TY - JOUR
T1 - Influence of molybdenum species on growth of anodic titania
AU - Habazaki, H.
AU - Uozumi, M.
AU - Konno, H.
AU - Shimizu, K.
AU - Nagata, S.
AU - Asami, K.
AU - Skeldon, P.
AU - Thompson, G. E.
N1 - Funding Information:
Thanks are due to Y. Uchida of the Horiba Company, Tokyo, Japan for the provision of time on Jobin Yvon RF5000 GDOES instrument, and to K. Saito of the Institute for Materials Research, Tohoku University for ion implantation. The present work was supported in part by Grant-in Aid for Scientific Research (C) No. 13650770 from the Japan Society for Promotion of Science as well as the Light Metal Educational Foundation, Inc.
PY - 2002/9/12
Y1 - 2002/9/12
N2 - 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.
AB - 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.
KW - Anodic films
KW - Anodising
KW - Rutherford backscattering spectroscopy
KW - Titanium
KW - Transmission electron microscopy
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U2 - 10.1016/S0013-4686(02)00319-5
DO - 10.1016/S0013-4686(02)00319-5
M3 - Article
AN - SCOPUS:0037068599
VL - 47
SP - 3837
EP - 3845
JO - Electrochimica Acta
JF - Electrochimica Acta
SN - 0013-4686
IS - 24
ER -