Influence of molybdenum species on growth of anodic titania

H. Habazaki, M. Uozumi, H. Konno, K. Shimizu, S. Nagata, K. Asami, P. Skeldon, G. E. Thompson

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

Ti-Mo, bcc, solid-solution alloys, containing 11.5-37.0 at.% molybdenum, have been anodised galvanostatically in 0.1 mol dm-3 ammonium pentaborate and 1.0 mol dm-3 phosphoric acid electrolytes, with resultant anodic films characterised by scanning electron microscopy, transmission electron microscopy, Rutherford backscattering spectroscopy and glow discharge optical emission spectroscopy. Uniform amorphous films are formed at high current efficiency to > 100 V, with formation ratios of 2.3 and 2.2 nm V-1 in the respective electrolytes, contrasting with the amorphous-to-crystalline transition of anodic titania on titanium that occurs at ∼ 20-50 V. Apart from minor incorporation of electrolyte species, the films comprise an outer layer of TiO2 and an inner oxide layer containing Ti4+ and Mo6+ ions. The films grow by migration of both cations and anions, with Ti4+ ions migrating faster than Mo6+ ions that is related to the energies of Ti4+-O and Mo6+-O bonds.

Original languageEnglish
Pages (from-to)3837-3845
Number of pages9
JournalElectrochimica Acta
Volume47
Issue number24
DOIs
Publication statusPublished - 2002 Sep 12

Keywords

  • Anodic films
  • Anodising
  • Rutherford backscattering spectroscopy
  • Titanium
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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