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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Gurlo, Aleksander Kroll, Peter Riedel, Ralf |
| Description | Author Affiliation: Gurlo A ( Fachbereich Material- und Geowissenschaften, Technische Universitaet Darmstadt, Petersenstrasse 23, Darmstadt, Germany. gurlo@materials.tu-darmstadt.de) |
| Abstract | The description of structural relations between bixbyite- and corundum-type structures is of particular interest because of the common occurrence of both structures. One of the representative examples of the bixbyite to corundum transition is the high-pressure high-temperature synthesis of the corundum-type indium oxide. The wet chemistry synthesis and stabilisation of the corundum-type $In_{2}O_{3}$ under ambient pressure conditions calls for a re-interpretation of the InO phase diagram as well as for the clarification of the phase transitions in $In_{2}O_{3}.$ One of the questions to be clarified is the stability of the corundum-type $In_{2}O_{3}.$ In the present work we studied the stability of the corundum-type $In_{2}O_{3}$ both theoretically (by density-functional calculations) and experimentally. The synthesis of the corundum-type $In_{2}O_{3}$ was performed by the modified non-alkoxide sol–gel method based on the ammonia-induced hydrolysis of indium nitrate in methanol. The corundum-type $In_{2}O_{3}$ was subjected to thermal analysis (STA) as well as to structural studies, that is, it was examined using X-ray powder diffraction (XRPD) including in situ XRPD characterisation upon thermal treatment. For the first time we have undoubtedly demonstrated, both theoretically and experimentally, the metastability of the corundum-type $In_{2}O_{3}$ polymorph. The $In_{2}O_{3}$ polymorph appears to be metastable throughout the entire enthalpy–pressure phase diagram. Upon heating, corundum-type $In_{2}O_{3}$ transforms irreversibly into cubic bixbyite-type $In_{2}O_{3}$ as shown by STA as well as in situ heating XRPD experiments. Computations indicate the existence of another high-pressure modification of $In_{2}O_{3}$ with orthorhombic structure, iso-typic to $Rh_{2}O_{3}-II.$ We predict this new phase to form at pressures exceeding 15 GPa from both the cubic bixbyite-type and the corundum-type modification of $In_{2}O_{3}.$ |
| ISSN | 09476539 |
| e-ISSN | 15213765 |
| Journal | Chemistry - A European Journal |
| Issue Number | 11 |
| Volume Number | 14 |
| Language | English |
| Publisher | Wiley-VCH;ChemPubSoc Europe |
| Publisher Date | 2008-01-01 |
| Publisher Place | Germany |
| Access Restriction | Open |
| Subject Keyword | Chemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Organic Chemistry Catalysis |
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