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Structural stability of a golden semiconducting orthorhombic polymorph of Ti2O3 under high pressures and high temperatures

An orthorhombic polymorph of titanium oxide (Ti2O3) has been synthesized at high pressure-high temperature (HP-HT) conditions. It has been refined in the Pnma space group and the Th2S3 structural type with the unit cell parameters as follows: a = 7.8248(6) Å, b = 2.8507(4) Å, c = 8.0967(3) Å, V =...

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Main Authors: Ovsyannikov, Sergey (Author) , Wu, Xiang (Author) , Shchennikov, Vladimir V. (Author) , Karkin, Alexander E. (Author) , Dubrovinskaia, Natalia (Author) , Garbarino, Gaston (Author) , Dubrovinsky, Leonid (Author)
Format: Article (Journal)
Language:English
Published: 31 August 2010
In: Journal of physics. Condensed matter
Year: 2010, Volume: 22, Issue: 37, Pages: 1-10
ISSN:1361-648X
DOI:10.1088/0953-8984/22/37/375402
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1088/0953-8984/22/37/375402
Verlag, lizenzpflichtig, Volltext: https://dx.doi.org/10.1088/0953-8984/22/37/375402
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Author Notes:Sergey V. Ovsyannikov, Xiang Wu, Vladimir V. Shchennikov, Alexander E. Karkin, Natalia Dubrovinskaia, Gaston Garbarino amd Leonid Dubrovinsky
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Summary:An orthorhombic polymorph of titanium oxide (Ti2O3) has been synthesized at high pressure-high temperature (HP-HT) conditions. It has been refined in the Pnma space group and the Th2S3 structural type with the unit cell parameters as follows: a = 7.8248(6) Å, b = 2.8507(4) Å, c = 8.0967(3) Å, V = 180.61(1) Å3 and Z = 4. The samples of Pnma-Ti2O3 were of a golden colour, in contrast to the conventional black corundum-structured Ti2O3. The structural stability of this polymorph has been examined by simultaneous Raman and x-ray diffraction studies under high pressure over 70 GPa and high temperature over 2200 K. No phase transformations or chemical reactions have been established. The electrical resistivity of Th2S3-structured Ti2O3 samples showed a semiconducting behaviour and, at ambient conditions, was equal to 0.20-0.46 Ω cm. Conventional near-infrared absorption spectroscopy established the absence of energy gaps above 0.25 eV.
Item Description:Im Text sind "2" und "3" tiefgestellt
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Physical Description:Online Resource
ISSN:1361-648X
DOI:10.1088/0953-8984/22/37/375402

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