Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Synthesis of High-Aspect-Ratio BaTiO3 Platelets by Topochemical Conversion and Fabrication of Textured Pb(Mg1/3Nb2/3)O3-32.5PbTiO3 Ceramics

  • Zhao, Wei (Tianjin Institute of Urban Construction, Department of Materials science & Engineering) ;
  • E, Lei (Tianjin Institute of Urban Construction, Department of Materials science & Engineering) ;
  • Ya, Jing (Tianjin Institute of Urban Construction, Department of Materials science & Engineering) ;
  • Liu, Zhifeng (Tianjin Institute of Urban Construction, Department of Materials science & Engineering) ;
  • Zhou, Heping (State Key Laboratory of New Ceramic and Fine Processing, Tsinghua University)
  • Received : 2012.02.18
  • Accepted : 2012.04.16
  • Published : 2012.07.20
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Abstract

Perovskite structured barium titanate particles ($BaTiO_3$) platelets were synthesized by molten salt synthesis and topochemical microcrystal conversion. As the precursors of $BaTiO_3$, plate-like $BaBi_4Ti_4O_{15}$ particles were first synthesized by the reaction of $Bi_4Ti_3O_{12}$, $BaCO_3$, and $TiO_2$ at $1080^{\circ}C$ for 3 h in $BaCl_2$-KCl molten salt. After the topochemical reactions, layer-structured $BaBi_4Ti_4O_{15}$ particles transformed to the perovskite $BaTiO_3$ platelets. $BaTiO_3$ particles with thickness of approximately $0.5{\mu}m$ and a length of $10-15{\mu}m$ retained the morphology feature of the $BaBi_4Ti_4O_{15}$ precursor. For <001> $Pb(Mg_{1/3}Nb_{2/3})O_3-32.5PbTiO_3$ (PMNT)-5 wt % PbO piezoelectric ceramics textured with 5 vol % of $BaTiO_3$ templates, the Lotgering factor reached 0.82, and $d_{33}$ was 870 pC/N.

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References

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