Pressure-Induced Invar Effect in Fe-Ni Alloys

Leonid Dubrovinsky; Natalia Dubrovinskaia; Igor A. Abrikosov; Marie Vennström; Frank Westman; Stefan Carlson; Mark van Schilfgaarde; Börje Johansson

doi:10.1103/PhysRevLett.86.4851

Pressure-Induced Invar Effect in Fe-Ni Alloys

Leonid Dubrovinsky, Natalia Dubrovinskaia, Igor A. Abrikosov, Marie Vennström, Frank Westman, Stefan Carlson, Mark van Schilfgaarde, and Börje Johansson

Phys. Rev. Lett. 86, 4851 – Published 21 May 2001

Abstract

We have measured the pressure-volume $(P - V)$ relations for cubic iron-nickel alloys for three different compositions: $Fe_{0.64} Ni_{0.36}$ , $Fe_{0.55} Ni_{0.45}$ , and $Fe_{0.20} Ni_{0.80}$ . 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.

Received 18 January 2001

DOI:https://doi.org/10.1103/PhysRevLett.86.4851

Authors & Affiliations

Leonid Dubrovinsky¹, Natalia Dubrovinskaia¹, Igor A. Abrikosov², Marie Vennström³, Frank Westman¹, Stefan Carlson⁴, Mark van Schilfgaarde⁵, and Börje Johansson^2,6

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