The energy level of the Fe2+/3+-transition in BaTiO3 and SrTiO3 single crystals

Issei Suzuki, Leonard Gura, Andreas Klein

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

An approach to determine the defect energy levels of the Fe impurities in BaTiO3 and SrTiO3 single crystals using electrical conductance measurements is presented. The defect levels are obtained from the dependence of the activation energy of electrical transport on the oxygen vacancy concentration, which is varied by stepwise re-oxidation of a reduced sample. An energy level at 0.7-0.8 eV below the conduction band minimum ECB is identified for BaTiO3, which can be assigned to the Fe2+/3+-transition in good agreement with literature. In contrast, the conductivity of Fe-doped SrTiO3 does not show a defect energy level in the upper half of the band gap, indicating that the Fe2+/3+-transition in SrTiO3 is near the conduction band minimum. The often reported alignment of defect energy levels, which is fulfilled for the Fe3+/4+-transition in BaTiO3 and SrTiO3, does not hold for the Fe2+/3+-transition in these compounds. This limits the applicability of Fe-doped SrTiO3 as a model system for studying resistance degradation in acceptor-doped high-permittivity dielectrics.

Original languageEnglish
Pages (from-to)6238-6246
Number of pages9
JournalPhysical Chemistry Chemical Physics
Volume21
Issue number11
DOIs
Publication statusPublished - 2019 Jan 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Fingerprint Dive into the research topics of 'The energy level of the Fe<sup>2+/3+</sup>-transition in BaTiO<sub>3</sub> and SrTiO<sub>3</sub> single crystals'. Together they form a unique fingerprint.

  • Cite this