scholarly journals In-Situ Manufacturing of SiC-Doped MgB2 Used for Superconducting Wire

2021 ◽  
Vol 45 (2) ◽  
pp. 175-179
Author(s):  
Satrio Herbirowo ◽  
Agung Imaduddin ◽  
Hendrik ◽  
Andika Widya Pramono ◽  
Sunardi ◽  
...  
Keyword(s):  
Critical Temperature ◽  
Magnesium Diboride ◽  
Morphological Characteristics ◽  
X Ray ◽  
Stainless Steel 304 ◽  
Mgb2 Wire ◽  
Carbon Substitution ◽  
Doped Mgb2 ◽  
Powder In Tube

Magnesium diboride (MgB2) is a highly potential superconducting material, in substitution of Nb3Sn, which has a critical temperature of ~ 39 K. This synthesis and manufacturing of MgB2 wire were conducted by in-situ powder in tube (PIT). The method doped with silicon carbide (SiC) was aimed to study the effect of phase formation on carbon substitution and morphological characteristics with the motivation to improve superconductivity properties. Magnesium, boron, and SiC powders were synthesized and functionally processed with stainless Steel 304 tube. Heat treatment was conducted at 750℃, 800℃, and 850℃ for 2 hours followed by furnace cooling. Characterization was carried out by x-ray diffractometer (XRD), scanning electron microscopy (SEM), and cryogenic magnet testing. The results showed that 1% SiC optimally increased the zero critical temperature of MgB2 ~ 37.18 K along with the sintering at 750℃ for 2 hours.

Novel Composite of Nano-Sized SiO2/Chitosan Induce the Growth of HAp Crystal

2007 ◽  
Vol 361-363 ◽  
pp. 483-486
Author(s):  
Shao Wei Huang ◽  
Xu Dong Wang ◽  
Weng Juan Zhang ◽  
Chang Lu ◽  
Zhi Hong Zhu ◽  
...  
Keyword(s):  
Morphological Characteristics ◽  
Chitosan Film ◽  
X Ray Diffraction ◽  
X Ray ◽  
Simulate Body Fluid ◽  
Nucleation Sites ◽  
Initial Nucleation ◽  
Biomimetic Approach ◽  
Sbf Solution

A novel hybrid material of chitosan/nano-sized SiO2/hydroxyapatite (HAp) composite was prepared through a biomimetic approach. HAp deposited in situ on the surface of chitosan/ nano-sized SiO2 composite film in simulate body fluid (SBF) solution at 36.5°C. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) were performed to study composition and morphological characteristics of the HAp crystal. The results indicated that nano-sized SiO2 dispersed in the chitosan film provided initial nucleation sites for the growth of the HAp in SBF solution by adsorbing further PO4 3−, Ca2+ due to the induction of HAp formed. The strength of the composite was largely improved because of the addition of nano-sized SiO2.

Fabrication of the 19-filament Fe/Cu clad MgB2 wire via in situ powder-in-tube method

2007 ◽  
Vol 52 (19) ◽  
pp. 2621-2625 ◽  
Author(s):  
ZhengGuang Yu ◽  
YanWei Ma ◽  
DongLiang Wang ◽  
ZhaoShun Gao ◽  
XianPing Zhang
Keyword(s):  
Mgb2 Wire ◽  
Powder In Tube

SOME ASPECTS OF MATERIAL PREPARATION IN MAGNESIUM DIBORIDE: THIN FILMS GROWTH AND TAPES FABRICATION

2003 ◽  
Vol 17 (04n06) ◽  
pp. 400-406
Author(s):  
C. FERDEGHINI ◽  
V. BRACCINI ◽  
E. BELLINGERI ◽  
M. R. CIMBERLE ◽  
V. FERRANDO ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnesium Diboride ◽  
Low Cost ◽  
Thin Film Deposition ◽  
Single Step ◽  
Film Deposition ◽  
Material Preparation ◽  
Powder In Tube ◽  
Deposition Techniques

In this paper a short description of the problems related to the preparation of magnesium diboride samples in form of bulk, thin films and tapes is given. The principal problem is that MG is highly volatile: this fact imposes severe constraints to the sample preparatation. We briefly review the activity in this field of the INFM-LAMIA laboratory. A method has been developed to prepare very clean and dense bulk samples with good transport properties in a single step, starting from pure elements. In the tapes fabrication, very promising results are obtained with a powder in tube procedure: the low cost and the good results obtained in term of critical current density make this compound interesting for the applications. The various thin film deposition techniques developed will be also shortly reviewed with particular regard to the in situ ones.

scholarly journals Insights into the Photocatalytic Bacterial Inactivation by Flower-Like Bi2WO6 under Solar or Visible Light, Through in Situ Monitoring and Determination of Reactive Oxygen Species (ROS)

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1099 ◽  
Author(s):  
Minoo Karbasi ◽  
Fathallah Karimzadeh ◽  
Keyvan Raeissi ◽  
Sami Rtimi ◽  
John Kiwi ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Visible Light ◽  
Morphological Characteristics ◽  
Reactive Oxygen ◽  
In Situ Monitoring ◽  
Inactivation Kinetics ◽  
Oxygen Species ◽  
Bacterial Inactivation ◽  
X Ray

This study addresses the visible light-induced bacterial inactivation kinetics over a Bi2WO6 synthesized catalyst. The systematic investigation was undertaken with Bi2WO6 prepared by the complexation of Bi with acetic acid (carboxylate) leading to a flower-like morphology. The characterization of the as-prepared Bi2WO6 was carried out by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), specific surface area (SSA), and photoluminescence (PL). Under low intensity solar light (<48 mW/cm2), complete bacterial inactivation was achieved within two hours in the presence of the flower-like Bi2WO6, while under visible light, the synthesized catalyst performed better than commercial TiO2. The in situ interfacial charge transfer and local pH changes between Bi2WO6 and bacteria were monitored during the bacterial inactivation. Furthermore, the reactive oxygen species (ROS) were identified during Escherichia coli inactivation mediated by appropriate scavengers. The ROS tests alongside the morphological characteristics allowed the proposition of the mechanism for bacterial inactivation. Finally, recycling of the catalyst confirmed the stable nature of the catalyst presented in this study.

Kinetics of the alignment and the formation of the Bi(2223) platelets in the powder-in-tube processed Bi(2223)/Ag composite tapes

1997 ◽  
Vol 12 (11) ◽  
pp. 3055-3073 ◽  
Author(s):  
Li-jun Wu ◽  
Y-L. Wang ◽  
Weimin Bian ◽  
Yimei Zhu ◽  
T. R. Thurston ◽  
...  
Keyword(s):  
Microstructural Characterization ◽  
Processing Technique ◽  
Phase Assemblage ◽  
X Ray Diffraction ◽  
X Ray ◽  
Alignment Process ◽  
Precursor Powders ◽  
Kinetics Of ◽  
Powder In Tube

The alignment and the formation of (Bi, Pb)2Sr2Ca2Cu3O10 inside an Ag sheath were investigated for tapes from four different precursor powders. Microstructural characterization along with in situ transmission x-ray diffraction experiments revealed that the kinetics depended strongly on the processing technique and the phase assemblage of the precursors. The alignment process was governed by the preferential grain growth of the Bi-cuprates along the a-b plane and the constraint applied by the sheath. The formation mechanism of (Bi, Pb)2Sr2Ca2Cu3O10 was either the intercalation or the nucleation and growth, depending on whether excessive liquid is adjacent to the platelets.

scholarly journals Experimental Study on the Phase Formation of MgxB2 (x=0.8, 1.0, 1.2)

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
Mohd Faizal Mohd Aris
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Phase Formation ◽  
Annealing Temperature ◽  
Magnesium Diboride ◽  
Secondary Phase ◽  
X Ray ◽  
Microscopy Images ◽  
Scanning Electron

Phase formation of Magnesium diboride MgxB2 (x=0.8, 1.0, 1.2) by in situ reaction of Magnesium (Mg) and Boron (B) at different annealing temperature by varying the nominal Mg composition was compared. The X-ray difffraction pattern indicates that Magnesium Oxide (MgO) is the major secondary phase. Some unreacted Mg was found for nominally stoichiometric and Mg excess samples annealed at or below 750°C. However, no unreacted Mg was detected by XRD for Mg deficient samples. Scanning Electron microscopy images show the porous nature of synthesised samples.

scholarly journals Thermal And Kinetic Study of Electrochemical Deposition of Lead On FTO Substrate

2021 ◽  
Author(s):  
Ridha Hamdi ◽  
Amani Rached ◽  
Amor Saidi BEN Ali
Keyword(s):  
Electrochemical Deposition ◽  
Tin Oxide ◽  
Morphological Characteristics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fixed Concentration ◽  
Constant Potential ◽  
Nitrate Bath ◽  
Potential Conditions

Abstract We report the electrochemical deposition of lead (Pb) onto fluorine-doped tin oxide (FTO) electrodes in a sodium nitrate bath (0.4M NaNO3) at constant potential conditions. The kinetics electrodeposition processes have been in situ monitored for advanced nucleation stages by chronoamperometry for various temperature at fixed concentration of Pb2+, that is 0.1M. The microstructure and morphological characteristics of the deposit layers were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-Ray EDX techniques. The results show that the current density as well as the deposits density strongly depend on the temperature. The correlation between the experimental results and the theoretical process of the lead deposits was discussed and verified.

The Use of Advanced Analytical Techniques for Characterization of the Chemical, Physical, and Crystallographic Nature of a Surface

1973 ◽  
Vol 31 ◽  
pp. 132-133 ◽  
Author(s):  
R. E. Herfert
Keyword(s):  
Surface Characterization ◽  
Analytical Techniques ◽  
X Ray Diffraction ◽  
Depth Of Penetration ◽  
X Ray ◽  
The Past ◽  
Transmission Electron ◽  
Scanning Electron

Studies of the nature of a surface, either metallic or nonmetallic, in the past, have been limited to the instrumentation available for these measurements. In the past, optical microscopy, replica transmission electron microscopy, electron or X-ray diffraction and optical or X-ray spectroscopy have provided the means of surface characterization. Actually, some of these techniques are not purely surface; the depth of penetration may be a few thousands of an inch. Within the last five years, instrumentation has been made available which now makes it practical for use to study the outer few 100A of layers and characterize it completely from a chemical, physical, and crystallographic standpoint. The scanning electron microscope (SEM) provides a means of viewing the surface of a material in situ to magnifications as high as 250,000X.

In Situ X-Ray Absorption Studies of the Electrochemical Reduction of Hydroxocobalamin

1997 ◽  
Vol 7 (C2) ◽  
pp. C2-619-C2-620 ◽  
Author(s):  
M. Giorgett ◽  
I. Ascone ◽  
M. Berrettoni ◽  
S. Zamponi ◽  
R. Marassi
Keyword(s):  
Electrochemical Reduction ◽  
X Ray ◽  
Absorption Studies ◽  
X Ray Absorption
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