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Characteristics of titanium oxide films deposited by an activated reactive evaporation method

Published online by Cambridge University Press:  03 March 2011

Tatsuo Fujii ,
Naoki Sakata ,
Jun Takada ,
Yoshinari Miura ,
Yoshihiro Daitoh  and
Mikio Takano
Tatsuo Fujii
Affiliation:
Department of Applied Chemistry, Okayama University, Tsushima-naka, Okayama 700, Japan
Naoki Sakata
Affiliation:
Department of Applied Chemistry, Okayama University, Tsushima-naka, Okayama 700, Japan
Jun Takada
Affiliation:
Department of Applied Chemistry, Okayama University, Tsushima-naka, Okayama 700, Japan
Yoshinari Miura
Affiliation:
Department of Applied Chemistry, Okayama University, Tsushima-naka, Okayama 700, Japan
Yoshihiro Daitoh
Affiliation:
Institute for Chemical Research, Kyoto University, Uji, Kyoto-fu 611, Japan
Mikio Takano
Affiliation:
Institute for Chemical Research, Kyoto University, Uji, Kyoto-fu 611, Japan
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Abstract

Titanium di- and sesquioxide films were epitaxially grown on the (001) surface of sapphire single-crystalline substrates by an activated reactive evaporation method. Formation range for each titanium oxide was determined as a function of oxygen pressure (Po2) by means of x-ray diffraction, transmission electron microscopy, and Raman spectroscopy. Films prepared at Po2 ≥ 2.0 × 10−4 Torr were stoichiometric (100)-oriented rutile of TiO2, and with decreasing Po2 they would accommodate more and more Ti3+ ions in the rutile structure. At Po2 = 0.6 × 10−4 Torr, on the other hand, (001)-oriented Ti2O3 was formed and an electrical transition was clearly detected at about 400 K. However, the large lattice mismatch between the substrate and these films leads to a periodic introduction of misfit dislocations in the case of the TiO2 films and a mixing of stacking sequences for the Ti2O3 films.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 6 , June 1994 , pp. 1468 - 1473
Copyright
Copyright © Materials Research Society 1994

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References

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