Chiang Mai Journal of Science

Print ISSN: 0125-2526 | eISSN : 2465-3845

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Quantitative Phase Analysis and Crystal Structure of DyBCO Ceramics Prepared at Diferent Sintering Conditions

Paitoon Boonsong, Pimpilai Wannasut, Ampika Rachakorn and Anucha Watcharapasorn
* Author for corresponding; e-mail address: anucha@stanfordalumni.org
Volume: Vol.45 No.4 (July 2018)
Research Article
DOI:
Received: 22 Febuary 2017, Revised: -, Accepted: 18 April 2017, Published: -

Citation: Boonsong P., Wannasut P., Rachakorn A. and Watcharapasorn A., Quantitative Phase Analysis and Crystal Structure of DyBCO Ceramics Prepared at Diferent Sintering Conditions, Chiang Mai Journal of Science, 2018; 45(4): 1835-1842.

Abstract

  The DyBCO ceramics were fabricated by solid-state reaction method under a normal air atmosphere using a stoichiometric amount (i.e. Dy:Ba:Cu = 1:2:3) of high-purity Dy2O3, BaCO3 and CuO starting powders, which were previously mixed and calcined at 900oC for 4 h. The green DyBCO pellets were sintered at various sintering temperatures (i.e. 850, 900, 930, 950 and 980oC) for 2 h. The influence of sintering process on phase formation of ceramics was observed by X-ray diffraction (XRD). The quantitative phase analysis of ceramics was analyzed by fitting the XRD pattern using the PowderCell program. The results showed that the DyBa2Cu3O7-δ composition was identified as the main crystalline phase. At higher temperatures (> 950oC), the Dy2BaCuO5 (Dy-211) secondary phase was observed. The relative fraction of various phases was discussed in relation to phase formation and density change. The SEM-EDS/WDS images of ceramics exhibited irregular shaped grains. The average grain size increased from ~2.3 to ~7.0 µm when the sintering temperature was increased. The possibility of stoichiometric change in DyBCO ceramic due to different processing conditions was also discussed in details.

Keywords: DyBa2Cu3O7-δ, sintering, ceramic, quantitative phase analysis, crystal structure

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