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Preparation of the High‐Quality Superconductor La 1 Ba 2 Cu 3 O y
Author(s) -
Wada Takahiro,
Suzuki Nobuo,
Yamauchi Hisao,
Tanaka Shoji,
Maeda Atsutaka,
Uchinokura Kunimitsu
Publication year - 1989
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.1151-2916.1989.tb06019.x
Subject(s) - superconductivity , sintering , analytical chemistry (journal) , annealing (glass) , oxygen , materials science , mineralogy , nuclear chemistry , metallurgy , chemistry , condensed matter physics , physics , environmental chemistry , organic chemistry
The relationship between the preparation procedure and superconducting properties of La 1 Ba 2 Cu 3 O y was studied. A series of samples was sintered in an N 2 ‐gas atmosphere for various lengths of time ranging from 1 to 40 h, followed by a fixed annealing procedure in O 2 . It was found that the shorter the sintering period, the higher was the oxygen content. The samples sintered for a period of less than 15 h contained excess oxygen compared with La 1 Ba 2 Cu 3 O 7 and exhibited poor superconducting properties. The sample sintered for 40 h had an oxygen content y equal to 6.95, and had excellent superconducting properties. The mechanism for preparing high‐quality La 1 Ba 2 Cu 3 O y is discussed.