CUED Publications database

Introduction of Nano Ceria into Infiltration Growth Processed YBCO Superconducting Composites

Swarup Raju, PM and Kumar, ND and Kumar Naik, SP and Rajasekharan, T and Seshubai, V (2014) Introduction of Nano Ceria into Infiltration Growth Processed YBCO Superconducting Composites. Journal of Superconductivity and Novel Magnetism, 27. pp. 2277-2282. ISSN 1557-1939

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Abstract

© 2014, Springer Science+Business Media New York. Introduction of nanoparticles as flux pinning centers in yttrium barium copper oxide (YBCO/Y-123) superconductors has been extensively explored in order to improve high field current-carrying capabilities. A uniform distribution of these nanodopants throughout the superconducting matrix is the most essential and desirable. The present work provides a nonconventional approach of introducing nanoparticles into YBCO superconductors by introducing nanoparticles in Y2BaCuO5(Y-211) preform and then subjecting the preform to infiltration and growth process. The Y-211 preform containing 2 wt.% ceria nanoparticles of the order of 60 nm is referred to as Ce-2 preform. The microstructure of Ce-2 preform shows a uniform distribution of nanoparticles without much interaction even to a temperature of 950 °C. At a higher concentration, a mild interaction was observed which in a way aided in keeping the nanoparticles firmly attached to Y-211 particles. Superconducting transition temperature (Tc) of Ce-2 has reduced to 86 from 92 K of pure YBCO with a broad transition. Microstructures of Ce-2 composite suggest strong interaction of ceria nanoparticles with Y-211 as well as with liquid phases which resulted in the formation of fine particles of BaCeO3of the order of 200 nm, which has been observed by many investigators. It is possible that some amount of ceria might have entered into a superconducting matrix which can reduce Tcas reported earlier. The presence of low Tcphase along with a large number of fine particles have improved critical currents densities (Jc) to a field of 9 T at 65 K. The present approach has demonstrated substantial improvement in Jcat high fields at the expense of low and broad Tc. ∖AuthQuery{Q2}{The sentence “The present approach provides a scope for detail study on reaction mechanisms and infiltration process in IGP with nanoparticles” was modified to “The present approach provides a scope for detailed study on reaction mechanisms in infiltration and growth process (IGP) with nanoparticles.” Please check if the edit made appropriately retains the intended meaning of the sentence.}The present approach provides a scope for detailed study on reaction mechanisms in infiltration and growth process (IGP) with nanoparticles.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 20:09
Last Modified: 19 Jul 2018 06:57
DOI: