Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Crystal Structure of High Temperature Phase in ${Bi_2}{O_2}$-layered Perovskites ${ABi_2}{M_2}{O_9}$(A=Pb, Sr, M=Nb, Ta)

  • Kim, Jeong-Seog (Department of Materials Science and Engineering, Hoseo University) ;
  • Cheon, Chae-il (Department of Materials Science and Engineering, Hoseo University) ;
  • Lee, Chang-Hee (Department of Neutron Physics, Hanaro Center, KAERI) ;
  • Choo, Woong-Gil (Department of Materials Science and Engineering, KAIST)
  • Published : 2001.11.01
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Abstract

Crystal structure of PbBi$_2$Nb$_2$$O_{9}$ and $Sr_{1.2}$$Bi_{1.8}$Ta$_2$$O_{9}$ were determined by Rietveld method using neutron diffraction data in the temperature range of 300 K~1273K. Phase transition temperature were measured from the dielectric permittivitytemperature curve. The PbBi$_2$Nb$_2$$O_{9}$ showed a phase transition at about 810 K. In the Sr-excess compound $Sr_{1.2}$$Bi_{1.8}$Ta$_2$$O_{9}$ the phase transition was suppressed down to room temperature. Several structural models were tested by the Rietiveld refinement. Based on the \`R\` values and the structural parameters, the B2cb model is judged to be the most feasible one for the high temperature phase at above 810 K of the PbBi$_2$Nb$_2$$O_{9}$. The $Sr_{1.2}$$Bi_{1.8}$Ta$_2$$O_{9}$ sample was refined to show the most reliable results by the Am2m model.sults by the Am2m model.

Keywords

References

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