Effect of Heat Treatment on Ca Substitution in a Porous Y(Ba&lt;sub&gt;1-x&lt;/sub&gt;Ca&lt;sub&gt;x&lt;/sub&gt;)&lt;sub&gt;2&lt;/sub&gt;Cu&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;7-δ &lt;/sub&gt;Superconductor

Norazidah, A. W.; Hashim, Ahmad Hariza; Kasim, Azman; Hidayah, H. N.; Hawa, J. S.

doi:10.4028/www.scientific.net/amr.895.71

Cited by 4 publications

(3 citation statements)

References 10 publications

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“…For High-Temperature Superconductors (HTS) that exhibit Tc above 77K, the effects of material manipulations may be studied via doping of impurity into the crystal structure. Many researches have been conducted in observing Tc and Jc performances due to different percentages of impurity doping such as Ag, Sb [2,3,4], Ca [5], Pb [6], Au [7], Sm [8] in various sites of YBCO superconductor.…”

Section: Introductionmentioning

confidence: 99%

Structural and Electronic Properties of Ag-Doped in Ba-Site of YBa2-xAgxCu3Oδ Using Density Functional Theory via First Principle Study

Saipuddin

Mahmood

Hashim

et al. 2021

SSP

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This study reports on the First Principle Study via Density Functional Theory (DFT) used to determine the structural and electronic properties of Ag-dopant in Ba-site of YBa2-xAgxCu3Oδ superconductor. The computational method adopting CASTEP computational code was used to calculate the structural and electronic properties for Ag-dopant in range of x=0.150 to x=0.250 in Ba-site of YBa2-xAgxCu3Oδ to enhance the performance finding of experimental work shown at dopant x=0.20 ceramic superconductor. The structural changes in terms of lattice parameters were compared as the percentage of dopant increases to seek both CuO chain and CuO2 plane bond length and the spontaneous strain variance on the structure orthorhombicity. The crystal structure constructed and calculated using Visual Crystal Approximation (VCA) applying the local density approximation (LDA) and ultrasoft pseuodopotential. Geometry optimization shown energy converged at 400 eV with k-point sampling of 4x4x1. The structural properties of YBa2-xAgxCu3Oδ are observed to be approximately close to the experimental data obtained by other researches. The electronic properties were determined via energy band gap, density of states and electron energy differences visualisation a to further enhance the experimental findings.

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Section: Introductionmentioning

confidence: 99%

Structural and Electronic Properties of Ag-Doped in Ba-Site of YBa2-xAgxCu3Oδ Using Density Functional Theory via First Principle Study

Saipuddin

Mahmood

Hashim

et al. 2021

SSP

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“…Filling of crystalline sucrose does not destroy the superconductive properties yet it enables the fabrication of samples with good mechanical properties. Superconducting porous with small open porosity can be easily and continuously reinforced in order to improve their mechanical properties hence can overcome the forces encountered in levitation and quasipermanent magnet applications [7].…”

Section: Introductionmentioning

confidence: 99%

SUPERCONDUCTING PROPERTIES OF Y2Ba5Cu8Oδ (Y258) POROUS AND NON- POROUS STRUCTURE

2018

MJAS

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Solid state reaction method was applied to produce porous and non-porous ceramic materials through a series of heating and grinding. This study revealed the distinguish properties of Y258 in terms of their porous and non-porous structure. The bulk material usually loses its high temperature features due to increase in critical current density. Therefore, it is essential to investigate the porous structure that influences the superconducting properties. The electrical properties of superconductor due to critical temperature, T c and critical current density, J c were determined using Resistivity Measurement System (RMS). The morphological structure of superconductor material was analysed by using Scanning Electron Microscopy (SEM). The grain boundary of porous structure is significant to induce higher conductivity without detriment the critical temperature of the superconductor. The higher J c recorded for porous Y258 was 1.59 A/cm 2 at 50 K. The J c value was higher compared to nonporous optimal structure which is 1.42 A/cm 2. The T c zero for porous and non-porous sample gives the same value which is 78 K for both samples. Results of Y247 doped with Ca were determined for comparison.

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“…Filling of crystalline sucrose does not destroy the superconductive properties, moreover enable fabrication of samples with good mechanical properties. Superconducting porous with small open porosity can easily be continuously reinforced, to improve their mechanical properties and thus, to overcome the forces encountered in levitation and quasipermanent magnet applications [7]. Thus, the aim of this research is to optimize the parameter of crystalline sucrose addition as a filler on porous microstructure of Bi-2223 system.…”

Section: Introductionmentioning

confidence: 99%

Structural and Superconducting Properties of Bi-Based Low Density HTSC

Azura

Hashim

Azman

et al. 2015

AMR

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Low density HTSC with nominal composition of Bi1.6Pb0.4Sr2Ca2Cu3Oy filled with crystalline sucrose has been synthesized and its structucal and superconducting properties have been studied. The transport properties, morphology, density and structural identification were determined by using the standard four point probe, Field Emission Scanning Electron Microscope (FESEM), densitometer and X-ray diffraction (XRD) respectively. The critical current density (Jc) of optimized ratio of crystalline sucrose onto Bi-2223 powder used to produce low density Bi-based superconductor was found to be higher than the bulk polycrystalline sample. TC zero obtained was varied between 93 and 101 K towards the increment ratio of crystalline sucrose with the highest TC zero = 101 K for ratio of 0.050:1.950 and decrease gradually for further addition of cystalline sucrose. The crystallographic structures was found to be remained in tetragonal where a=b≠c. The grains with higher porosity resulting in decreasing of critical current density (Jc) as well as critical temperature (Tc zero) due to lack of effective area of current flows.

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Effect of Heat Treatment on Ca Substitution in a Porous Y(Ba<sub>1-x</sub>Ca<sub>x</sub>)<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ </sub>Superconductor

Cited by 4 publications

References 10 publications

Structural and Electronic Properties of Ag-Doped in Ba-Site of YBa<sub>2-x</sub>Ag<sub>x</sub>Cu<sub>3</sub>O<sub>δ</sub> Using Density Functional Theory via First Principle Study

Structural and Electronic Properties of Ag-Doped in Ba-Site of YBa<sub>2-x</sub>Ag<sub>x</sub>Cu<sub>3</sub>O<sub>δ</sub> Using Density Functional Theory via First Principle Study

SUPERCONDUCTING PROPERTIES OF Y2Ba5Cu8Oδ (Y258) POROUS AND NON- POROUS STRUCTURE

Structural and Superconducting Properties of Bi-Based Low Density HTSC<sup></sup>

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