A Study of Calcination Conditions for Synthesizing Fine Particles of (Nd0.33Eu0.33Gd0.33)Ba2Cu3Oy and (Nd0.33Eu0.33Gd0.33)2BaCuO5 View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2016-05

AUTHORS

Atikorn Wongsatanawarid, Sunsanee Pinmangkorn, Somchai Wongwises, Masato Murakami

ABSTRACT

The calcination temperature was studied for optimum processing conditions for preparing (Nd0.33Eu0.33Gd0.33) Ba2Cu3Oy (NEG-123) and (Nd0.33Eu0.33Gd0.33)2BaCuO5 (NEG-211) powders with good quality and fine size. This study used commercially available raw powders of Nd2O3, Eu2O3, Gd2O3, BaO2, and CuO in a purity of 99.9 % with 3–5- μm particle size. These raw powders were carefully weighed to have the compositions of NEG-123 and NEG-211 and pressed into pellets 25 g in weight. The samples were placed in a box furnace under ambient atmosphere and heated to temperatures of 820, 840, 860, and 880 ∘C at a rate of 100 ∘C/h, held there for 24 h, followed by cooling at 100 ∘C/h. X-ray diffraction analyses showed that almost all the samples are single phase except NEG-123 processed at 820 ∘C. The average particle size of NEG-123 powders increased with increasing processing temperatures, while that of NEG-211 remained in the same range below 5 μm irrespective of the treatment temperature. Since the particle size of NEG-123 powders was around 10 mm, one need to refine the particle size below 5 μm with a technique like mechanical grinding for the production of high Jc NEG-Ba-Cu-O bulk super conductors. NEG-211 powders will be suitable for such a use in the present form. The homemade powders were used to fabricate NEG-Ba-Cu-O bulk by cold top seeding melt growth with MgO seed following by oxygen annealing treatment. The characterization of bulk demonstrated critical temperature at 65 K with maximum critical current density of 70,000 kA/cm 2 at 10 K with H//c-axis. More... »

PAGES

1233-1240

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10948-016-3414-5

DOI

http://dx.doi.org/10.1007/s10948-016-3414-5

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1015790079


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