Synthesis and High-Pressure Study of Corundum-Type In2O3

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• 作者：B. García-Domene ; J. A. Sans ; F. J. Manjón ; Sergey V. Ovsyannikov ; L. S. Dubrovinsky ; D. Martinez-Garcia ; O. Gomis ; D. Errandonea ; H. Moutaabbid ; Y. Le Godec ; H. M. Ortiz ; A. Mu?oz ; P. Rodríguez-Hernández ; C. Popescu
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：December 31, 2015
• 年：2015
• 卷：119
• 期：52
• 页码：29076-29087
• 全文大小：682K
• ISSN：1932-7455

文摘

This work reports the high-pressure and high-temperature (HP-HT) synthesis of pure rhombohedral (corundum-type) phase of indium oxide (In₂O₃) from its most stable polymorph, cubic bixbyite-type In₂O₃, using a multianvil press. Structural and vibrational properties of corundum-type In₂O₃ (rh-In₂O₃) have been characterized by means of angle-dispersive powder X-ray diffraction and Raman scattering measurements at high pressures which have been compared to structural and lattice dynamics ab initio calculations. The equation of state and the pressure dependence of the Raman-active modes of the corundum-type phase are reported and compared to those of corundum (α-Al₂O₃). It can be concluded that rh-In₂O₃ is stable under compression up to 14 GPa and it gradually transforms to the orthorhombic Rh₂O₃–III structure with Pbca space group (N. 61) between 14 and 26 GPa. The bulk modulus, axial compressibilities, and the pressure range of stability of the corundum-type phase in group IIIA sesquioxides A₂O₃ (A = Al, Ga, and In) are discussed.