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- W1983899668 abstract "Titanium oxide thin films were prepared by pulsed-laser deposition on LaAlO3 single crystal substrate at 700 °C. Pure anatase films are obtained at high oxygen pressure (10−1 mbar), while the rutile phase is evidenced at low oxygen pressure (10−5 mbar) despite a large oxygen deficiency (O/Ti=1.75). From asymmetric x-ray diffraction measurements, the in-plane epitaxial relationships be0tween the substrate and the titanium oxide phases are highlighted. Optical constants (refractive index n and extinction coefficient k) were deduced from ellipsometric measurements. The optical band gap energies of the anatase and rutile films are found to be 3.4 and 3.3 eV, respectively. Since the nearly stoichiometric anatase films are resistive (>103 Ω cm), the large oxygen deficiency in rutile films leads to noticeable increase in the conductivity due to the Ti3+ species, which supply electrons in the conduction band. At low temperature (T<200 K) the resistivity of rutile films versus temperature may be explained by a variable range hopping mechanism based on both two or three dimensional electron transfer between the Ti3+ and Ti4+ species." @default.
- W1983899668 created "2016-06-24" @default.
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- W1983899668 date "2008-08-01" @default.
- W1983899668 modified "2023-10-18" @default.
- W1983899668 title "Structural, optical, and electrical properties of epitaxial titanium oxide thin films on LaAlO3 substrate" @default.
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- W1983899668 doi "https://doi.org/10.1063/1.2964114" @default.
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