Abstract
We have studied the evolution of the diffuse reflectance spectra of YBa2Cu3O7−x powders with 0.1≤x≤∼1.0 in the spectral interval of 0.5 eV≤hν≤6.0 eV. Combination of the optical spectroscopy with thermal desorption measurements revealed a band at 1.25 eV that reversibly varied in the redox cycle. This band, assigned to interband absorption in the CuO2 planes with low coordination of Cu(2), can be used for in situ monitoring of the degree of oxidation of YBa2Cu3O7−x powders with x≥0.5.
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