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Various MSr2YCu2Oz (M1212 with M = Fe, Co, Al and Ga) compounds have beensynthesized through a solid state reaction route. All these compounds arederived from the basic CuBa2YCu2O7 structure. Rietveld structural refinement ofthe room-temperature neutron diffraction data for Fe-1212 reveals that nearlyhalf of Fe remains at the M site, while the other half goes to the Cu site inthe CuO2 plane. For the M = Co, Al and Ga compounds, the basic unit cell getsdoubled due to two distinct M sites in the M-O layer and the space group Ima2,without any cation intermixing is found more appropriate. For the M = Fesample, magnetic ordering of Fe spins is seen from magnetization data below 70K. In the case of the M = Co compound, a shallow down-turn in magneticsusceptibility is seen below 150 K, indicating low dimensional magneticcharacteristics of the CoO layer. The compounds with M = Al and Ga showparamagnetic behaviour in their magnetization data down to 5 K. The oxygencontent, established for each compound based on oxygen occupancies, refinedfrom the neutron diffraction data comes close to 7.0 for each.Comment: Text with Figs, Submitted 47th MMM conf. US

Cation intermixing and ordering phenomenon in M–O layer of MSr2YCu2Oz (M-1212) compounds with M=Fe, Co, Al, and Ga: A neutron powder diffraction study