STRUCTURAL, MOSSBAUER AND RAMAN STUDIES OF THE (Y,CE)(2)SR2CU2FEO8+Y COMPOUND

The crystal structure and physical properties for (Y,Ce)(2)Sr2Cu2FeO8y compound are reported using Rietveld refinement of x-ray powder-diff raction data, de magnetic susceptibility, Mossbauer, and Raman spectro scopy measurements. Mossbauer data can be analyzed with three componen ts. Component A is attributed to Fe3+ (S = 5/2) ions in the Cu(2) site . Component B is attributed to Fe3+ (S = 3/2) ions in the Cu(1) plane and appears only in the oxygen saturated sample. For the reduced sampl e, component B transforms to component D-r, which has a lower oxygen c oordination number with respect to that of component B. The Raman line s are assigned to definite atomic vibrations in close comparison with other compounds of similar structure.