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Synthesis and characterization of BaSn(OH)6 and BaSnO3 acicular particles

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Abstract

The synthesis of BaSn(OH)6 acicular crystals by precipitation at 100 °C from aqueous solutions and their transformation in the perovskitelike compound BaSnO3 was investigated. Single acicular crystals 100–200 μm in length were obtained from a 0.05M solution, whereas bundlelike aggregates of 20–40 μm were precipitated from 0.2–0.6 M solutions. The x-ray diffraction pattern of barium hexahydroxostannate was indexed according to monoclinic symmetry with cell parameters a = 11.029 ± 0.002 Å, b = 6.340 ± 0.001 Å, c = 10.563 ± 0.001 Å = 128.51 ± 0.01°, α = γ = 90°. The BaSn(OH)6 particles decomposed to BaSnO3 and water at approximately 270 °C and the original morphology was retained. The resulting product had specific surface area up to 30–40 m2/g and consisted of 10–20 nm crystallites. The larger unit cell edge in comparison to the reference value and the continuous weight loss up to 1200 °C indicate that water is not completely released during decomposition and a substantial amount of proton defects (up to 0.4 mol per mole of BaSnO3) is incorporated in the perovskite lattice as OH− groups. Normal crystallographic properties of BaSnO3 are restored only after calcination at 1300 °C.

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Authors and Affiliations

  1. Institute for Energetics and Interphases, National Research Council, via De Marini 6, Genoa, I-16149, Italy

    M. T. Buscaglia, M. Leoni, M. Viviani & V. Buscaglia

  2. Department of Chemistry and Industrial Chemistry, via Dodecaneso 31, I-16146, Genoa, Italy

    A. Martinelli

  3. Department of Process and Chemical Engineering, University of Genoa, Fiera del Mare, Pad. D., I-16146, Genoa, Italy

    A. Testino & P. Nanni

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  1. M. T. Buscaglia
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  2. M. Leoni
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  3. M. Viviani
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  4. V. Buscaglia
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  6. A. Testino
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  7. P. Nanni
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Correspondence to V. Buscaglia.

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Buscaglia, M.T., Leoni, M., Viviani, M. et al. Synthesis and characterization of BaSn(OH)6 and BaSnO3 acicular particles. Journal of Materials Research 18, 560–566 (2003). https://doi.org/10.1557/JMR.2003.0072

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  • DOI: https://doi.org/10.1557/JMR.2003.0072

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