EXAFS investigations of Cu-Mg-O compound

The interest to systems containing copper oxide is connected with the probl em of high-temperature superconductivity because of the closeness of its ba sic physical properties and properties of superconductor mother Cu-compound s. In this work, EXAFS study of the Cu0.2Mg0.8O Compound is presented. A ne w iterative algorithm of the solution of ill-posed problem on determining t hree partial pair correlation functions from one EXAFS-data set near the Cu K-edge is described. The results of X-ray scattering study of a given samp le show a presence of a single phase with the MgO structure and a lattice p arameter of 4.219 Angstrom instead of 4.208 Angstrom for pure MgO. From the EXAFS investigations, we find the local distortion of the lattice. We reve aled that the short range order differs both from a hypothetical alloy with the MgO structure and from copper oxide. (C) 2001 Elsevier Science B.V. Al l rights reserved.