STRUCTURAL AND ELECTRICAL PROPERTIES OF HIGH AND LOW-DENSITY Yb-DOPED Bi(Pb)-2223 SUPERCONDUCTOR

2016 ◽  
Vol 78 (6-6) ◽  
Author(s):  
H. Azhan ◽  
J. S. Hawa ◽  
C. M. N. Azura ◽  
K. Azman ◽  
S. A. Syamsyir
Keyword(s):  
Surface Area ◽  
Resistivity Measurement ◽  
High Density ◽  
Large Surface Area ◽  
Crystallographic Structure ◽  
Low Density ◽  
X Ray Diffraction ◽  
Volume Percentage ◽  
Structural And Electrical Properties ◽  
Co Precipitation

Ytterbium (Yb)-doped of Bi(Pb)-2223 with varying concentration was prepared by co-precipitation (COP) and solid state reaction (SSR) to produce high density and low density samples respectively. In this work, the samples were characterized by X-ray diffraction analysis (XRD) and resistivity measurement system. Substitution of Yb in Bi(Pb)-2223 decreased the volume percentage of 2223 phase, the length of c-parameter, TC and JC towards higher concentration of Yb. The crystallographic structure is tetragonal in a low concentration of Yb but changes to orthorhombic at higher Yb-doped. The high-density samples have a higher volume percentage of 2223 phase and critical temperature, TC for the same concentration of Yb compared to low-density samples. However, the critical current density, JC in low-density samples is higher compared to high-density samples due to the large surface area in a porous structure made by sucrose. The large surface area favors improving the grains connectivity during the sintering process. 

Effect of Ca Substitution at Y-Site of YB2C3O7 Superconductor Prepared via Co-Precipitation Method

2012 ◽  
Vol 501 ◽  
pp. 299-303 ◽  
Author(s):  
H.N. Hidayah ◽  
S.Y.S. Yahya ◽  
H. Azhan ◽  
K. Azman ◽  
J.S. Hawa ◽  
...  
Keyword(s):  
Critical Temperature ◽  
Current Density ◽  
Resistivity Measurement ◽  
Density Measurement ◽  
Precipitation Method ◽  
Crystallographic Structure ◽  
X Ray Diffraction ◽  
Ca Substitution ◽  
Co Precipitation ◽  
Critical Current Density Jc

The effect of Ca substitution in Y1-xCaxBa2Cu3O7 superconductor prepared via co-precipitation method has been investigated. The concentration of Ca substitution was varied from x = 0.05 to x = 0.20. The samples were characterized using X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (SEM), resistivity measurement and current density measurement (without magnetic field). The critical temperature of the samples decreased as the concentration of Ca be increased whereby the highest value of critical temperature (Tc zero) was 83 K at x = 0.05. The crystallographic structure of pure sample was evidenced to be orthorhombic form where a ≠ b ≠ c.. At x = 0.10, the microstructure showed an improvement in grain alignment compared to other Ca concentration. The critical current density (Jc) increased with Ca concentration. The value of Jc for x = 0.05 at 50 K and 60 K was 1.51 A/cm2 and 1.00 A/cm2, respectively.

Synthesis and Characterization of Low Density Bi-2223 Superconductors via Co-Precipitation Method

2015 ◽  
Vol 1107 ◽  
pp. 611-615 ◽  
Author(s):  
I.N. Syuhaida ◽  
H. Azhan ◽  
K. Azman ◽  
C.M.N. Azura ◽  
M. Robaiah
Keyword(s):  
Electrical Properties ◽  
Structural Properties ◽  
Precipitation Method ◽  
Crystallographic Structure ◽  
Low Density ◽  
X Ray Diffraction ◽  
Tetragonal Form ◽  
Optimum Porosity ◽  
Co Precipitation

High temperature Bi1.6Pb0.4Sr2Ca2Cu3Oδ of low density has been synthesized via co-precipitation method and its electrical and structural properties have been studied. The optimum porosity of the samples was obtained using variety amount of sucrose C12H22O11 which is used as supplementary filler. The electrical properties of superconductor such as critical temperature, Tc and critical current density, Jc were determined using the four-probe method. X-ray diffraction (XRD) was used to analyze the structural properties of the samples. The density of samples was measured using densitometer. The obtained results have revealed a significant influence of the pore presence in superconducting samples on the electrical properties. The Tc for low density Bi-2223 with 0.1g sugar sucrose is much higher compared to 0.05g, 0.15g and standard sample which is Tc zero is 98 K. The Jc for low density Bi-2223 with 0.1g sugar sucrose is 6 A/cm2 at 60 K which is higher than high density samples. The crystallographic structure remains in the tetragonal form where a=b≠c for all samples.

Electrical and Structural Properties of Ca Substitution in High and Low Density Y(Ba1-xCax)2Cu3O7-δ Superconductor

2016 ◽  
Vol 846 ◽  
pp. 586-590
Author(s):  
Azhan Hashim ◽  
Abd Wahab Norazidah ◽  
Azman Kasim ◽  
A. Nazree ◽  
S. Akmal Syamsyir ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Structural Properties ◽  
Structural Identification ◽  
Solid State Reaction Method ◽  
High Density ◽  
Crystallographic Structure ◽  
Low Density ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ca Substitution

The effect of Ca substitution on the electrical and structural properties in high and low density Y(Ba1-xCax)2Cu3Oδ where x = 0.00, 0.10, 0.20 and 0.30 via solid state reaction method has been investigated. The electrical properties, elemental analysis, and structural identification were measured by the four-point probe technique, energy dispersive x-ray (EDX) and X-ray diffraction (XRD) respectively. The electrical properties such as critical temperature (Tc) and critical current density (Jc) were found to be strongly dependent in both high and low densities Y(Ba1-xCax)2Cu3O7-δ. These parameters were decreased monotonously with the increasing of Ca substitution. An obvious results of the Ca-doped samples can be seen in x = 0.20 where Tc zero of high density sample is 77 K, which is higher than that of the low density sample that occurred at 73 K. Meanwhile, Jc at 60 K for high density is 1.842 A/cm2 compared to 1.410 A/cm2 in low density sample. EDX analysis confirmed the existence of Ca in all doped samples. The crystallographic structure remained orthorhombic and the volume of unit cell increased towards further increased of Ca concentration.

Effect of Antimony (Sb) Substitution on Ba-Site of Porous Structured YBA2Cu3Oδ Superconductor

2018 ◽  
Vol 7 (3.28) ◽  
pp. 106
Author(s):  
Fariesha Farha Ramli ◽  
Azhan Hashim
Keyword(s):  
Resistivity Measurement ◽  
Crystallographic Structure ◽  
Ybco Superconductor ◽  
Nominal Composition ◽  
X Ray Diffraction ◽  
Electron Microscopic ◽  
Metallic Behavior ◽  
Sb Doping ◽  
Sem Micrograph ◽  
High Level

The effect of antimony (Sb) substitution on Ba-site of porous structure YBa2Cu3Oδ (YBCO) superconductor was investigated. Polycrystalline sucrose was used to create the open pores in the structure. A series of sample with a nominal composition of YBa2-xSbxCu3Oδ where x = 0.05, 0.10, 0.15, 0.20, 0.30, 0.40 and 0.50 were synthesized and characterized using X-ray diffraction (XRD) method, resistivity measurement technique and Scanning Electron Microscopic (SEM) equipment. For porous Sb-doped sample with x ≤ 0.30, the samples showed metallic behavior above onset critical temperature (TC onset) while semiconducting behavior was shown for x ³ 0.40. The optimum Sb concentration was achieved at x = 0.15, where TC zero is 85 K and critical current (JC) value measured at 70 K is 2.75 A/cm2. TC onset and TC zero of the sample were suppressed towards higher Sb concentration. High level of Sb concentration resulted in the non-superconducting sample and Sb was not incorporated properly into YBCO system. Generally, the crystallographic structure with 123 phase remains as orthorhombic. But, for Sb doping at x = 0.30, the sample exhibits tetragonal structure before the presence of 211 phase with the higher Sb concentration. SEM micrograph for porous sample showed the less dense packing with irregular grain shape compared to the standard sample where the small rounded particles grains that can be clearly seen. It can be summarized that the superconducting properties were attributed mainly by the dopants compared to the porous characteristic. 

scholarly journals The Fabrication of Natural Zeolite Via Co-Precipitation Method as Cu, Pb and Zn Metal Absorbent

2020 ◽  
Vol 57 (3) ◽  
pp. 40-47
Author(s):  
M. Sirait ◽  
K.Sari Dewi Saragih ◽  
S. Gea ◽  
Keyword(s):  
Heavy Metal ◽  
Surface Area ◽  
Natural Zeolite ◽  
Total Surface Area ◽  
Precipitation Method ◽  
Natural Material ◽  
X Ray Diffraction ◽  
Test Analysis ◽  
Living Things ◽  
Co Precipitation

AbstractHeavy metal waste is very dangerous, which can change the condition of water into a solid substance that can be suspended in water and can reduce the cleanliness level of water consumed by living things. To date, heavy metals can be managed through several processes, namely physics, biology or chemistry. One of the ways to overcome heavy metal pollution is to use natural zeolite applying a co-precipitation method, as it is known that zeolite is a powerful natural material to be used for certain purposes. In order to justify the research results, several analyses have been performed, such as X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Surface Area Analyser (SAA), and Atomic Adsorption Spectrophotometric (AAS). From the XRD results, it has been found out that the size of each zeolite with variations in size of 150 mesh, 200 mesh, and 250 mesh is 29.274 nm, 38.665 nm and 43.863 nm, respectively. Moreover, the SEM-EDX has shown that the zeolite under consideration is a type of Na-Zeolite and that the co-precipitation method successfully removes impurity elements, namely, Fe, Ti, and Cl. The results of SAA testing have indicated that the total surface area for each variation of zeolite sizes is 63.23 m2/g, 45.14 m2/g and 59.76 m2/g. The results of the AAS test analysis have demonstrated that the optimal absorption of metal content is observed in a size of 150 mesh zeolite with adsorption power of 99.6 % for Pb metal, 98 % for Cu metal, and 96 % Zn metal.

Penetration of Fine Foundry Sand by Rigid Projectiles

2006 ◽  
Author(s):  
Brian C. Stoltz ◽  
Melissa D. Hankins ◽  
Karen L. Torres ◽  
Stanley E. Jones
Keyword(s):  
Surface Area ◽  
Excellent Agreement ◽  
Target Material ◽  
Normal Pressure ◽  
High Density ◽  
Laboratory Scale ◽  
Large Surface Area ◽  
Cavity Expansion ◽  
Foundry Sand

In another paper [1], the authors presented an approach to penetration of a particulate target. This theory is based on the friction that the particles of target material present to the entire penetrator surface, including its shank. The shank of the penetrator affords a very large surface area compared to that of the nose. Even modest friction acting on the shank can provide a fairly large retarding force. Normal pressure acting on the projectile is assumed to be velocity-squared dependant, as indicated by a number of methods, including cavity expansion modeling [2]. Penetration of sand and soil has been considered by numerous investigators, e.g. [3–5]. These investigations did not directly address the frictional component of the net resisting force acting on the penetrator. A series of laboratory scale penetrations tests were performed. Data from these tests was used to evaluate the parameters in the model. Fine foundry sand is a high-density medium (1960 kg/m3) with a small amount of friction. This contrasts the target used by the authors in [1], which had a sizable amount of friction. Results from the theory are in excellent agreement with the experiments with velocities as high as 630 m/sec.

Synthesis and Characterization of Low Density Bi-2223 Cuprates Superconductor Doped Eu2O3 Nanoparticles

2021 ◽  
Vol 317 ◽  
pp. 131-137
Author(s):  
Suhaimi Nurbaisyatul Ermiza ◽  
Azhan Hashim ◽  
Azman Kasim ◽  
Norazila Ibrahim ◽  
Siti Fatimah Saipuddin
Keyword(s):  
Solid State Reaction Method ◽  
Synthesis And Characterization ◽  
Crystallographic Structure ◽  
Low Density ◽  
Superconducting Properties ◽  
X Ray Diffraction ◽  
Conventional Solid State Reaction ◽  
X Ray ◽  
Resistivity Measurements

Bi1.6Pb0.4Sr2Ca2-xEuxCu3Oδ cuprates superconductor doped with Eu nanoparticles (x = 0.0000, 0.0025, 0.0200 and 0.0500) were synthesized through conventional solid state reaction method. Crystalline sucrose was added during pelletization and burn at 400°C for two hours to create low density sample. The effect of doping Eu2O3 nanoparticles on the structural and superconducting properties by means of critical temperature (Tc), critical current density (Jc), X-ray diffraction (XRD) together with Field Emission Scanning Electron Microscopy (FESEM) and Alternating Current Susceptibility (ACS) were studied. Based on XRD analyses, the crystallographic structure has shown slightly changed from tetragonal to orthorhombic. The amount of 2223 phase gradually decreased with the increment of Eu concentration which indicates that Eu nanoparticles substitution favours the growth of 2212 phases. The resistivity measurements show that the highest Tcvalue for doped samples found at 90 K for x = 0.0025. The FESEM images showed that the plate-like grains become smaller and distributed randomly without specific alignment due to the increment of Eu concentration.

Monolithic NPG nanoparticles with large surface area, tunable plasmonics, and high-density internal hot-spots

Nanoscale ◽  
2014 ◽  
Vol 6 (14) ◽  
pp. 8199-8207 ◽  
Author(s):  
Fusheng Zhao ◽  
Jianbo Zeng ◽  
Md Masud Parvez Arnob ◽  
Po Sun ◽  
Ji Qi ◽  
...  
Keyword(s):  
Surface Area ◽  
Hot Spots ◽  
High Density ◽  
Large Surface Area ◽  
Plasmonic Nanoparticles

NPG disks as novel plasmonic nanoparticles greatly promote plasmon-matter interactions.

The Reduction Properties of Hexa Aluminates Substituted by Different Metal Ions for Denitrification System

2013 ◽  
Vol 734-737 ◽  
pp. 2364-2368
Author(s):  
Xiao Guang Ren ◽  
Fu Xia Li ◽  
Peng Li ◽  
Wei Hou
Keyword(s):  
Metal Ions ◽  
Surface Area ◽  
Catalytic Performance ◽  
Precipitation Method ◽  
Temperature Programmed Reduction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Temperature Programmed ◽  
Co Precipitation

In this study, the hexaaluminate catalyst SrMnMAl10O19-δ（M= Cd、Co、Cu 、Fe、Ni、Zn、Zr、Cr and Y）and SrMnFexAl11-xO19-δ(x=1, 2, 4, 6, 8)have been prepared by co-precipitation method. The catalysts were characterized by powder X-ray diffraction (XRD), surface area (BET), hydrogen temperature programmed reduction (H2-TPR). The reduction catalyst properties of hexaaluminate for deNOx were evaluated by using devices of micro-evaluation. The results showed that the CO could remove NOx very well. The hexaaluminate not only have a good catalytic performance, but also can form a complete crystal calcined at 1200 °C for 4 h.

Preparation of High Surface Area Ni-SDC Cermets Using a Surfactant-Assisted Co-Precipitation Method

2006 ◽  
Vol 942 ◽  
Author(s):  
Sang Joon Park ◽  
Tae Wook Eom ◽  
Jae Eun Oh ◽  
Hae Kwang Yang ◽  
Kyung Hwan Kim
Keyword(s):  
Surface Area ◽  
Cetyltrimethylammonium Bromide ◽  
High Surface ◽  
High Surface Area ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Two Phases ◽  
Co Precipitation ◽  
Surfactant Assisted

ABSTRACTA surfactant-assisted co-precipitation method was employed for obtaining high surface area Ni-SDC with improved structural properties for SOFC applications. In the work, a cationic surfactant, cetyltrimethylammonium bromide(CTAB) was employed with NiCl2, SmCl3 and CeCl3 as precursors and NH4OH as mineralizer. The elimination of surfactants upon calcination gives rise to the formation of high surface area NiO-SDC. When calcined at 600°C, the powders with surface area of 249 m2/g, were obtained and the pore size was 14.45 nm. The powders consist of two phases, the cubic NiO and SDC confirmed with X-ray diffraction identification.

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