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