Abstract
In the past few years the magnetic and electronic properties of iridium-containing perovskites have attracted considerable interest [1-6], because of the wide fange of variation giving behaviour ranging from semiconducting to metallic, frequently associated with cooperative magnetic properties. Special interest has been focused on the stabilization of unusual oxidation states of some transition-metal cations. In this context, various examples of perovskites in which the Ir s+ cation may be stabilized in an octahedral coordination have been reported [68]. The existence of some stoichiometric phases Ba2LnIrO 6 was initially reported by Thumm et al. [9] and the symmetry of these rare-earth mixed oxides was found to be cubic, whereas the indium analogue was hexagonal. More recently, Lang and Muller [10] have studied a hexagonal phase of a europium-containing perovskite. This letter reports the synthesis, structural characterization from powder X-ray diffraction (XRD) data and study of electronic properties, made from conductivity and Seebeck coefficient measurements, for Ba2LnIrO6 (Ln = La, Ce, Pr, Eu, Ho, Er, Yb, Lu) perovskites.
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