Superconducting Properties of Calcium Substitution in Barium Site of Porous YBa&lt;sub&gt;2&lt;/sub&gt;Cu&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;7&lt;/sub&gt; Ceramics

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

doi:10.4028/www.scientific.net/amr.501.294

Cited by 10 publications

(8 citation statements)

References 7 publications

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“…Larger grain size will enhance the grains continuity, lessen the porosity thus enhance the Jc value. Smaller grain size and irregular grain shape induced by Ca substitution in Y146 system will decrease the Jc as compared to that of pure Y123 [8,9].…”

Section: Resultsmentioning

confidence: 99%

Porosity Effect on Superconducting Properties of YBa2Cu3Oδ and YCaBa4Cu6Oδ

Senawi¹,

Hashim²,

Zainal

et al. 2015

AMR

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This paper reports on the properties of YBa2Cu3Od (Y123) and YCaBa4Cu6Oy (Y146) with non-porous and porous structures. The relationship between calcium doping and critical temperature (Tc) was studied to determine the optimal superconducting properties. A series of heating and grinding via solid state reaction method was used to fabricate the ceramic materials. The electrical properties were investigated via critical temperature, TC and critical current density, JC using the resistivity measurement system (RMS). Scanning Electron Microscope (SEM) and X-Ray Diffraction (XRD) were used to analyze the material morphology and structure, respectively. The orthorhombicity increased due to less porosity of the samples. The calcium presence partially replaced larger Ba(II) site and degraded orthorhombicity. The highest critical current density (JC) was porous YCaBa2Cu3Oy which was 2.32 A/cm2 compared to 0.75 A/cm2 for porous YCaBa4Cu6Oy at 60 K. The critical temperature for porous structure was less than non porous structure for Ca doped Y146 system which was 69.9 K and 67.9 K. SEM micrograph unveiled that the Jc was induced significantly by continuity of grain formation via grain size. Pores homogenized the grains surface quality and connectivity due to strain release thus increasing effective cross section of the sample for current density (Jc) over the vast areas.

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Section: Resultsmentioning

confidence: 99%

Porosity Effect on Superconducting Properties of YBa2Cu3Oδ and YCaBa4Cu6Oδ

Senawi¹,

Hashim²,

Zainal

et al. 2015

AMR

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“…The value of J c was increased for samples with low density that has been created by introducing pores. This enhancement of J c is due to the grain alignment of the porous structure [9]. In addition, the increase of J c for porous sample might be due to the good electrical contact within the porous ceramic body rather than one just on the surface as in a dense sample [4].…”

Section: Resultsmentioning

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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“…The strength of super current depends on the proportion of grain boundaries with strong links [17]. This result showed that porous structure samples or low-density samples enhanced the J C due to the slight improvement of grain boundaries [18]. Crystalline sucrose that was used as a filler does not affect the superconductive properties [19].…”

Section: Resultsmentioning

confidence: 99%

The Influence of Ce-Doping on Structural and Superconducting Properties in Low-Density Bi1.6Pb0.4Sr2Ca2-xCexCu3Oy Superconductor

Robaiah

Hashim

Azman

et al. 2016

MSF

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The influences of cerium doped on low density Bi-2223 superconductor have been studied and this study examines the significant changes in the structural and superconducting properties. The nominal compositions of low density Bi1.6Pb0.4Sr2Ca2-xCexCu3Oy (where x =0.000, 0.025, 0.05, 0.1 and 0.2) ceramic superconductor were prepared by solid state method. The effects of different Ce doping levels on the superconductor structure and superconducting properties has been investigated by field emission scanning electron microscopy (FESEM), X-ray diffraction analysis (XRD), electrical resistance and transport critical current density (JC) measurements. The results show that TC zero and JC of the samples reduced gradually with the increase in the Ce addition. It has been observed that, the JC of low density Bi-2223 for Ce-free was measured to be 12.120 A/cm2 and 0.448 A/cm2 in x=0.025 at 60 K under zero magnetic field. As for XRD analysis showed the doping of Ce reduced the volume fraction of the 2223 phase and increased the volume fraction of the 2212 phase. FESEM results showed the surface morphology not homogenous and weak links between superconducting grains of the samples due to increase of the Ce doping.

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Superconducting Properties of Calcium Substitution in Barium Site of Porous YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub> Ceramics

Cited by 10 publications

References 7 publications

Porosity Effect on Superconducting Properties of YBa<sub>2</sub>Cu<sub>3</sub>O<sub>δ</sub> and YCaBa<sub>4</sub>Cu<sub>6</sub>O<sub>δ</sub>

Porosity Effect on Superconducting Properties of YBa<sub>2</sub>Cu<sub>3</sub>O<sub>δ</sub> and YCaBa<sub>4</sub>Cu<sub>6</sub>O<sub>δ</sub>

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

The Influence of Ce-Doping on Structural and Superconducting Properties in Low-Density Bi<sub>1.6</sub>Pb<sub>0.4</sub>Sr<sub>2</sub>Ca<sub>2-</sub><sub>x</sub>Ce<sub>x</sub>Cu<sub>3</sub>O<sub>y</sub> Superconductor

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