Superconducting and Electrical Resistivity of HTS Bi-2223 Doped by (Cr2O3:SnO)x Nanoparticles

2020 ◽  
Vol 1008 ◽  
pp. 104-113
Author(s):  
Huda Khalil ◽  
Abdelhady Kashyout ◽  
Osama Hemeda ◽  
Talaat Meaz
Keyword(s):  
Electrical Resistivity ◽  
Large Scale ◽  
High Temperature Superconductors ◽  
Resistivity Measurement ◽  
Chemical Properties ◽  
X Ray Diffraction ◽  
Solid State Reaction Technique ◽  
X Ray ◽  
Physico Chemical ◽  
Scanning Electron

The addition of metal nanoparticles in the Bi-based superconductors has shown the disorder produced by the cations incorporation in the crystal structure affects the TC (Critical temperature) of the system. the addition of new mixture of (Cr2O3: SnO)x on high temperature superconductors HTS Bi1.6Pb0.4 Sr2Ca2Cu3O10+δ (Bi-2223) with ratio 1:1 where x = 0.0, 0.05, 0.10, 0.15 and 0.20 was investigated by solid-state reaction technique was used to prepare superconductor samples. Samples were characterized by X-Ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FS-EM), Energy Dispersive X-ray (EDX), and electrical resistivity. the results of XRD proved that the structure of 2223 remains the same even with the addition of (Cr2O3: SnO)x nanoparticles. The phase 2223 has the majority even phase Bi-2212 and phase Ca2PbO4 showed a contribution inside structure. As a result of the change physico-chemical properties resistivity of the doped optimized sample x = 0.10 was increasing 2.2 K approximately rather than the undoped one then decreased gradually up to x = 0.20. From resistivity measurement, the TC of 2223 doped with (Cr2O3: SnO)x at x = 0.10 was 113.2 K approximately. The addition of metal oxides in superconductor materials has been considered to be one of the most promising materials for large scale applications in superconducting industry.

Magnetization of aminated lignin and characterization

TAPPI Journal ◽  
2019 ◽  
Vol 18 (01) ◽  
pp. 21-27 ◽  
Author(s):  
Xueqing Qiu ◽  
Yingzhi Ma ◽  
Dafeng Zheng
Keyword(s):  
Fourier Transform ◽  
Photoelectron Spectroscopy ◽  
Chemical Properties ◽  
Total Pore Volume ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Physico Chemical ◽  
Bet Method ◽  
Scanning Electron

A magnetic lignin-based nanomaterial (MLN) was prepared from alkaline lignin through an amination and precipitation strategy and characterized with Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TG), Brunauer-Emmett-Teller (BET) method, scanning electron microscope (SEM), dynamic light scattering (DLS), and vibrating sample magnetometer (VSM). The results illustrated that MLN was thermostable and had an extensive degree of aminated lignin coating. The specific surface area of MLN was 65.43 m2/g, with the total pore volume of 0.311 cm3/g. The zeta potential of MLN was positive when pH was less than 2.9, and the saturation magnetization was 50.8 emu/g. The characterization data discovered that the physico-chemical properties of MLN were helpful for the adsorption application.

Physico-Chemical and Morphological Changes of Sayong Kaolinite Clay Treated with Sulphuric Acid for Enzyme Immobilization

2013 ◽  
Vol 832 ◽  
pp. 589-595 ◽  
Author(s):  
N.A. Edama ◽  
A. Sulaiman ◽  
K.H. Ku Hamid ◽  
M.N. Muhd Rodhi ◽  
Mohibah Musa ◽  
...  
Keyword(s):  
Surface Area ◽  
Sulphuric Acid ◽  
Enzyme Immobilization ◽  
Morphological Changes ◽  
Chemical Properties ◽  
X Ray Diffraction ◽  
Kaolinite Clay ◽  
X Ray ◽  
Mineral Oxides ◽  
Physico Chemical

This study analyzed the effects of sulphuric acid (H2SO4) treatment on pysico-chemical properties and morphological changes of clay obtained from Sg. Sayong, Perak. The clay was ground and sieved to <150μm and treated with different concentrations of H2SO4. The treatment was completed by refluxing the clay with different concentration of H2SO4 (1M, 5M and 10M ) at 100 °C for 4 hours and followed by calcination at 500 °C for 1 hour. The physic-chemical properties and morphological changes of the untreated and treated clay were compared using Surface Area Analyser, X-Ray Diffraction (XRD), Field Emission Scanning Electron Micrograph (FESEM), X-Ray Diffraction (XRD) and Fourier Transformed Infrared Spectroscopy (FTIR). The results showed that acid treatment of 5M increased the surface area from 25 m2/g to 75 m2/g and the pore volume increased from 0.1518 cc/g to 0.3546 cc/g. The nanopore size of the clay decreased from 24.8 nm to 19.4 nm after treated with acid. This can be explained due to the elimination of the exchangeable cations and generation of microporosity. The results of XRF showed SiO2 increased from 58.34% to 74.52% and Al2O3 reduced from 34.6% to 18.31%. The mineral oxides such as Fe2O3, MgO, CaO, K2O and TiO2 also reduced. This concluded that H2SO4 treatment has led to significant removal of octahedral Al3+, Fe3+ cations and other impurities. In conclusion, this study showed the physico-chemical properties and morphology of Sayong clay were improved once treated with H2SO4 and therefore suggests better supporting material for enzyme immobilization.

scholarly journals Effect of TiO2 Addition on Mortars: Characterization and Photoactivity

2019 ◽  
Vol 9 (13) ◽  
pp. 2598 ◽  
Author(s):  
M. J. Hernández-Rodríguez ◽  
R. Santana Rodríguez ◽  
R. Darias ◽  
O. González Díaz ◽  
J. M. Pérez Luzardo ◽  
...  
Keyword(s):  
Mercury Porosimetry ◽  
Setting Time ◽  
Chemical Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Physico Chemical ◽  
Setting Process ◽  
Flow Table ◽  
Negative Effect ◽  
Important Activity

In this study, mortar specimens were prepared with a cement:sand:water ratio of 1:3:0.5, in accordance with standard EN196-1. Portland CEM I 52.5 R grey (G) and white (W) cements were used, together with normalised sand and distilled water. Different amounts of TiO2 photocatalyst were incorporated in the preparation of the mortar samples. The effect of the addition of TiO2 was studied on mechanical properties of the mortar and cement including compressive and flexural strength, consistency (the flow table test), setting time and carbonation. Characterization techniques, including thermogravimetry, mercury porosimetry and X-ray diffraction spectroscopy (XRD), were applied to study the physico-chemical properties of the mortars. It was shown that adding the photocatalyst to the mortar had no negative effect on its properties and could be used to accelerate the setting process. Specimen photoactivity with the incorporated photocatalyst was tested for NOx oxidation in different conditions of humidity (0% RH and 65% RH) and illumination (Vis or Vis/UV), with the results showing an important activity even under Vis radiation.

scholarly journals Synthesis and characterization of graphene oxide flakes for transparent thin films

2021 ◽  
Vol 22 (3) ◽  
pp. 595-601
Author(s):  
R.G. Abaszade ◽  
S.A. Mamedova ◽  
F.G. Agayev ◽  
S.I. Budzulyak ◽  
O.A. Kapush ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Graphene Oxide ◽  
Indium Tin Oxide ◽  
Electromagnetic Interference ◽  
Large Scale ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Scanning Electron

We have synthesized large scale, thin, transparent graphene oxide (GO) flakes by Hummer’s method and investigated their suitability for fabrication of transparent nanocomposites. The GO flakes were comprehensively characterized by X-ray diffraction, Scanning Electron Microscopy (SEM), Energy Dispersive X-ray analysis (EDX), Raman spectroscopy and Differential Scanning Calorimetry (DSC). X-ray diffraction displayed the peak of graphene oxide at 9°degree, which is characteristic peak of GO in agreement with the literature results. Scanning Electron Microscopy images revealed that thin, transparent, flake form GO with 14,8 µm lateral size and 0,31µm thickness were synthesized. The comparison with literature results show that for the first time, our group could synthesize large scale, thin and more transparent GO flakes by simple Hummer’s method using simple dispersed graphite. EDX measurements indicate the formation of layered structure with oxygen containing functional groups. The intensity ratio between D and G peaks in the Raman spectra proves that less defective GO flakes have been synthesized. The solution ability of the synthesized material indicate that high quality GO flakes were synthesized, which make them effective soluble material due to oxygen containing groups formed on the graphene plane during synthesis process.DSC results shows that these flakes are thermally stable till 200°C.  Due to high solubility properties, large scale and transparency they can be very useful in fabrication of high optical transparent nanocompoties for replacement indium tin oxide transparent conductors in solar panels, biomedical applications and microwave absorbers for electromagnetic interference (EMI) environmental protection.

Fabrication and Characterization of Bi1.6Pb0.4Sr2Ca2Cu3-xFexOy Superconductor

2017 ◽  
Vol 268 ◽  
pp. 311-314 ◽  
Author(s):  
M.A. Suazlina ◽  
H. Azhan ◽  
S. Akmal Syamsyir ◽  
K. Azman ◽  
W.A.W. Razali ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Undoped Sample ◽  
Fe Doping ◽  
X Ray Diffraction ◽  
Solid State Reaction Technique ◽  
X Ray ◽  
Oxide Powders ◽  
Fabrication And Characterization ◽  
Scanning Electron

This paper reports the properties of Bi-2223 superconductors that had been doped with Fe2O3 at Cu-site of the system. It was prepared in bulk form using high purity oxide powders via solid state reaction technique with intermediate grinding. A series of x = 0.00, 0.02, 0.04, 0.06, 0.08 and 0.10 of Fe were stoichiometrically added to the well balanced of Bi1.6Pb0.4Sr2Ca2Cu3-xFexOy in order to trace the effect of Fe doping. Hence, electrical resistivity, X-ray diffraction and Field Emission Scanning Electron Microscopy have been carried out to assess the effects of Fe doping. These measurements indicate that Fe doping decreased the critical temperature and degrade the formation of high Tc phase compared with the undoped sample. The orthorhombicity parameters were increased due to substitution of Cu 3+ ion by Fe 2+ ion.

One pot and large-scale synthesis of nanostructured metal sulfides: Synergistic effect on supercapacitor performance

2020 ◽  
Vol 31 (8) ◽  
pp. 1367-1384 ◽  
Author(s):  
C Karthikeyan ◽  
R Dhilip Kumar ◽  
J Anandha Raj ◽  
S Karuppuchamy
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Synergistic Effect ◽  
Large Scale ◽  
Electrochemical Impedance ◽  
Metal Sulfides ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Metal sulfides received key interest as an electrode material for storage and conversion of energy. Here, the novel nanostructured N17S18 and (CoNi)3S4 materials were synthesized via one-step hydrothermal method, and the synergistic effect of metal ions and electrochemical properties was investigated. A new and simple solution growth technique was employed in this work. The prepared nanopowders were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy techniques. The X-ray diffraction analysis of the prepared nanopowder revealed the formation of cubic phase cobalt nickel sulfides (CoNi)3S4 and hexagonal phase nickel sulfides (Ni17S18). Scanning electron microscopy analysis display fibrous, flakes and sheet-like morphology for CoxSx, N17S18 and (CoNi)3S4, respectively. Fibrous and sheet-like morphology exhibits higher electrochemical performance in supercapacitors. The electrochemical behavior of the amorphous CoxSx, crystallite Ni17S18 and (CoNi)3S4 modified electrodes was investigated using electrochemical impedance spectroscopy, cyclic voltammetry and galvanostatic charge–discharge techniques. The specific capacitance of 57 F/g and 31 F/g were obtained for the amorphous CoxSx and crystalline (CoNi)3S4 powder, respectively. Amorphous CoxSx modified electrode retains 76% of initial capacitance after 1000 repeated cycling process. These results of this study suggest that the CoxSx and crystalline (CoNi)3S4 are appropriate materials for supercapacitor applications.

Transformation Behavior of a Ti-Ni-Cu-Fe Alloy

2004 ◽  
Vol 449-452 ◽  
pp. 185-188 ◽  
Author(s):  
Tae Hyun Nam ◽  
Tae Yeon Kim ◽  
Ji Soon Kim ◽  
Seung Baik Kang
Keyword(s):  
Differential Scanning Calorimetry ◽  
Electrical Resistivity ◽  
Resistivity Measurement ◽  
Electrical Resistivity Measurement ◽  
X Ray Diffraction ◽  
Transformation Behavior ◽  
Scanning Calorimetry ◽  
X Ray

Transformation behavior of a Ti-43.0Ni-5.0Cu-2.0Fe(at%) alloy has been investigated by means of electrical resistivity measurement, differential scanning calorimetry and X-ray diffraction. The alloy transformed in three-stage during each cooling and heating procedure. That is, the B2-R-B19-B19' on cooling and the B19'-B19-R-B2 on heating.

LARGE-SCALE SYNTHESIS OF UNIFORM SILVER BROMIDE NANOWIRES USING ION TRACK MEMBRANE AS TEMPLATE

2010 ◽  
Vol 03 (04) ◽  
pp. 259-262
Author(s):  
SANJEEV KUMAR ◽  
VIJAY KUMAR
Keyword(s):  
Large Scale ◽  
Optical Band Gap ◽  
Track Membrane ◽  
Silver Bromide ◽  
X Ray Diffraction ◽  
X Ray ◽  
Xrd Study ◽  
Simple Chemical ◽  
Edxrf Technique ◽  
Scanning Electron

Silver bromide (AgBr) nanowires were grown in the pores of ion track membrane. Simple chemical reaction technique was used where pores in the membrane act as reactors. Uniform morphology of nanowires was found using scanning electron microscopy (SEM). An X-ray diffraction (XRD) study shows the crystalline structure. Energy dispersive X-ray fluorescence (EDXRF) technique was used to study the composition of AgBr nanowires. Optical band gap of AgBr nanowires determined using absorption spectra was found to be higher than the bulk.

From Layered Ni(OH)2 Thin Films to Ni(so4)0.3(OH)1.4 Nanobelts through so42- Inserting in Colloid-Based Route

2011 ◽  
Vol 295-297 ◽  
pp. 1548-1553
Author(s):  
Zhi Yong Jia
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Large Scale ◽  
Ph Value ◽  
Shape Evolution ◽  
X Ray Diffraction ◽  
Weak Base ◽  
X Ray ◽  
Ft Ir ◽  
Scanning Electron

The single-crystalline nanobelts of monoclinic Ni(SO4)0.3(OH)1.4have been synthesized on a large scale through a convenient, low-temperature hydrothermal method. The influences of reaction time, pH value, concentration of ammonia on the phase and shape evolution of nanobelts were systematically investigated. It was found that the initial layered Ni(OH)2 thin films as intermediates could be split and converted into the monoclinic Ni(SO4)0.3(OH)1.4nanobelts through SO42-ions inserting process. The formation mechanism of nanobelts involved in the inserting process and the corresponding drive force have been investigated in detail by means of X-ray diffraction (XRD), and scanning electron microscopy (SEM), FT-IR spectra and pH value analyses. In addition to, we have also found that the ammonia molecules acted as both weak base and ligand agent was crucial to the controlling nucleation and inserting process in the formation process of nanobelts.

Catagenesis in shales and occurrence of authigenic clays in sandstones, North Sabine H-49 well, Canadian Arctic Islands

1979 ◽  
Vol 16 (6) ◽  
pp. 1309-1314 ◽  
Author(s):  
A. E. Foscolos ◽  
T. G. Powell
Keyword(s):  
Electron Microscopy ◽  
Canadian Arctic ◽  
Burial Depth ◽  
X Ray Diffraction ◽  
X Ray ◽  
The North ◽  
Physico Chemical ◽  
Sverdrup Basin ◽  
Chemical Conditions ◽  
Scanning Electron

Authigenic clays in eight sandstone samples from the North Sabine H-49 well in the Sverdrup Basin, N.W.T., have been studied by X-ray diffraction and scanning electron microscopy. The following sequence of authigenic minerals was observed with increasing burial depth: quartz–kaolinite, illitic 2:1 layer silicates, and chlorite. It is suggested that the formation of authigenic clays in sandstones can be considered in the context and as a product of catagenesis of adjacent shales. Upon burial, water is released from the shales by compaction, clay dehydration, and clay destruction. Continuing compaction carries the products of clay transformation to the sandstones where they precipitate to form authigenic clays. The nature of the authigenic clay is directly related to the physico-chemical conditions existing at various depths.

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