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Chemical states of Sm doped layered perovksite, SmBa1−xSrxCo2O5+d (x=0 and 0.5), have been investigated by X-ray Photoelectron Spectroscopy (XPS). Substitution of Sr in SmBa1−xSrxCo2O5+d oxide system shifts the binding energy of Sm 3d5/2 to the more positive side and the charge state of Sm remained Sm3+. Therefore, the substitution of Sr into the SmBa1–xSrxCo2O5+d oxide system does not change the...
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