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1 results

  • Rietveld analysis of mechanically activated BaCO3–TiO2 system

  • Márcio de Sousa Góes, José Arana Varela, Carlos de Oliveira Paiva-Santos, Biljana D. Stojanovic, André Vitor Chaves de Andrade
  • Journal:
    Powder Diffraction / Volume 23 / Issue S1 / March 2008
    Published online by Cambridge University Press:
    06 March 2012, pp. S13-S17

  • BaTiO3 powders were prepared through mechanical activation chemistry and analyzed by Rietveld refinement with X-ray diffraction data. Raw BaCO3 and TiO2 powders were dry milled for 5 and 20 h and then calcinated for 2 and 4 h at 800 °C. The milling process was found to have broken up the BaCO3 and TiO2 crystals into smaller crystals and formed only small amounts (<1.5 wt%) of BaTiO3. Subsequence calcinations for 2 and 4 h at 800 °C successfully produced large amounts (>97.7 wt%) of BaTiO3 crystals. The calcination process also generated microstrains and crystallite-size anisotropy in BaTiO3. An increase in the calcination time from 2 to 4 h increased the BaTiO3 weight percentage and the crystallite-shape anisotropy, but decreased the tetragonal distortion anisotropic microstrains in BaTiO3 crystals.