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

Published online by Cambridge University Press:  31 January 2011

M. T. Buscaglia ,
M. Leoni ,
M. Viviani ,
V. Buscaglia ,
A. Martinelli ,
A. Testino  and
P. Nanni
M. T. Buscaglia
Affiliation:
Institute for Energetics and Interphases, National Research Council, via De Marini 6, I-16149 Genoa, Italy
M. Leoni
Affiliation:
Institute for Energetics and Interphases, National Research Council, via De Marini 6, I-16149 Genoa, Italy
M. Viviani
Affiliation:
Institute for Energetics and Interphases, National Research Council, via De Marini 6, I-16149 Genoa, Italy
V. Buscaglia*
Affiliation:
Institute for Energetics and Interphases, National Research Council, via De Marini 6, I-16149 Genoa, Italy
A. Martinelli
Affiliation:
Department of Chemistry and Industrial Chemistry, via Dodecaneso 31, I-16146 Genoa, Italy
A. Testino
Affiliation:
Department of Process and Chemical Engineering, University of Genoa, Fiera del Mare, Pad. D., I-16146 Genoa, Italy
P. Nanni
Affiliation:
Department of Process and Chemical Engineering, University of Genoa, Fiera del Mare, Pad. D., I-16146 Genoa, Italy
*
a)Address all correspondence to this author. e-mail: buscaglia@icfam.ge.cnr.it
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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.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 3 , March 2003 , pp. 560 - 566
Copyright
Copyright © Materials Research Society 2003

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