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

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–II structure but on decreasing pressure Rh2O3–II-type In2O3 undergoes a t...

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Published in:Journal of physical chemistry. C 2014-09, Vol.118 (35), p.20545-20552
Main Authors: García-Domene, B, Sans, J. A, Gomis, O, Manjón, F. J, Ortiz, H. M, Errandonea, D, Santamaría-Pérez, D, Martínez-García, D, Vilaplana, R, Pereira, A. L. J, Morales-García, A, Rodríguez-Hernández, P, Muñoz, A, Popescu, C, Segura, A
Format: Article
Language:English
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Summary: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–II structure but on decreasing pressure Rh2O3–II-type In2O3 undergoes a transition to a previously unknown phase with Pbca space group which is isostructural to Rh2O3–III. 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–III phase, thus showing that the Rh2O3–III phase is the post-corundum phase at room temperature. Our results are supported by theoretical ab initio calculations. Furthermore, they show that the Rh2O3–III phase could be present in other sesquioxides, thus prompting to a revision of the pressure–temperature phase diagrams of sesquioxides
ISSN:1932-7447
1932-7455
DOI:10.1021/jp5061599