A new polymorph of FeAlO3 at high pressure.
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.
Nagai
Takaya
T
Division of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan. nagai@ep.sci.hokudai.ac.jp
Hamane
Daisuke
D
Devi
P Sujatha
PS
Miyajima
Nobuyoshi
N
Yagi
Takehiko
T
Yamanaka
Takamitsu
T
Fujino
Kiyoshi
K