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X-ray photoelectron spectra show changes in the valence bands accompanying the temperature-dependent semiconductor-metal transition in La 2 NiO 4 and the localized-itinerant electron transitions in LaCoO 3 and YCoO 3 . In La 1-x Sr x CoO 3 the valence band changes with the variable x in a manner reflecting the known changes in electronic properties.
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Thornton et al. (1976) studied this question.
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