Bulletin of the Korean Chemical Society

  • 제17권2호
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  • Pages.168-172
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  • 1996
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  • 0253-2964(pISSN)
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  • 1229-5949(eISSN)
대한화학회 (Korean Chemical Society)
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Correlation between Structures and Ionic Conductivities of $Na_2Ln_2Ti_3O_{10}$ (Ln=La, Nd, Sm, and Gd)

  • 발행 : 19960200
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초록

The variations of the structural detail of layered perovskite-type oxides, Na2Ln2Ti3O10 (Ln=La, Nd, Sm, Gd), have been refined by Rietveld analyses of their powder X-ray diffraction data. Although the c-axis strongly decreases from Ln=La to Nd, Sm, or Gd, the length of Na-O bond along the c-axis that is regarded as the sodium layer spacing is not dependent on the unit cell parameter. Such a behavior is explained by the fact that Na-O bond is in competition with Ti-O one of the perovskite slab. Increased covalency of this Ti-O bond by the lattice contraction leads to weakening of the attaching strength of Na ion. This picture is consistent with the experimental observation that Na ion conductivity of Na2Ln2Ti3O10 increases from Ln=La to Nd, Sm, or Gd despite strong contraction of the unit cell volume.

키워드

참고문헌

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피인용 문헌

  1. Correlation between Structure and Ionic Conductivity in Layered Perovskite Oxides, LiLnTa2O7 (Ln=La, Nd, Sm) vol.311, pp.1, 1996, https://doi.org/10.1080/10587259808042421
  2. Formation of the complex oxide NaNdTiO4 vol.34, pp.6, 1996, https://doi.org/10.1134/s1087659608060126