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http://dx.doi.org/10.9714/psac.2018.20.3.005

Effects of an artificial hole on the crystal growth of large grain REBCO superconductor  

Lee, Hwi-Joo (Korea Polytechnic University)
Hong, Yi-Seul (Korea Polytechnic University)
Park, Soon-dong (Korea Atomic Energy Research Institute)
Jun, Byung-Hyuk (Korea Atomic Energy Research Institute)
Kim, Chan-Joong (Korea Atomic Energy Research Institute)
Lee, Hee-Gyoun (Korea Polytechnic University)
Publication Information
Progress in Superconductivity and Cryogenics / v.20, no.3, 2018 , pp. 5-10 More about this Journal
Abstract
This study presents that various grain boundary junctions are prepared by controlling the seed orientation combined with an artificial hole in a melt process REBCO bulk superconductor. Large grain YBCO superconductors have been fabricated with various grain boundary junctions that the angle between the grain boundary and the <001> axis of Y123 crystal is $0^{\circ}$, $30^{\circ}$ and $45^{\circ}$, respectively. The presence of the artificial hole is beneficial for the formation of clean grain boundary junction and single peak trapped magnetic field profiles have been obtained. Artificial hole makes two growth fronts meet at a point on a periphery of the artificial hole. The presence of artificial hole is not likely to affect on the distribution of Y211 particles. The newly formed <110> facet lines are explained by the formation of new Y123/liquid interface with (010) crystallographic plane.
Keywords
REBCO; grain boundary junction; crystal growth; artificial hole; facet line;
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