Nanocubes or Nanorhombohedra? Unusual Crystal Shapes of Corundum-Type Indium Oxide

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• 作者：Aleksander Gurlo ; Stefan Lauterbach ; Gerhard Miehe ; Hans-Joachim Kleebe ; Ralf Riedel
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：June 26, 2008
• 年：2008
• 卷：112
• 期：25
• 页码：9209 - 9213
• 全文大小：1235K
• 年卷期：v.112,no.25(June 26, 2008)
• ISSN：1932-7455

文摘

Sol−gel processing via the modified nonalkoxide route resulted in the formation of nanocrystals of the corundum-type In₂O₃ polymorph, which revealed characteristic rhombohedra with a morphology very close to cubes. Because the cubic bixbyite-type In₂O₃ polymorph is more abundant under ambient conditions, the seemingly cube-shaped morphology might confuse the experimentalist. As shown by transmission electron microscopy, this morphology does not reflect any relation to a cubic structure but appears accidentally with form {012} at a specific axis ratio of corundum-type structures. The pseudocubic particles have also been reported for α-Fe₂O₃, also in this case the pseudocubic nanorhombohedra are terminated by {012} facets.