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

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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.

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Acknowledgements

This work was partly sponsored by CAPES, FUNCAP and CNPq (Brazilian agencies) and the US Air Force Office of Scientific Research (AFOSR) (FA9550-06-1-0543).

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Authors and Affiliations

  1. Departamento de Química Orgânica e Inorgânica, Universidade Federal do Ceará, Fortaleza, Ceara, CEP 60455-760, Brazil

    F. N. A. Freire, P. B. A. Fechine & F. M. M. Pereira

  2. Departamento de Engenharia de Teleinformática, Universidade Federal do Ceará, Fortaleza, Ceara, CEP 60455-970, Brazil

    H. H. B. Rocha

  3. Laboratório de Telecomunicações e Ciência e Engenharia dos Materiais (LOCEM), Departamento de Física, Universidade Federal do Ceará, Caixa Postal 6030, Fortaleza, Ceara, CEP 60455-760, Brazil

    F. N. A. Freire, H. H. B. Rocha, M. R. P. Santos, P. B. A. Fechine, F. M. M. Pereira, R. S. T. M. Sohn & A. S. B. Sombra

  4. Departamento de Engenharia Metalúrgica e de Materiais, Universidade Federal do Ceará, Fortaleza, Ceara, CEP 60455-760, Brazil

    I. F. Vasconcelos

  5. Faculdade de Educação, Ciências e Letras do Sertão Central–Curso de Química, Universidade Estadual do Ceará, Quixadá, Ceara, CEP 63900-000, Brazil

    F. N. A. Freire

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  1. F. N. A. Freire
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  2. H. H. B. Rocha
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  3. M. R. P. Santos
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  7. I. F. Vasconcelos
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  8. A. S. B. Sombra
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Correspondence to A. S. B. Sombra.

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Freire, F.N.A., Rocha, H.H.B., Santos, M.R.P. et al. Structural studies of a new electroceramic composite: Pb(Fe0.5Nb0.5)O3 (PFN)-Cr0.75Fe1.25O3(CRFO). J Mater Sci 43, 75–82 (2008). https://doi.org/10.1007/s10853-007-2091-y

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  • DOI: https://doi.org/10.1007/s10853-007-2091-y

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