Phase Diagram of Iron Determined by High-Pressure/Temperature X-Ray Diffraction Using Synchrotron Radiation
- Murli H. Manghnani and
- Yasuhiko Syono
Published Online: 21 MAR 2013
Copyright © 1987 by Terra Scientific Publishing Company (TERRAPUB), Tokyo.
High-Pressure Research in Mineral Physics: A Volume in Honor of Syun-iti Akimoto
How to Cite
Akimoto, S.-I., Suzuki, T., Yagi, T. and Shimomura, O. (2013) Phase Diagram of Iron Determined by High-Pressure/Temperature X-Ray Diffraction Using Synchrotron Radiation, in High-Pressure Research in Mineral Physics: A Volume in Honor of Syun-iti Akimoto (eds M. H. Manghnani and Y. Syono), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM039p0149
- Published Online: 21 MAR 2013
- Published Print: 1 JAN 1987
Print ISBN: 9780875900667
Online ISBN: 9781118664124
- Mineralogy and Crystal Chemistry;
- Phase transformations;
- High Pressure-High Temperature Research
The phase diagram of iron was investigated in the pressure-temperature region up to 12.5 GPa and 800°C using a cubic-anvil type of high-pressure apparatus combined with synchrotron radiation. In situ measurements with an energy-dispersive X-ray diffraction system enabled us to carry out dynamical observations of the phase transformation. It was found that iron transformed rather rapidly when the temperature was raised to the stability field of the γ-phase. Preliminary α-γ and ε-γ phase boundaries were determined. The α/γ/ε triple point, which was tentatively defined as a minimum temperature of the phase boundary, was located at 8.3 GPa and 440°C. It was difficult to precisely determine the equilibrium phase boundary between the α- and ε-phases, but the present experiments suggest a positive dP/dT for this α-ε phase boundary.