XPS study on the preferential site occupations of Bi, Sr and Ca ions in Bi2Sr2CaCu2O8+d superconductors prepared by LPE method

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Abstract

XPS measurements were performed on the Bi2Sr2CaCu2O8+d system prepared by the LPE method using melts with compositions Bi:Sr:Ca:Cu = (2 − x) : 2 : (1 + x) : 2 for 0 ≤ x ≤ 0.2. The peak decompositions of Sr3d and Ca2p XPS spectra, together with the EPMA results, elucidated the occupancies of Bi, Sr and Ca atoms on the BiO-, SrO- and Ca-layers. The x dependences of the lattice parameter c and the superconducting critical temperature Tc are explained by the changes of the excess oxygens in the BiO layer.

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