Abstract
The reaction of Y/Eu, Cu, Fe oxides and Ba carbonate in a ratio of 1:2:1:2 at 980°C in an oxygen current forms double-phase systems; in each system, the major phase is a 123 type orthorhombic three-layered structure, and the secondary phase, amounting to about one-third of the major phase, is a tetragonal, nearly pseudocubic 123 structure. Both phases in the yttrium and europium systems are characterized by formation of weak superstructures with doubled parameters of the ordinary three-layered cell. In each system, the two phases seem to differ in the content and distribution of iron. Based on the gamma resonance data, it is concluded that ∼2/3 of iron atoms occupy Cu(2) positions in the form of Fe3+ and are magnetically ordered at room temperature. The other Fe atoms occupy Cu(1) positions with different coordinations; some of the octahedrally coordinated Fe3+ ions in Cu(1) positions (major part in the case of the Eu system) are magnetically ordered, probably, under the influence of magnetic ordering in Cu(2) sublattices containing Fe3+ ions.
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