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

• Verfasst von: Ovsyannikov, Sergey [VerfasserIn]
• Verfasst von: Wu, Xiang [VerfasserIn]
• Verfasst von: Shchennikov, Vladimir V. [VerfasserIn]
• Verfasst von: Karkin, Alexander E. [VerfasserIn]
• Verfasst von: Dubrovinskaia, Natalia [VerfasserIn]
• Verfasst von: Garbarino, Gaston [VerfasserIn]
• Verfasst von: Dubrovinsky, Leonid [VerfasserIn]
• Titel: Structural stability of a golden semiconducting orthorhombic polymorph of Ti2O3 under high pressures and high temperatures
• Verf.angabe: Sergey V. Ovsyannikov, Xiang Wu, Vladimir V. Shchennikov, Alexander E. Karkin, Natalia Dubrovinskaia, Gaston Garbarino amd Leonid Dubrovinsky
• E-Jahr: 2010
• Jahr: 31 August 2010
• Umfang: 10 S.
• Fussnoten: Im Text sind "2" und "3" tiefgestellt ; Gesehen am 21.06.2023
• Titel Quelle: Enthalten in: Journal of physics / Condensed matter
• Ort Quelle: Bristol : IOP Publ., 1989
• Jahr Quelle: 2010
• Band/Heft Quelle: 22(2010), 37, Artikel-ID 375402, Seite 1-10
• ISSN Quelle: 1361-648X
• DOI: doi:10.1088/0953-8984/22/37/375402
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 185071357X

Abstract

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.