Novel seed for batch cold seeding production of GdBaCuO bulks

M. Muralidhar, M. Tomita, K. Suzuki, Y. Fukumoto

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

A batch process for fabrication of GdBa2Cu3O y pellets in air was developed. The samples were melt-processed using the cold-seeding method and as seeds Nd-123 thin films grown on MgO crystals. We used a self-made Gd-123 and Gd-211 powders mixed with 0.1 wt.% of Pt. Up to 1-1.5 kg of melt-grown Gd-123 bulks can be prepared in one process. XRD results confirmed that all the bulks are c-axis oriented. The superconducting and magnetic performance of the pellets is checked on several small test samples cut out at various standard positions within the bulk. The values are quite uniform and performance is similar to the oxygen-controlled melt-grown Gd-123 samples. The average trapped field at 77 K in the 24 mm diameter samples batch lies between 0.8 and 0.9 T. The maximum trapped field of 1 T at the sample surface was the highest value reported so far for Gd-123 single grains processed in air. The present results prove that a high-performance good-quality LREBa 2Cu3Oy material can scale up from laboratory conditions to industrial production.

Original languageEnglish
Pages (from-to)1158-1163
Number of pages6
JournalPhysica C: Superconductivity and its applications
Volume470
Issue number20
DOIs
Publication statusPublished - 2010 Nov 1

Keywords

  • Batch process
  • Flux pinning
  • Gd-123 superconductor
  • Microstructure analysis
  • Trapped filed analysis

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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