Mechanisms of multi-component perovskite synthesis from stoichiometric mixtures by a soft-mechanochemical route

J. G. Baek, K. Gomi, T. Watanabe, T. Isobe, M. Senna

研究成果: Article

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Mechanism of complex formation by milling a mixture comprising PbO, TiO2, Nb2O5 and Mg(OH)2 was examined. Due to the strong acidity of Nb2O5 and basicity of Mg(OH)2, a typical acid-base reaction takes place during milling with simultaneous partial reduction of Nb5+ to Nb2+, as evidenced by XPS. This mechanochemical reaction, together with further interaction with PbO and TiO2, brings about precursors of the perovskite solid solution, (1-X)Pb(Mg1/3Nb2/3)O3-xPbTiO3 with x ranging from 0 to 0.2. The mixture after milling is more homogeneous and contains even a small amount of crystalline perovskite. On subsequent heating, growth of perovskite takes place parallel with a solid state reaction via pyrochlore, resulting in a pure perovskite phase at temperatures as low as 850°C. A mixture without mechanical stressing brings about a pyrochlore as a main phase by heating under the same condition.

元の言語English
ページ(範囲)115-120
ページ数6
ジャーナルMaterials Science Forum
235-238
発行部数PART 1
出版物ステータスPublished - 1997 12 1

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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