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In-situ high pressure high temperature experiments in multi-anvil assemblies with bixbyite-type In2O3 and synthesis of corundum-type and orthorhombic In2O3polymorphs

Bekheet, Maged F. and Schwarz, Marcus R. and Lauterbach, Stefan and Kleebe, Hans-Joachim and Kroll, Peter and Stewart, Andrew and Kolb, Ute and Riedel, Ralf and Gurlo, Aleksander (2013):
In-situ high pressure high temperature experiments in multi-anvil assemblies with bixbyite-type In2O3 and synthesis of corundum-type and orthorhombic In2O3polymorphs.
In: High Pressure Research, 33 (3), Taylor & Francis, pp. 697-711, ISSN 0895-7959,
[Online-Edition: http://dx.doi.org/10.1080/08957959.2013.834896],
[Article]

Abstract

Our in situ high pressure high temperature experiments in multi-anvil assemblies unambiguously evidence the stability of bixbyite-type c-In2O3 at 6 GPa from room temperature to ca. 600°C. At 5.5 GPa and ca. 1100°C, c-In2O3 reacts with free carbon from the amorphous Si‒B‒C‒N capsule being reduced to metallic indium. The material recovered from the ex situ multi-anvil experiment at 6 GPa and 1100°C using the Mo capsule is inhomogeneous, thereby its phase composition depends on the specimen position from the furnace midline that in turn is characterized by the inhomogeneous temperatures. In the midpoint of the furnace, at the highest temperature point, c-In2O3 completely transforms into a corundum-type rh-In2O3 polymorph that is recovered under ambient conditions, as confirmed by X-ray powder and electron diffraction and Raman spectroscopy. Transmission electron microscopic characterization indicates the growth of single crystals of corundum-type rh-In2O3 with an average crystal size of 3 μm in the specimen part away from the furnace midline. The automated electron diffraction tomography analysis and X-ray powder-diffraction point out at the possible formation of orthorhombic In2O3 polymorphs.

Item Type: Article
Erschienen: 2013
Creators: Bekheet, Maged F. and Schwarz, Marcus R. and Lauterbach, Stefan and Kleebe, Hans-Joachim and Kroll, Peter and Stewart, Andrew and Kolb, Ute and Riedel, Ralf and Gurlo, Aleksander
Title: In-situ high pressure high temperature experiments in multi-anvil assemblies with bixbyite-type In2O3 and synthesis of corundum-type and orthorhombic In2O3polymorphs
Language: English
Abstract:

Our in situ high pressure high temperature experiments in multi-anvil assemblies unambiguously evidence the stability of bixbyite-type c-In2O3 at 6 GPa from room temperature to ca. 600°C. At 5.5 GPa and ca. 1100°C, c-In2O3 reacts with free carbon from the amorphous Si‒B‒C‒N capsule being reduced to metallic indium. The material recovered from the ex situ multi-anvil experiment at 6 GPa and 1100°C using the Mo capsule is inhomogeneous, thereby its phase composition depends on the specimen position from the furnace midline that in turn is characterized by the inhomogeneous temperatures. In the midpoint of the furnace, at the highest temperature point, c-In2O3 completely transforms into a corundum-type rh-In2O3 polymorph that is recovered under ambient conditions, as confirmed by X-ray powder and electron diffraction and Raman spectroscopy. Transmission electron microscopic characterization indicates the growth of single crystals of corundum-type rh-In2O3 with an average crystal size of 3 μm in the specimen part away from the furnace midline. The automated electron diffraction tomography analysis and X-ray powder-diffraction point out at the possible formation of orthorhombic In2O3 polymorphs.

Journal or Publication Title: High Pressure Research
Volume: 33
Number: 3
Publisher: Taylor & Francis
Uncontrolled Keywords: indium oxide, multi-anvil apparatus, phase transition, X-ray diffraction, electron diffraction
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences > Earth Science > Geo-Material-Science
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
Date Deposited: 19 Feb 2014 13:27
Official URL: http://dx.doi.org/10.1080/08957959.2013.834896
Additional Information:

Special Issue: Single-crystal X-ray diffraction in the megabar pressure range

Identification Number: doi:10.1080/08957959.2013.834896
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