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Electron/proton transfer reactions and superconductivity: The role of hydrogen in lanthanum copper oxide
Author(s) -
Rudolf Peter,
Paulus Werner,
Schölhorn Robert
Publication year - 1991
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.19910030907
Subject(s) - lanthanum , materials science , oxide , copper , inorganic chemistry , superconductivity , copper oxide , hydrogen , proton , hydroxide , phase (matter) , electron transfer , lanthanum oxide , oxygen , photochemistry , chemistry , metallurgy , condensed matter physics , physics , organic chemistry , quantum mechanics
Communication: Is lanthanum copper oxide really lanthanum copper oxide? Evidence is presented showing that the conventionally prepared semiconductor La 2 CuO 4 , which has been the starting material in many studies of the high‐ T c superconducting copper oxides, is in fact a nonstoichiometric oxide hydroxide (La 1.95 CuO 3.86 (OH) 0.14 ). It is also shown that the conversion of the semiconducting phase to the superconducting phase by anodic oxidation does not proceed via the insertion of oxygen into the La 2 CuO 4 but rather over an electron/proton transfer process.