Internally-Heated Diamond-Anvil Cell: Phase Diagram and P-V-T of Iron

  1. Murli H. Manghnani and
  2. Yasuhiko Syono
  1. R. Boehler,
  2. M. Nicol and
  3. M. L. Johnson

Published Online: 21 MAR 2013

DOI: 10.1029/GM039p0173

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

Boehler, R., Nicol, M. and Johnson, M. L. (1987) Internally-Heated Diamond-Anvil Cell: Phase Diagram and P-V-T of Iron, 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/GM039p0173

Author Information

  1. Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90024, USA

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

In situ pressure, temperature, and resistance measurements of resistively heated iron wires in gasketed diamond-anvil cells are used to locate solid-solid and solid-liquid phase transitions with high accuracy. Pressures are determined by using the ruby pressure scale and temperatures are measured by fitting a blackbody function to the spectrum of the hot wire taken with an optical multichannel analyzer. In this manner the α-γ transition line has been measured to 29 GPa. With a synchrotron X-ray source and resistively heated wires the powder diffraction patterns of α-, γ-, and ε-Fe have been obtained at pressures between 7 and 16 GPa and temperatures as high as 1000 K. The average volume thermal expansivity of α-Fe between 300 and 815 K at 9.5 GPa has been found to be 14±4×10−6 K−1 or about one-third of the value at atmospheric pressure. Preliminary data for γ-Fe indicate that the molar volume decreases by 6% along the α-γ transition line between atmospheric pressure and 9.5 GPa.