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Indium hydroxide to bixbyite-type indium oxide transition probedin situby time resolved synchrotron radiation

Schlicker, L. and Riedel, R. and Gurlo, A. (2009):
Indium hydroxide to bixbyite-type indium oxide transition probedin situby time resolved synchrotron radiation.
In: Nanotechnology, 20 (49), IOP Publishing, p. 495702, ISSN 0957-4484,
[Online-Edition: http://dx.doi.org/10.1088/0957-4484/20/49/495702],
[Article]

Abstract

The understanding of the transformation mechanism involved in the dehydroxylation reactions in the In–O–H system exhibits large controversy and discrepancy; it holds especially for the formation of the metastable nanosized intermediates as well as for the structural relation between corresponding phases. It was recently reported that indium oxohydroxide (InOOH) appears as an intermediate phase in the thermal dehydroxylation of nanoscaled In(OH)3. Our in situ time resolved high energy synchrotron radiation experiments showed unambiguously that no intermediate crystalline or amorphous phases have been observed during the phase transition (dehydroxylation) from nanosized indium hydroxide to indium oxide. Under our experimental conditions, the c-In(OH)3 to bixbyite-type In2O3 transition was observed between 280 and 305 ◦C and the conversion completed around 305 ◦C without any observable intermediates. The formation of InOOH during the phase transition In(OH)3 → bixbyite-type In2O3 can be ruled out. This finding is of high relevance and importance for the controllable synthesis of nanocrystalline In2O3-based materials.

Item Type: Article
Erschienen: 2009
Creators: Schlicker, L. and Riedel, R. and Gurlo, A.
Title: Indium hydroxide to bixbyite-type indium oxide transition probedin situby time resolved synchrotron radiation
Language: English
Abstract:

The understanding of the transformation mechanism involved in the dehydroxylation reactions in the In–O–H system exhibits large controversy and discrepancy; it holds especially for the formation of the metastable nanosized intermediates as well as for the structural relation between corresponding phases. It was recently reported that indium oxohydroxide (InOOH) appears as an intermediate phase in the thermal dehydroxylation of nanoscaled In(OH)3. Our in situ time resolved high energy synchrotron radiation experiments showed unambiguously that no intermediate crystalline or amorphous phases have been observed during the phase transition (dehydroxylation) from nanosized indium hydroxide to indium oxide. Under our experimental conditions, the c-In(OH)3 to bixbyite-type In2O3 transition was observed between 280 and 305 ◦C and the conversion completed around 305 ◦C without any observable intermediates. The formation of InOOH during the phase transition In(OH)3 → bixbyite-type In2O3 can be ruled out. This finding is of high relevance and importance for the controllable synthesis of nanocrystalline In2O3-based materials.

Journal or Publication Title: Nanotechnology
Volume: 20
Number: 49
Publisher: IOP Publishing
Uncontrolled Keywords: Nanoscale science and low-D systems, Condensed matter: structural, mechanical & thermal, Chemical physics and physical chemistry
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
Date Deposited: 13 Apr 2012 09:30
Official URL: http://dx.doi.org/10.1088/0957-4484/20/49/495702
Identification Number: doi:10.1088/0957-4484/20/49/495702
Funders: We thank the Fonds der Chemischen Industrie (Frankfurt, Germany) ., DFG Priority Program 1236 ‘Oxides, carbides and nitrides at extremely high pressures and temperatures’, DFG Priority Program 1299 ‘Adapting surfaces for high temperature applications’, We thank the ESRF (Grenoble, France, experiment MA-695) for the financial support.
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