[13a-B406-1~10] 11.1 Fundamental properties

[13a-B406-8] [Young Scientist Presentation Award Speech] Development of fast oxygenation process and discussions on oxygen-diffusion mechanism for REBCO melt-textured bulks

〇Takanori Motoki¹, Kota Nunokawa¹, Yu Yanai¹, Shinkichi Gondo¹, Shin-ichi Nakamura², Jun-ichi Shimoyama¹ (1.Aoyama Gakuin Univ., 2.TEP)

Keywords:REBCO, melt-textured bulks, oxygen-diffusion

Oxygenation process is indispensable for as-synthesized REBCO materials to achieve high critical temperature more than 90 K since REBCO has a large oxygen nonstoichiometry and REBCO is always in the carrier underdoped state after the crystal growth. It is one of the major problems in REBCO melt-textured bulks that oxygen-annealing needs hundreds of hours owing to quite slow oxygen-diffusion in textured bulk materials. In this study, we attempted to introduce water vapor to the oxygenation process in order to shorten oxygenation-time. In addition, investigations on oxygen-diffusion mechanism for melt-textured bulks were carried out using single-domain and multi-domain bulks.