Thermal expansion of RuFe alloys and its relationship to the high pressure phase of Fe

Qadri, Syed B.; Keller, Teddy M.; Laskoski, Matt; Skelton, E. F.; Husz, A.; Mahadik, N. A.
April 2009
Applied Physics Letters;4/27/2009, Vol. 94 Issue 17, p171907
Academic Journal
Ru1-xFex alloys crystallize in a hexagonal-close-packed structure for x<0.70 with a space group of P63/mmc, the same phase as that of a high pressure phase of iron, [variant_greek_epsilon]-Fe. Thermal expansion coefficients of Ru1-xFex alloys of various compositions were determined over a temperature range of 300–530 K using high resolution x-ray diffraction measurements. The coefficients of linear thermal expansion for hexagonal phase along the c and a axes showed a linear dependence on the composition. These results when extrapolated showed direct relationship to the thermoelastic properties of [variant_greek_epsilon]-Fe. This study also demonstrates that high pressure and high temperature phases can be simulated and engineered to exist at ambient conditions with proper choice of alloying.


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