Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1333498 | Journal of Solid State Chemistry | 2006 | 6 Pages |
Fluorite-type phases in the system Y–Ta–O–N have been studied using both first-principle electronic-structure calculations and molecular-dynamic simulations to validate the structural data and to explain unusual asymmetric reflection profiles observed in the experimental X-ray diffraction patterns. We provide evidence that the compounds may be macroscopically described as to represent cubic fluorite-type defect structures despite the fact that DFT calculations clearly show that all crystallographic unit cells appear as triclinically distorted. Additionally, we find that there is a minute (but hardly significant) tendency for anionic ordering at absolute zero temperature but none under reaction conditions.
Graphical abstractStructural result of a room-temperature molecular-dynamic simulation of a supercell of Y0.125Ta0.875O0.875N□0.125.Figure optionsDownload full-size imageDownload as PowerPoint slide