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

Title data

Ovsyannikov, Sergey V. ; Wu, Xiang ; Shchennikov, Vladimir V. ; Karkin, Alexander E. ; Dubrovinskaia, Natalia ; Garbarino, Gaston ; Dubrovinsky, Leonid:
Structural stability of a golden semiconducting orthorhombic polymorph of Ti2O3 under high pressures and high temperatures.
In: Journal of Physics: Condensed Matter. Vol. 22 (2010) Issue 37 . - No. 375402.
ISSN 1361-648X
DOI: https://doi.org/10.1088/0953-8984/22/37/375402

Official URL:

Abstract in another language

An orthorhombic polymorph of titanium oxide (Ti 2 O 3 ) has been synthesized at high pressure–high temperature (HP–HT) conditions. It has been refined in the Pnma space group and the Th 2 S 3 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) Å 3 and Z = 4. The samples of Pnma -Ti 2 O 3 were of a golden colour, in contrast to the conventional black corundum-structured Ti 2 O 3 . 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 Th 2 S 3 -structured Ti 2 O 3 samples showed a semiconducting behaviour and, at ambient conditions, was equal to0.20–0.46 Ω cm. Conventional near-infrared absorption spectroscopy established the absence of energy gaps above 0.25 eV.

Further data

Item Type:	Article in a journal
Refereed:	Yes
Institutions of the University:	Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Chair Crystallography Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Professor Materials Physics and Technology at Extreme Conditions > Professor Materials Physics and Technology at Extreme Conditions - Univ.-Prof. Dr. Natalia Doubrovinckaia Faculties Faculties > Faculty of Mathematics, Physics und Computer Science Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Professor Materials Physics and Technology at Extreme Conditions
Result of work at the UBT:	Yes
DDC Subjects:	500 Science > 530 Physics
Date Deposited:	31 Jul 2015 06:40
Last Modified:	12 Jul 2022 12:05
URI:	https://eref.uni-bayreuth.de/id/eprint/17457