Structural studies of a new electroceramic composite:: Pb(Fe0.5Nb0.5)O3 (PFN)-Cr0.75Fe1.25O3(CRFO)

A study of the structural characteristics of the composites [Pb(Fe0.5Nb0.5)O-3(PFN)] (x) -[Cr0.75Fe1.25O3(CRFO)](100-x) (x = 0 (CRFO100), 10, 50, 90, 100) was performed in this work. The compounds PFN100 and CRFO100 were prepared by conventional solid-state method and investigated by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Fe-57 Mossbauer Spectroscopy techniques. The X-ray analysis shows that PFN100 is tetragonal and the CRFO100 phase has a trigonal symmetry. The refinement of all the composites was also performed and discussed in this paper. The Mossbauer spectrum for the composite samples shows a paramagnetic doublet and a sextet probably assigned to a magnetic phase associated to Fe+3. For the sample PFN100, only a magnetic field of 49.5 T (isomer shift (delta) = 0.21 mm/s) was detected. For the composite sample, the delta and delta are typical of Fe ions at sites of octahedral coordination.