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Processing of submicrometric CaTi0.8Fe0.2O3-δ ceramics by mechanical activation

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Abstract

Effects of mechanical activation of precursors in order to obtain CaTi0.8Fe0.2O3-δ are reported. Mixtures of CaCO3, TiO2 and Fe2O3 were dry-grinded in Teflon or zirconia containers using planetary ball-mills at different rotations (200, 300 and 500 rpm) and for various periods of time. The perovskite is not formed just by milling and a subsequent heat treatment at 800–1,000 °C was necessary. This still represents a significant advantage over the classical ceramic route as a result of the improved reaction kinetics due to the smaller grain size (<100 nm) of the activated powders and a modification of the thermodynamic initial state. Dense ceramic samples showing a bimodal submicrometric grain-size distribution (100–200 and 250–500 nm) were obtained after sintering the activated powders at 1,150 °C TEM revealed homogeneous samples, free from inhomogeneities such as core-shell grains typically observed in ceramics obtained from non-activated precursors sintered at 1,320–1,350 °C.

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Acknowledgements

This work was supported by the FCT (POCI/CTM/59727/2004), Portugal. E. Chinarro was awarded a Marie Curie fellowship of the European Community Programme IHP under contract number HPMT-CT-2000-00206.

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Authors and Affiliations

  1. Department of Ceramics and Glass Engineering, CICECO, University of Aveiro, 3810-193, Aveiro, Portugal

    R. O. Fuentes, E. Chinarro, F. M. Figueiredo, F. M. B. Marques & J. R. Frade

  2. CINSO-CITEFA-CONICET, J.B. de la Salle 4397, B1603ALO Villa Martelli, Buenos Aires, Argentina

    R. O. Fuentes

  3. Science and Technology Dep., Universidade Aberta, R. da Escola Politécnica 147, 1269-001, Lisbon, Portugal

    F. M. Figueiredo

  4. Laboratório Central de Análises, University of Aveiro, 3810-193, Aveiro, Portugal

    R. Soares

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  1. R. O. Fuentes
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  2. E. Chinarro
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  3. F. M. Figueiredo
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  4. R. Soares
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  5. F. M. B. Marques
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  6. J. R. Frade
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Correspondence to F. M. Figueiredo.

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Fuentes, R.O., Chinarro, E., Figueiredo, F.M. et al. Processing of submicrometric CaTi0.8Fe0.2O3-δ ceramics by mechanical activation. J Mater Sci 41, 7393–7400 (2006). https://doi.org/10.1007/s10853-006-0812-2

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  • DOI: https://doi.org/10.1007/s10853-006-0812-2

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