Changes in the chemical state of monocrystalline SrTiO3 surface by argon ion bombardment

Yuji Adachi, Shigemi Kohiki, Kazuaki Wagatsuma, Masaoki Oku

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30 Citations (Scopus)


High-resolution X-ray photoemission spectroscopy (XPS) of single crystalline SrTiO3, SrTiO3:La and SrTiO3:Nb fractured in situ in ultrahigh vacuum (UHV) with Ar+ bombardment revealed that the bombardment caused reduction of Ti+4, Sr+2, La+3 and Nb+5 to the lower valence states at surfaces. Formation of Ti+3 state can be ascribed to the partial occupation of the conduction band; some electrons transfer into Ti 3d band due to the lack of O 2p states. Similarly, the partial occupation of the La 5d orbitals due to the lack of O 2p states was observed for the bombarded SrTiO3:La surface. Loss of surrounding oxygen due to the bombardment also resulted in the states of Nb+3 and Sr0 at the surfaces. To our knowledge, there was no report on reduction of Sr+2, La+3 and Nb+5 in SrTiO3, SrTiO3:La and SrTiO3:Nb.

Original languageEnglish
Pages (from-to)272-276
Number of pages5
JournalApplied Surface Science
Issue number1
Publication statusPublished - 1999 Apr

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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