The influence of grain boundary on the conductivity of donor doped SrTiO3

Fumimasa Horikiri, Li Qun Han, Atsushi Kaimai, Takanori Otake, Keiji Yashiro, Tatsuya Kawada, Junichiro Mizusaki

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15 Citations (Scopus)

Abstract

The electrical conductivity of polycrystalline Sr(Ti0.999Nb0.001)O3 was investigated. The conductivity was smaller by 1-2 order than that of the single crystal. The conductivity increased with temperature with the activation energy of 0.61 eV. The distribution of grain boundary nature of the polycrystalline sample was determined by Orientation Imaging Microscope (OIM) analysis. The ratio of coincident lattice boundaries was determined to be approximately 20%. The impedance of bicrystals across the grain boundary with different grain boundary type was measured. The grain boundary impedance was found to consist of two RC parallel components in series. The activation energies of them were 0.56-0.71 eV and 1.73-1.97 eV, respectively. These two processes were assigned to the grain boundary or annealed surface layer and the Schottky barrier between the bulk and the surface or the grain boundary layer. A possible conduction mechanism of polycrystalline material was considered that of the three dimensional network of the grain boundary layer.

Original languageEnglish
Pages (from-to)2555-2559
Number of pages5
JournalSolid State Ionics
Volume177
Issue number26-32 SPEC. ISS.
DOIs
Publication statusPublished - 2006 Oct 31

Keywords

  • Grain boundary
  • Poly crystal
  • Single crystal
  • SrTiO

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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