Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9837590 | Physica B: Condensed Matter | 2005 | 6 Pages |
Abstract
We report on in situ observations of a new cubic iridium dioxide (IrO2) polymorph. Experiments were performed using a laser-heated diamond anvil cell, and high-pressure data were collected using the synchrotron X-ray diffraction method. The new high-pressure IrO2 phase has a pyrite-type structure with space group Pa-3 and cubic symmetry. The phase was stable at pressures up to 50 GPa. The pyrite-type IrO2 structure is the same as that exhibited by other AO2 compounds at high pressure, such as SiO2, GeO2, and SnO2. The new high-pressure phase was not preserved on decompression to ambient pressure. The Birch-Murnaghan equation of state for this new cubic phase was determined from the experimental unit cell parameters, with K0=306 (±7) GPa when the value of K0â² was set to K0â²=4. The compressibility of the cubic IrO2 phase was in agreement with the compressibilities of other AO2 compounds reported in the literature.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Shigeaki Ono, Takumi Kikegawa, Yasuo Ohishi,