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A Systematic Investigation of the Stability Field of Spinel-type Gallium Oxonitrides

Hering, Stefanie A. and Zvoriste, Carmen E. and Riedel, Ralf and Kinski, Isabel and Huppertz, Hubert (2009):
A Systematic Investigation of the Stability Field of Spinel-type Gallium Oxonitrides.
In: ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES, 64 (10), VERLAG Z NATURFORSCH, pp. 1115-1126, ISSN 0932-0776,
[Article]

Abstract

Over the last years, the synthesis and characterization of new spinel-type gallium oxonitrides were in the focus of several working groups. Our systematic investigation of the formation of the gallium oxonitride spinel phases was done under different experimental conditions and with various educts already used in former studies. The experiments took place under high-pressure/high-temperature conditions in a multianvil apparatus, starting from the end members wurtzite-structured GaN and beta-Ga(2)O(3). Beside the variation of the molar ratio of the educts (w-GaN: beta-Ga(2)O(3) = 9 : 1 - 1 : 9), different pressures (1 - 11.5 GPa), temperatures (500 - 1350 degrees C), and heating protocols were studied to localize the formation area of the spinel-type gallium oxonitrides. From these results, initial conditions of 2.5 - 11.5 GPa at temperatures between 1000 - 1300 degrees C can be stated as leading to the formation of Cubic, spinel-type gallium oxonitride phases. The temperature stability of the gallium oxonitride spinel phase as well as new results of the transformation of beta-Ga(2)O(3) into alpha-Ga(2)O(3) are reported.

Item Type: Article
Erschienen: 2009
Creators: Hering, Stefanie A. and Zvoriste, Carmen E. and Riedel, Ralf and Kinski, Isabel and Huppertz, Hubert
Title: A Systematic Investigation of the Stability Field of Spinel-type Gallium Oxonitrides
Language: English
Abstract:

Over the last years, the synthesis and characterization of new spinel-type gallium oxonitrides were in the focus of several working groups. Our systematic investigation of the formation of the gallium oxonitride spinel phases was done under different experimental conditions and with various educts already used in former studies. The experiments took place under high-pressure/high-temperature conditions in a multianvil apparatus, starting from the end members wurtzite-structured GaN and beta-Ga(2)O(3). Beside the variation of the molar ratio of the educts (w-GaN: beta-Ga(2)O(3) = 9 : 1 - 1 : 9), different pressures (1 - 11.5 GPa), temperatures (500 - 1350 degrees C), and heating protocols were studied to localize the formation area of the spinel-type gallium oxonitrides. From these results, initial conditions of 2.5 - 11.5 GPa at temperatures between 1000 - 1300 degrees C can be stated as leading to the formation of Cubic, spinel-type gallium oxonitride phases. The temperature stability of the gallium oxonitride spinel phase as well as new results of the transformation of beta-Ga(2)O(3) into alpha-Ga(2)O(3) are reported.

Journal or Publication Title: ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES
Volume: 64
Number: 10
Publisher: VERLAG Z NATURFORSCH
Uncontrolled Keywords: High-pressure Synthesis, Gallium Oxonitride, Spinel Structure, Gallium Oxide
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 13 Apr 2012 11:03
Funders: This work was financially supported by the Deutsche Forschungsgemeinschaft HU 966/5-1 and KI 838/3-1., H. Huppertz and R. Riedel are indebted to the Fonds der Chemischen Industrie for financial support.
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