Reaction and precipitation mechanism in the low-temperature aqueous synthesis of BaTiO3 (Contributo in volume (capitolo o saggio))

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Label
  • Reaction and precipitation mechanism in the low-temperature aqueous synthesis of BaTiO3 (Contributo in volume (capitolo o saggio)) (literal)
Anno
  • 2002-01-01T00:00:00+01:00 (literal)
Alternative label
  • Viviani M.; Buscaglia M.T.; Buscaglia V.; Piaggio, P.; Nanni P.; Bowen P. (2002)
    Reaction and precipitation mechanism in the low-temperature aqueous synthesis of BaTiO3
    American ceramic society, Westerville, Ohio (Stati Uniti d'America) in Dielectric Materials and Devices, 2002
    (literal)
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  • Viviani M.; Buscaglia M.T.; Buscaglia V.; Piaggio, P.; Nanni P.; Bowen P. (literal)
Pagina inizio
  • 25 (literal)
Pagina fine
  • 33 (literal)
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  • Dielectric Materials and Devices (literal)
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  • Institute for Physical Chemistry of Materials - National Research Council Via De Marini, 6 I-16149 Genoa, Italy; Chemical and Process Engineering Department - University of Genoa P.le Kennedy, Pad. D I-16129 Genoa, Italy; Chemistry Department - University of Genoa Via Dodecaneso, 31 I-16100 Genoa, Italy; Powder Technology Laboratory, Materials Department Swiss Federal Institute of Technology Lausanne (EPFL) CH-1015 Lausanne, Switzerland (literal)
Titolo
  • Reaction and precipitation mechanism in the low-temperature aqueous synthesis of BaTiO3 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#isbn
  • 1574981188 (literal)
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  • K.M. Nair; Amar S. Bhalla; Tapan K. Gupta; Shin-Ichi Hirano; Basavaraj V. Hiremath (literal)
Abstract
  • In past years it has been demonstrated the possibility to obtain nanosized powders of Barium Titanate by precipitation in aqueous medium through the reaction Ba(OH)2 + TiCl4 + 4NaOH -> BaTiO3 + 4NaCl + 3H2O carried out at atmospheric pressure and 80 °C. In this work, the precipitation process was studied by means of X-ray diffraction, specific surface area measurements and scanning electron microscopy. Two different mechanisms of precipitation and crystallisation are reported, depending on the concentration of cationic species. In particular, [Ba2+] plays a critical role. For concentrations higher than 0.11 M the reaction leads directly to fully crystalline round-shaped particles with size in the range 20-50 nm. At [Ba2+] = 0.06M the product is an amorphous Ti-rich precipitate (Ba/Ti = 0.4) which slowly transforms into faceted BaTiO3 particles by a dissolution-precipitation process. This conclusion is supported by SEM observation of the particle size and morphology, which are incompatible with in-situ transformation. For intermediate concentrations, amorphous and crystalline phases coexist in the precipitate. (literal)
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