학술논문
Pbca-type In2O3: the lost pressure-induced post-corundum phase
Document Type
Working Paper
Author
García-Domene, Braulio; Sans, Juan A.; Gomis, Óscar; Manjón, Francisco J.; Ortiz, Henry M.; Errandonea, Daniel; Santamaría-Pérez, David; Martínez-García, Domingo; Vilaplana, Rosario; Pereira, André L. J.; Morales-García, Ángel; Rodríguez-Hernández, Plácida; Muñoz, Alfonso; Popescu, Catalin; Segura, Alfredo
Source
Subject
Language
Abstract
Contradictory results of high-pressure studies in cubic bixbyite-type indium oxide (c-In2O3) at room temperature (RT) have motivated us to perform high-pressure powder x-ray diffraction and Raman scattering measurements in this material. On increasing pressure c-In2O3 undergoes a transition to the Rh2O3-II structure. On decreasing pressure Rh2O3-II-type In2O3 undergoes a transition to a previously unknown phase which is isostructural to Rh2O3-III. On further decrease of pressure, another phase transition to corundum-type In2O3, which is metastable at room conditions, is observed. Recompression of metastable corundum-type In2O3 shows that the Rh2O3-III phase is the post-corundum phase. Our results are supported by theoretical ab initio calculations which show that the Rh2O3-III phase could be present in other sesquioxides, thus leading to a revision of the pressure-temperature phase diagrams of sesquioxides.
Comment: 14 pages, 7 figures, 2 tables
Comment: 14 pages, 7 figures, 2 tables