Recent developments in melt processed Gd-123 and MgB2 materials at RTRI

Muralidhar Miryala, Y. Fukumoto, A. Ishihara, K. Suzuki, M. Tomita, Michael Rudolf Koblischka, A. Yamamoto, K. Kishio

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

In this contribution we will report on the current status, recent developments in GdBa2Cu3Oy "Gd-123" and MgB2 material processing, characterization, and applications at the Railway Technical Research Institute (RTRI). Batch-processing of Gd-123 bulk material grown in air was performed using novel thin film Nd-123 seeds grown on MgO crystals. In this way, we are able to fabricate materials with good quality, and uniform performance. We examined the technology of the uniform performance of the large 45 mm diameter, single grain Gd-123 bulks for use in application of NMR. For this purpose, four 5 mm thick pieces are cut vertically from a single grain Gd-123 material and the magnetic field distribution is measured using a scanning hall sensor. We found that all four pieces are single domain and exhibit a quite uniform field distribution. Furthermore, the batch-processed bulk materials are used for the construction of a chilled Maglev vehicle. On the other hand, to optimize the trapped field performance of bulk MgB2 material, several samples were prepared by solid state reaction at different temperatures ranging from 750 to 950 °C in pure argon atmosphere. X-ray diffraction results indicated that single phase and homogenous MgB2 bulks are produced when sintering them around 775 °C. Further, atomic force microscopy (AFM) and scanning electron microscopy (SEM) indicated that an uniform grain size results by controlling the processing temperature. So, higher trapped fields can be achieved in sintered MgB2 material.

Original languageEnglish
Pages (from-to)5-10
Number of pages6
JournalPhysica C: Superconductivity and its Applications
Volume496
Issue numberC
DOIs
Publication statusPublished - 2014 Jan 15
Externally publishedYes

Fingerprint

batch processing
seeds
sintering
vehicles
grain size
argon
atomic force microscopy
solid state
Magnetic levitation vehicles
atmospheres
nuclear magnetic resonance
scanning electron microscopy
scanning
temperature
sensors
air
thin films
Argon
diffraction
magnetic fields

Keywords

  • Gd-123
  • MgB
  • Microstructure analysis
  • Trapped magnetic field

ASJC Scopus subject areas

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

Cite this

Recent developments in melt processed Gd-123 and MgB2 materials at RTRI. / Miryala, Muralidhar; Fukumoto, Y.; Ishihara, A.; Suzuki, K.; Tomita, M.; Koblischka, Michael Rudolf; Yamamoto, A.; Kishio, K.

In: Physica C: Superconductivity and its Applications, Vol. 496, No. C, 15.01.2014, p. 5-10.

Research output: Contribution to journalArticle

Miryala, Muralidhar ; Fukumoto, Y. ; Ishihara, A. ; Suzuki, K. ; Tomita, M. ; Koblischka, Michael Rudolf ; Yamamoto, A. ; Kishio, K. / Recent developments in melt processed Gd-123 and MgB2 materials at RTRI. In: Physica C: Superconductivity and its Applications. 2014 ; Vol. 496, No. C. pp. 5-10.
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