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MSr2Y1.5Ce0.5Cu2Oz (M-1222) compounds, with M = Fe and Co, have beensynthesized through a solid-state reaction route. Both compounds crystallize ina tetragonal structure (space group I4/mmm). A Rietveld structural refinementof room-temperature neutron diffraction data for Fe-1222 reveals that nearlyhalf the Fe remains at the M site, while the other half goes to the Cu site inthe CuO2 planes. Existence of Fe at two different lattice sites, is alsoconfirmed by 57Fe Mossbauer spectroscopy from which it is inferred that nearly50% of the total Fe occupies the Cu site in the CuO2 planes as Fe3+, whereasthe other 50 % is located at the M site with nearly 40 % as Fe4+ and around 10%as Fe3+. For the M = Co compound, nearly 84 % of Co remains at its designated Msite, while the rest occupies the Cu site in the CuO2 planes. The oxygencontent, z, based on oxygen occupancies refined from the neutron diffractiondata, comes close to 9.0 for both the samples The ZFC and FC magnetizationcurves as a function of temperature show a complex behavior for both Fe-1222and Co-1222 compounds.Comment: MMM Inter mag Proceedings, accepted in J. Appl. Phy

Structural and magnetic properties of MSr2Y1.5Ce0.5Cu2Oz (M-1222) compounds with M=Fe and Co