title: A new polymorph of FeAlO3 at high pressure.
abstract: Synchrotron X-ray diffraction measurements confirmed that a new polymorph of FeAlO3 could be synthesized at about 1800 K and 72 GPa. This phase can be indexed on an orthorhombic cell and transforms into the trigonal form on release of pressure. The c/a ratio of about 2.71 of the trigonal phase suggests corundum structure of FeAlO3 rather than LiNbO3 or ilmenite structure. This conclusion also suggests that the high-pressure orthorhombic phase could be the Rh2O3(II) structure rather than the GdFeO3-type perovskite structure.
authors.affiliation: Division of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan. nagai@ep.sci.hokudai.ac.jp
authors.forename: Takaya
authors.initials: T
authors.lastname: Nagai
authors.forename: Daisuke
authors.initials: D
authors.lastname: Hamane
authors.forename: P Sujatha
authors.initials: PS
authors.lastname: Devi
authors.forename: Nobuyoshi
authors.initials: N
authors.lastname: Miyajima
authors.forename: Takehiko
authors.initials: T
authors.lastname: Yagi
authors.forename: Takamitsu
authors.initials: T
authors.lastname: Yamanaka
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Fujino