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Effect of preform compaction pressure on the final microstructures and superconducting properties of YBa2Cu3O7-δ superconductors fabricated by directionally solidified Preform optimized infiltration growth process

Devendra Kumar, N and Missak Swarup Raju, P and Pavan Kumar Naik, S and Rajasekharan, T and Seshubai, V (2014) Effect of preform compaction pressure on the final microstructures and superconducting properties of YBa2Cu3O7-δ superconductors fabricated by directionally solidified Preform optimized infiltration growth process. Journal of Low Temperature Physics, 174. pp. 113-127. ISSN 0022-2291

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Abstract

Bulk YBa 2 Cu 3 O 7-δ (YBCO, Y-123) superconductors with reasonable critical current densities J c are successfully fabricated in relatively short-time durations employing Directionally Solidified Preform Optimized Infiltration Growth Process (DS-POIGP). The effect of preform compaction pressure, applied to Y 2 BaCuO 5 (Y-211) preform prior to the infiltration of liquid phases, on the end microstructures and current densities is investigated. It is found that a preform compaction pressure of 460 MPa resulted in samples with superior microstructures and superconducting properties. YBCO sample fabricated by DS-POIGP under optimized conditions revealed presence of fine-sized Y-211 particles distributed uniformly in the matrix of Y-123 causing large interfacial defect density (Y-211/Y-123). Extensive twinning on a nano-scale with twins in the size range of 40-100 nm is observed in the optimized sample. These microstructural parameters enabled a considerable improvement in the field dependence of J c . Irreversibility fields greater than 5.5 Tesla even at 77 K are achieved in the optimized sample fabricated by DS-POIGP. © 2013 Springer Science+Business Media New York.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:25
Last Modified: 18 Nov 2017 21:56
DOI: