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IR Absorption Peaks and Oxygen Vacancies in YBa 2 Cu 3 O x
Author(s) -
Shi T. S.,
Zhao Y. G.,
Cai P. X.,
Gu H. F.,
Xie L. M.
Publication year - 1988
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221480231
Subject(s) - oxygen , analytical chemistry (journal) , annealing (glass) , infrared spectroscopy , molecular vibration , bond length , superconductivity , vacancy defect , crystallography , absorption (acoustics) , intensity (physics) , spectral line , absorption spectroscopy , materials science , chemistry , crystal structure , molecule , condensed matter physics , physics , optics , organic chemistry , chromatography , astronomy , composite material
Three absorption peaks (620 to 640, 590, 550 to 580 cm −1 ) are observed in the IR spectra of YBa 2 Cu 3 O x . The variation of intensity and frequency of these peaks with annealing temperature and oxygen content is investigated. The nature of IR peaks is studied and assignment to various CuO bond‐stretching vibrations is made and supported by the correspondence between peak frequency and appropriate CuO bond‐length. Based upon the correlation between peak intensity and oxygen content, these peaks are further interpreted as “quasilocalized” vibration mode of the CuO bond induced by the oxygen‐vacancy in the one‐dimensional CuO chain and two‐dimensional CuO network. The corresponding vacancy formation energy is found to be 0.34 and 0.93 eV, respectively. These peaks may serve as an useful indicator of oxygen content, crystal structure, and superconducting properties of YBa 2 Cu 3 O x .