Non-linear current-voltage property across Σ5(210) symmetric tilt boundary in Nb-doped SrTiO3 bicrystal

Masaru Nishi, Tomohito Tanaka, Katsuyuki Matsunaga, Yuichi Ikuhara, Takahisa Yamamoto

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Grain boundary structure and current-voltage (I-V) characteristics were investigated for Σ5(210) symmetrical tilt boundary of a Nb-doped SrTiO3 bicrystal. The bicrystal was prepared by a hot-joining technique at high temperature in air. The high resolution transmission electron microscopy (HRTEM) study has revealed that the grain boundaries were perfectly joined at an atomic level without intergranular phases such as amorphous or secondary precipitates. In spite of the high coherency, the boundary tends to be faceted with low index planes of (110) and (410) to reduce grain boundary energy. On the other hand, the I-V property across the boundary was found to exhibit a cooling rate dependency from annealing temperature. In addition, the dependency shows a peak against cooling rates. This fact suggests that the non-linearity in I-V relation is dominantly controlled by a non-equilibrium process of a defect reaction.

Original languageEnglish
Pages (from-to)2112-2116
Number of pages5
JournalMaterials Transactions
Volume45
Issue number7
DOIs
Publication statusPublished - 2004 Jul
Externally publishedYes

Keywords

  • Double schottky barrier
  • Grain boundary
  • Point defect
  • SrTiO

ASJC Scopus subject areas

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

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