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Accurate Determination of the Redox State in High‐ T c Superconductor Oxides
Author(s) -
Maier J.,
Murugaraj P.,
Lange C.,
Rabenau A.
Publication year - 1988
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.198809801
Subject(s) - superconductivity , redox , ceramic , oxygen , analytical chemistry (journal) , oxide , materials science , semiconductor , high temperature superconductivity , inorganic chemistry , oxygen pressure , chemistry , condensed matter physics , metallurgy , optoelectronics , physics , chromatography , organic chemistry
The determination of the excess oxygen content in high‐ T c superconductors is especially important. The efficiency of two new methods by which δ is determined directly has been demonstrated using the prototypic semiconductor YBa 2 Cu 3 O 6.5+δ . In one method the shift of the Fe 2⊕ /Fe 3⊕ concentration ratio is determined, whereas in the other the O 2 ‐pressure after reaction of the oxide ceramic with water is measured.