Phase Diagram of Iron Determined by High-Pressure/Temperature X-Ray Diffraction Using Synchrotron Radiation

  1. Murli H. Manghnani and
  2. Yasuhiko Syono
  1. Syun-Iti Akimoto1,
  2. Toshihiro Suzuki1,
  3. Takehiko Yagi2 and
  4. Osamu Shimomura3

Published Online: 21 MAR 2013

DOI: 10.1029/GM039p0149

High-Pressure Research in Mineral Physics: A Volume in Honor of Syun-iti Akimoto

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

Author Information

  1. 1

    Institute for Solid State Physics, University of Tokyo, Minato-Ku, Tokyo 106, Japan

  2. 2

    Research Institute for Iron, Steel and Other Metals, Tohoku University, Katahira, Sendai 980, Japan

  3. 3

    National Institute for Research in Inorganic Materials, Sakura-Mura, Niihari-Gun, Ibaraki 305, Japan

Publication History

  1. Published Online: 21 MAR 2013
  2. Published Print: 1 JAN 1987

ISBN Information

Print ISBN: 9780875900667

Online ISBN: 9781118664124

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Keywords:

  • Mineralogy and Crystal Chemistry;
  • Phase transformations;
  • High Pressure-High Temperature Research

Summary

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.