Nature of the High-Pressure Transition inHematite
Open Access
- 29 October 2002
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 89 (20) , 205504
- https://doi.org/10.1103/physrevlett.89.205504
Abstract
We present a new method to separate the crystallographic and electronic phase transitions in hematite using x-ray emission spectroscopy and x-ray diffraction. Our observations, based on the behavior of a metastable high-pressure phase in the stability domain of the low-pressure phase, show that the electronic transition is preempted by the crystallographic transition. The former occurs only afterwards in the high-pressure phase, possibly as a result of a Mott transition. The idea that the electronic transition drives the transition in hematite is therefore invalidated. Such methods should help elucidate the mechanics and the driving forces behind a number of first-order high-pressure phase transitions.Keywords
This publication has 14 references indexed in Scilit:
- High-pressure structural studies of hematitePhysical Review B, 2002
- Magnetism in FeO at Megabar Pressures from X-Ray Emission SpectroscopyPhysical Review Letters, 1999
- Breakdown of the Mott-Hubbard State in: A First-Order Insulator-Metal Transition with Collapse of Magnetism at 50 GPaPhysical Review Letters, 1999
- High-resolution manganese x-ray fluorescence spectroscopy. Oxidation-state and spin-state sensitivityJournal of the American Chemical Society, 1994
- A study of the crystal structure of Fe2O3in the pressure range up to 65 GPa using synchrotron radiationPhysica Scripta, 1991
- High-pressure electrical resistivity measurements of Fe2O3: Comparison of static-compression and shock-wave experiments to 61 GPaSolid State Communications, 1986
- 57Fe Mössbauer study under high pressure; ε-Fe and Fe2O3Hyperfine Interactions, 1986
- Mössbauer study on the high pressure phase of Fe2O3Solid State Communications, 1984
- X-ray Mnemission spectra of manganese oxides and manganatesPhysical Review B, 1976
- Electron correlations in narrow energy bands. II. The degenerate band caseProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1964