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Rapid Calcination and Sintering of YBa 2 Cu 3 O x Superconductor Powder Mixture in Inert Atmosphere
Author(s) -
Rha Jong J.,
Yoon Kyung J.,
Kang SukJoong L.,
Yoon Duk N.
Publication year - 1988
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/j.1151-2916.1988.tb05931.x
Subject(s) - sintering , inert gas , calcination , tetragonal crystal system , inert , materials science , atmosphere (unit) , reducing atmosphere , analytical chemistry (journal) , vacancy defect , superconductivity , grain size , oxygen , mineralogy , crystallography , metallurgy , chemistry , crystal structure , condensed matter physics , composite material , biochemistry , physics , organic chemistry , chromatography , thermodynamics , catalysis
The rates of forming the superconducting YBa 2 Cu 3 O x phase during the calcination of the Y 2 O 3 , BaCO 3 , and CuO powder mixture at 790° and 850°C are considerably enhanced when an inert atmosphere of N 2 or He is used instead of O 2 . Sintering in an inert atmosphere also produces higher density and larger grain size than in O 2 . These results are consistent with the possibility of rapid atomic diffusion in tetragonal YBa 2 Cu 3 O x due to either high oxygen vacancy concentration or expanded lattice in an inert atmosphere.