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Effect of heat treatment condition on the phase formation of YBa2Cu3O7-δ superconductor


Citation

Mohd Hapipi, Nurhidayah and Shaari, Abdul Halim and Awang Kechik, Mohd Mustafa and Tan, Kar Ban and Abd Shukor, Roslan and Mohd Suib, Nurul Raihan and Chen, Soo Kien (2017) Effect of heat treatment condition on the phase formation of YBa2Cu3O7-δ superconductor. Solid State Phenomena, 268. pp. 305-310. ISSN 1012-0394; ESSN: 1662-9779

Abstract

Polycrystalline samples with the nominal composition YBa2Cu3O7-δ (Y-123) were prepared using the co-precipitation method. The effect of the calcination process (single and multiple calcinations) on the samples was investigated by using the four-point temperature-resistance measurement, x-ray diffraction (XRD) and field-emission scanning electron microscope (FESEM). This study is divided into two parts. For the first part, the obtained oxalate powder underwent two calcination processes at 900 °C for 12 h and 900 °C for 24 h, respectively. Then, the powders were pressed into pellets and sintered at 920 °C for 15 h with oxygen flow during the entire heat treatment. In the second part, only one calcination process was undertaken at 900 °C for 24 h before the sintering process in oxygen flow at 920 °C for 15 h. From the XRD patterns, all of the peaks were indexed to the Y-123 phase showing that this superconducting phase was already formed after the first calcination. The volume fraction of Y-123 of the samples with single calcination process was higher compared to multiple calcination processes. From the temperature-resistance measurement, all the samples showed metallic behavior in the normal state and a superconducting transition to zero resistance. The superconducting transition temperature, Tc, for the samples prepared in a single calcination process is higher than that of the multiple calcination processes.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
Institute of Advanced Technology
DOI Number: https://doi.org/10.4028/www.scientific.net/SSP.268.305
Publisher: Trans Tech Publications
Keywords: Co-precipitation; FESEM; Superconductivity; XRD; YBa2Cu3O7-δ
Depositing User: Nabilah Mustapa
Date Deposited: 11 Jun 2018 08:33
Last Modified: 11 Jun 2018 08:33
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.4028/www.scientific.net/SSP.268.305
URI: http://psasir.upm.edu.my/id/eprint/13462
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