1. Structural studies of a new electroceramic composite: Pb(Fe0.5Nb0.5)O3 (PFN)-Cr0.75Fe1.25O3(CRFO).
- Author
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Freire, F. N. A., Rocha, H. H. B., Santos, M. R. P., Fechine, P. B. A., Pereira, F. M. M., Sohn, R. S. T. M., Vasconcelos, I. F., and Sombra, A. S. B.
- Subjects
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CERAMICS , *THERMOSETTING composites , *POLYCRYSTALLINE semiconductors , *SCANNING electron microscopy , *X-ray diffraction , *MOSSBAUER spectroscopy , *RIETVELD refinement , *MICROSTRUCTURE , *MATERIALS science - Abstract
A study of the structural characteristics of the composites [Pb(Fe0.5Nb0.5)O3(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 57Fe 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. [ABSTRACT FROM AUTHOR]
- Published
- 2008
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