Pbca-Type In2O3: The High-Pressure Post-Corundum phase at Room Temperature.

详细信息    查看全文

• 作者：B. Garc铆a-Domene ; J. A. Sans ; O. Gomis ; F. J. Manj贸n ; H. M. Ortiz ; D. Errandonea ; D. Santamar铆a-P茅rez ; D. Mart铆nez-Garc铆a ; R. Vilaplana ; A. L. J. Pereira ; A. Morales-Garc铆a ; P. Rodr铆guez-Hern谩ndez ; A. Mu帽oz ; C. Popescu ; A. Segura
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：September 4, 2014
• 年：2014
• 卷：118
• 期：35
• 页码：20545-20552
• 全文大小：460K
• ISSN：1932-7455

文摘

High-pressure powder X-ray diffraction and Raman scattering measurements in cubic bixbyite-type indium oxide (c-In₂O₃) have been performed at room temperature. On increasing pressure c-In₂O₃ undergoes a transition to the Rh₂O₃鈥揑I structure but on decreasing pressure Rh₂O₃鈥揑I-type In₂O₃ undergoes a transition to a previously unknown phase with Pbca space group which is isostructural to Rh₂O₃鈥揑II. On further decrease of pressure, we observed a phase transition to the metastable corundum-type In₂O₃ near room conditions. Recompression of the metastable corundum-type In₂O₃ at room temperature leads to a transition to the Rh₂O₃鈥揑II phase, thus showing that the Rh₂O₃鈥揑II phase is the post-corundum phase at room temperature. Our results are supported by theoretical ab initio calculations. Furthermore, they show that the Rh₂O₃鈥揑II phase could be present in other sesquioxides, thus prompting to a revision of the pressure鈥搕emperature phase diagrams of sesquioxides