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APS » Journals » Phys. Rev. Lett. » Volume 86 » Issue 21
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Phys. Rev. Lett. 86, 4851–4854 (2001)

Pressure-Induced Invar Effect in Fe-Ni Alloys

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Leonid Dubrovinsky1, Natalia Dubrovinskaia1, Igor A. Abrikosov2, Marie Vennström3, Frank Westman1, Stefan Carlson4, Mark van Schilfgaarde5, and Börje Johansson2,6
1Department of Earth Sciences, Uppsala University, S-752 36 Uppsala, Sweden
2Condensed Matter Theory Group, Department of Physics, Uppsala University, S-751 21, Uppsala, Sweden
3Department of Inorganic Chemistry, Uppsala University, S-751 21 Uppsala, Sweden
4European Synchrotron Radiation Facility, Grenoble 38043, France
5Sandia National Laboratories, Livermore, California 94551
6Applied Materials Physics, Department of Materials Science and Engineering, Royal Institute of Technology, Brinellvägen 23, SE-100 44 Stockholm, Sweden

Received 18 January 2001; published in the issue dated 21 May 2001

We have measured the pressure-volume (P-V) relations for cubic iron-nickel alloys for three different compositions: Fe0.64Ni0.36, Fe0.55Ni0.45, and Fe0.20Ni0.80. It is observed that for a certain pressure range the bulk modulus does not change or can even decrease to some minimum value, after which it begins to increase under still higher pressure. In our experiment, we observe for the first time a new effect, namely, that the Fe-Ni alloys with high Ni concentrations, which show positive thermal expansion at ambient pressure, become Invar system upon compression over a certain pressure range.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.4851
DOI:
10.1103/PhysRevLett.86.4851
PACS:
64.30.+t, 64.70.Kb, 91.35.-x
 
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