Premium
YBa 2 Cu 3 O 7‐δ superconductor bulks composited by Y 2 BaCuO 5 nanoparticles derived from homogeneous nucleation catastrophe
Author(s) -
Liu Yan,
Pan Bin,
Li Zhi,
Xiang Hui,
Qian Jun,
Du Gehai,
Huang Simin,
Yao Xin,
Izumi Mitsuru,
Wang Ying
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14963
Subject(s) - nucleation , homogeneous , materials science , nanoparticle , superconductivity , epitaxy , chemical engineering , crystallography , nanotechnology , condensed matter physics , chemistry , thermodynamics , layer (electronics) , physics , engineering
The refinement of Y 2 BaCuO 5 (Y211) particles is a matter of significant importance in fabricating high‐performance YBa 2 Cu 3 O 7‐δ (Y123) superconductor bulks by top‐seeded melt growth (TSMG). However, coarsening and epitaxial growth naturally occur to the preexisting Y211 grains in the conventional process, causing an unwanted size enlargement. Here, for the first time, we report a novel TSMG approach in which instead of Y211, modified precursor powders (MPP, Y 2 O 3 , and Ba 2 Cu 3 O x ) were employed. As a result, massive numbers of Y211 nanoparticles were derived from the homogeneous nucleation catastrophe through peritectic solidification of Y 2 O 3 +Ba x ‐Cu y ‐O→Y211. Correspondingly, superior property of trapped field was achieved from the MPP ‐processed bulk.