Abstract
The incorporation of strontium and the variation of oxygen content in compounds of the type Eu 2SrCu 2O 6 can alter the cationic oxidation states and influence the conductivity of the materials. The value of δ in the semiconducting compound Eu 1.3Sr 1.7Cu 2O 6−δ has been estimated by thermogravimetric analysis as 0.35. 151Eu Mössbauer spectroscopy shows that europium is present as Eu 3+. Europium L III-edge and copper K-edge EXAFS are consistent with the ordered anionic vacancies creating a one-dimensional tunnelled oxygen sublattice and with the partial occupation by strontium of some of the lanthanide sites.
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