Abstract
The ambient pressure fcc phase of transforms into a tetragonal near and then into an orthorhombic phase above . While the structures of the cubic and tetragonal phases are known, the structural information for the orthorhombic phase was limited to the space group and cell parameters. Here, we present synchrotron powder diffraction data for collected in a diamond anvil cell up to . A -type structure of the orthorhombic high-pressure phase was solved ab initio from diffraction data and refined by the Rietveld method. Both tetragonal and orthorhombic phases show pronounced preferred orientation of crystallites with respect to the compression direction.
- Received 30 May 2007
DOI:https://doi.org/10.1103/PhysRevB.76.092104
©2007 American Physical Society