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(Fe 0.5 Nb 0.5 )O 3 (PFN)] x -[Cr 0.75 Fe 1.25 O 3 (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 57 Fe Mössbauer 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 Mössbauer 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 (δ) = 0.21 mm/s) was detected. For the composite sample, the δ and Δ are typical of Fe ions at sites of octahedral coordination.