Top surface morphologies of melt growth processed Y1.5Ba2Cu3O7− bulk superconductors with corner or edge seeding

Kim, C.-J.; Jung, Sung Yong; Park, H.-W.; Jun, Byung‐Hyuk; Park, S.-D.

doi:10.1016/j.physc.2013.09.012

Cited by 3 publications

(1 citation statement)

References 11 publications

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“…Several modified TSMG processes have been attempted to reduce theprocessing time of the bulk superconductors [4][5][6][7][8][9][10]. In conventional and other modified TSMG processes, seeds are placed on the outer surfaces; in thecenter [1-4, 7, 8], on the corner [11] of the top surfaces or on thebottom [9] of the power compacts. The TSMG process utilizes a one-directional growth process (figure 1(a)).…”

Section: Introductionmentioning

confidence: 99%

Interior seeding for the fabrication of single-grain REBCO bulk superconductors

Kim

Park

et al. 2016

Supercond. Sci. Technol.

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This study presents a new seeding technique, named ‘interior seeding’ which allows the growth of a single REBCO (RE: rare-earth elements) grain in the interior of REBCO compacts. The key techniques of interior seeding are to provide appropriate open space for seeds in the interior of REBCO powder compacts to supply air or oxygen to the seeds, and to minimize the contact area between the seeds and liquid. The advantages of interior seeding are as follows: (1) simultaneous growth from the seed to the top and bottom of the REBCO compacts is possible, (2) fractions of the a-b growth sector and the a-c growth sector on the top surface can be controlled and (3) the top surfaces of the single-grain REBCO bulk superconductors are free from samarium or neodymium contamination from the used seeds. The very large single-grain Y1.5Ba2Cu3O7−y (Y1.5) bulk superconductors (42 mm) were successfully fabricated using a melt growth (MG) process combined with interior seeding. Also, large-grain Y1.5 bulk superconductors (41 mm) with 〈110〉/〈110〉 and 〈100〉/〈100〉 grain junctions were fabricated using multiple interior seeding. In this paper, the detailed process of interior seeding, the development of top surface patterns and the properties of single-grain Y123 bulk superconductors fabricated using interior seeding were reported.

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