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Effect of nano sized oxalate precursor on the formation of REBa 2 Cu 3 O 7−δ (RE= Gd, Sm, Ho) ceramic via coprecipitation method

Hamadneh, Imad and Khalili, Fawwaz and Shaaer, Mazen and Rosli, Ahmad Mustaza (2010) Effect of nano sized oxalate precursor on the formation of REBa 2 Cu 3 O 7−δ (RE= Gd, Sm, Ho) ceramic via coprecipitation method. Journal of Physics: Conference Series, 234 (1). 012016.

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Official URL: http://stacks.iop.org/1742-6596/234/i=1/a=012016

Abstract

The formation REBa 2 Cu 3 O 7−δ (RE= Gd, Sm and Ho) superconducting ceramics from metal oxalate precursors with average grain size less than 50 nm using the coprecipitation method is reported. The metal oxalate powders were heated at 900 o C for 12 hours, pelletized and then sintered at 920°C for 15 hr. The high-T C phase was observed for all samples as an evidence for the single step transition of (R-T) curves. The T C(R=0) for samples Gd123, Ho123 and Sm123 were 95 K, 93 K, 91 K, respectively. XRD data showed single phase of an orthorhombic structure for Sm123 and Ho123 samples, small amount of impurities (Gd211) phase were detected for Gd123. SEM micrographs showed large grain sizes that are randomly distributed. These results showed that COP method using nano sized metal oxalates starting powders is very effective to synthesize high quality superconductors and shorten the sintering time required. The formation Gd211 phase for the Gd123 sample might act as a pinning centre explaining the enhancement of the transport properties.

Item Type:Article
ID Code:11228
Deposited By:Prof. Alexey Ivanov
Deposited On:01 Nov 2011 23:29
Last Modified:02 Nov 2011 00:47

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