrite Synthesized via Hydrothermal Method

2013 ◽  
Vol 562-565 ◽  
pp. 136-140 ◽  
Author(s):  
Zhao Tang Yang ◽  
Xiao Jiang Liu ◽  
Jing Song Liu ◽  
Xiu Li Feng
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Hydrothermal Method ◽  
Single Phase ◽  
Sem Images ◽  
X Ray ◽  
Decreasing Ph ◽  
Size And Morphology ◽  
Ph Range ◽  
Scanning Electron

Single phase pyrite has been successfully prepared via the reaction of FeSO4·7H2O, S and Na2S·9H2O using hydrothermal method. The X-ray powder diffraction measurements confirm the formation of iron disulfides in the pH range of 1-12. Marcasite is formed at pH<4, the marcasite contents in the final products increasing with decreasing pH; when the pH is higher than 4, the final product is single phase pyrite. Scanning electron microscope (SEM) images reveal that both the pH and temperatures have significant effects on the size and morphology of final products. Pyrite micro-nanocubes of 200-400nm in length were synthesized at pH=9. Detailed information of the experimental results are analyzed in the results and discussion part.

STRUCTURAL AND DILATOMETRIC PROPERTIES OF LANTHANUM-SUBSTITUTED PCT CERAMICS

2006 ◽  
Vol 20 (03) ◽  
pp. 315-323 ◽  
Author(s):  
SARABJIT SINGH ◽  
O. P. THAKUR ◽  
CHANDRA PRAKASH ◽  
K. K. RAINA
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Base Composition ◽  
Single Phase ◽  
Microstructural Analysis ◽  
Present System ◽  
X Ray Diffraction ◽  
X Ray ◽  
Shrinkage Behaviour ◽  
Scanning Electron

Pb 0.76-3x/2 La x Ca 0.24 Mn 0.02 Ti 0.98 O 3 ( PLCT ), x=0–0.08 (in steps of 0.02), ceramics were prepared by conventional mixed oxide technique. The samples were sintered at an optimized temperature of 1150°C. Phase and microstructural analysis were carried out using X-ray Diffraction (XRD) and scanning electron microscope (SEM) to study the effect of lanthanum on PCT ceramics. Both experimental and theoretical densities for all the samples were also determined. Phase analysis shows the single-phase material with tetragonal structure and the decrease in tetragonality is observed with the increase in the amount of lanthanum in the base composition. Detailed dilatometric investigations were performed in order to study the shrinkage behaviour and dominating shrinkage mechanism in the present system.

β-Ni(OH)2 Nanospheres Synthesized via the Easy Hydrothermal Method

2012 ◽  
Vol 510 ◽  
pp. 575-578
Author(s):  
Xiao Ming Fu
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Hydrothermal Method ◽  
Reaction Temperature ◽  
Nickel Nitrate ◽  
X Ray Diffraction ◽  
Ammonia Water ◽  
X Ray ◽  
Scanning Electron

β-Ni (OH)2nanospheres have been successfully synthesized with nickel nitrate as nickel source and stronger ammonia water as precipitant by the hydrothermal method. The phase and the morphologies of the samples have been characterized and analyzed by X-ray diffraction (XRD) and Scanning electron microscope (SEM). XRD shows that the phase of the samples isβ-Ni (OH)2. SEM confirms that the increase of the reaction temperature is propitious to the synthesis ofβ-Ni (OH)2nanospheres, which are synthesized at at 180 °C for 48 h with pH=9 by the hydrothermal method.

scholarly journals The Effect of ZnO Addition on Microstructure, Phase and Color Developments of Copper Reduction Glaze

10.30544/99 ◽  
2015 ◽  
Vol 21 (2) ◽  
pp. 89-100
Author(s):  
N. NayebPashaee ◽  
A.M. Aarabi ◽  
H. Sarpoolaky ◽  
H. Vafaeenezhad
Keyword(s):  
Zinc Oxide ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Electron Dispersive Spectroscopy ◽  
X Ray ◽  
Crystalline Structures ◽  
Metallic Particles ◽  
Scanning Electron

In this research, the effects of Zn on microstructure and color developments of the copper reduction glaze were investigated. Structural and colorimetric characteristics of the glaze surface are examined by X-ray diffraction, scanning electron microscope (SEM) equipped with electron dispersive spectroscopy (EDS) and Telespectrophotometery. Results indicate in samples consisted of more than 7 % of zinc amount, crystalline structures containing Willemite and synthesized copper. XRD indicate that, 14 wt% of zinc oxide is enough to form Willemite. In all samples, duration of process was sufficient to form the metallic particles. SEM images confirm presence of copper nanosphere-laths of Willemite and surrounding glaze.

Description of Ore Particles from X-Ray Microtomography (XMT) Images, Supported by Scanning Electron Microscope (SEM)-Based Image Analysis

2018 ◽  
Vol 24 (5) ◽  
pp. 461-470 ◽  
Author(s):  
Orkun Furat ◽  
Thomas Leißner ◽  
Ralf Ditscherlein ◽  
Ondřej Šedivý ◽  
Matthias Weber ◽  
...  
Keyword(s):  
Image Analysis ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Three Dimensional ◽  
Mineralogical Composition ◽  
Particle Systems ◽  
3D Image ◽  
Sem Images ◽  
X Ray ◽  
Scanning Electron

AbstractIn this paper, three-dimensional (3D) image data of ore particle systems is investigated. By combining X-ray microtomography with scanning electron microscope (SEM)-based image analysis, additional information about the mineralogical composition from certain planar sections can be gained. For the analysis of tomographic images of particle systems the extraction of single particles is essential. This is performed with a marker-based watershed algorithm and a post-processing step utilizing a neural network to reduce oversegmentation. The results are validated by comparing the 3D particle-wise segmentation empirically with 2D SEM images, which have been obtained with a different imaging process and segmentation algorithm. Finally, a stereological application is shown, in which planar SEM images are embedded into the tomographic 3D image. This allows the estimation of local X-ray attenuation coefficients, which are material-specific quantities, in the entire tomographic image.

CuO Microspheres Synthesized via the Easy Hydrothermal Method

2012 ◽  
Vol 159 ◽  
pp. 84-87
Author(s):  
Xiao Ming Fu
Keyword(s):  
Electron Microscope ◽  
Reaction Time ◽  
Scanning Electron Microscope ◽  
Hydrothermal Method ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cuo Microspheres ◽  
Scanning Electron

CuO microspheres are successfully synthesized with CuCl2 as copper source and Na2CO3 as auxiliary salt at 240 °C for 24 h via the easy hydrothermal method. The phase and the morphologies of the samples have been characterized and analyzed by XRD (X-ray diffraction) and SEM (Scanning electron microscope), respectively. XRD analysis shows that the phase of as obtained samples is CuO. SEM analysis confirms that the increase of the reaction time, the reaction temperature and the auxiliary salt is propitious to synthesize CuO microspheres.

Synthesis of CuO Flower-Nanostructure via the Hydrothermal Method

2013 ◽  
Vol 873 ◽  
pp. 131-134
Author(s):  
Xiao Ming Fu ◽  
Jie Ren
Keyword(s):  
Electron Microscope ◽  
Reaction Time ◽  
Scanning Electron Microscope ◽  
Hydrothermal Method ◽  
Reaction Temperature ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

CuO flower-nanostructures are successfully synthesized with CuCl2 as copper source and Na2CO3 as auxiliary salt at 180 °C for 24 h via the simple hydrothermal method. The phase and the morphologies of the samples have been characterized and analyzed by XRD (X-ray diffraction) and SEM (Scanning electron microscope), respectively. XRD analysis shows that the phase of as obtained samples is CuO. SEM analysis confirms that the increase of the reaction temperature is propitious to synthesize CuO flower-nanostructures while the increase of the reaction time is not in favor of their synthesis. The influence of the increase of the auxiliary salt on the morphology of CuO flower-nanostructures is not remarkable. The mechanism of the formation of CuO flower-nanostructure is discussed.

scholarly journals Synthesis and structural study of multiferroics in the Gd x Bi 1−x Cr 0.5 Fe 0.5 O 3 system (x=0.1, 0.2, 0.5)

2020 ◽  
Vol 130 (1) ◽  
pp. 81-87
Author(s):  
M.M. Mataev ◽  
◽  
N.B. Abisheva ◽  
Zh.Y. Tupsinova ◽  
M.R. Abdraymova ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Nitric Acid ◽  
Scanning Electron Microscope ◽  
Phase Analysis ◽  
Structural Study ◽  
Single Phase ◽  
Synthesis Method ◽  
X Ray ◽  
Scanning Electron

The synthesis of compounds was carring out in the system of gadolinium chromite - ferrites doped with bismuth. The citrate-nitrate method was chosen as the synthesis method. An X-ray phase analysis was performed to study the formation of new phases. Based on the results of x-ray phase analysis, it was determined that the obtained compounds in the chromiteferrite system are crystallized in orthorhombic syngony with the Pbnm(62) spatial group. It is showing that when nitric acid is using as a precipitator, can be obtaining single-phase powders. In addition, the structure and parameters of elementary cells of synthesized chromite - ferrites were determining by x-ray phase analysis. The shapes and sizes of the resulting manganite powders determined by electron microscopy. According to the results of the scanning electron microscope, the powders of synthesized chromite-ferrites consist of crystals from 184.3 nm to 3.02 microns.

scholarly journals REVO4 (RE=La, Pr, Nd) nanocrystals: Synthesis and investigation of photocatalytic degradation of some dyes

2021 ◽  
Vol 10 (3) ◽  
pp. 82-86
Author(s):  
Hai Nguyen Van ◽  
Huong Nguyen Thi
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Hydrothermal Method ◽  
Organic Dyes ◽  
X Ray Diffraction ◽  
X Ray ◽  
Photocatalytic Activities ◽  
Scanning Electron

In this, work, a series of REVO4 (RE = La, Pr, Nd) nanoparticles were successfully fabricated by the hydrothermal method. The as-synthesized REVO4 nanoparticles were characterized by various techniques of X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDX). The photocatalytic activities of obtained products were investigated by photodegradation of moderacid red RS and direct yellow GX under visible light. The NdVO4 photocatalyst showed higher discoloration of organic dyes than LaVO4 and PrVO4. About 64% moderacid red RS was degraded within 150 minutes catalyzed by the catalyst NdVO4.

X-ray micro tomography in the scanning electron microscope

1978 ◽  
Vol 36 (1) ◽  
pp. 106-107 ◽  
Author(s):  
W. Brünger
Keyword(s):  
Electron Beam ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Target Surface ◽  
The Body ◽  
X Rays ◽  
Cross Sectional ◽  
X Ray ◽  
Micro Tomography ◽  
Scanning Electron

Reconstructive tomography is a new technique in diagnostic radiology for imaging cross-sectional planes of the human body /1/. A collimated beam of X-rays is scanned through a thin slice of the body and the transmitted intensity is recorded by a detector giving a linear shadow graph or projection (see fig. 1). Many of these projections at different angles are used to reconstruct the body-layer, usually with the aid of a computer. The picture element size of present tomographic scanners is approximately 1.1 mm2.Micro tomography can be realized using the very fine X-ray source generated by the focused electron beam of a scanning electron microscope (see fig. 2). The translation of the X-ray source is done by a line scan of the electron beam on a polished target surface /2/. Projections at different angles are produced by rotating the object.During the registration of a single scan the electron beam is deflected in one direction only, while both deflections are operating in the display tube.

PHAX-SCAN: Functional integration of a Scanning Electron Microscope and an energy-dispersive x-ray analyser

1989 ◽  
Vol 47 ◽  
pp. 56-57
Author(s):  
Marc H. Peeters ◽  
Max T. Otten
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
High Speed ◽  
High Performance ◽  
Functional Integration ◽  
Energy Dispersive ◽  
X Rays ◽  
X Ray ◽  
High Speed Analysis ◽  
Scanning Electron

Over the past decades, the combination of energy-dispersive analysis of X-rays and scanning electron microscopy has proved to be a powerful tool for fast and reliable elemental characterization of a large variety of specimens. The technique has evolved rapidly from a purely qualitative characterization method to a reliable quantitative way of analysis. In the last 5 years, an increasing need for automation is observed, whereby energy-dispersive analysers control the beam and stage movement of the scanning electron microscope in order to collect digital X-ray images and perform unattended point analysis over multiple locations.The Philips High-speed Analysis of X-rays system (PHAX-Scan) makes use of the high performance dual-processor structure of the EDAX PV9900 analyser and the databus structure of the Philips series 500 scanning electron microscope to provide a highly automated, user-friendly and extremely fast microanalysis system. The software that runs on the hardware described above was specifically designed to provide the ultimate attainable speed on the system.

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