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Electrostriction of Near-Critical SF6 in Microgravity



G A. Zimmerli, R A. Wilkinson, R A. Ferrell, Michael R. Moldover


We used interferometry to measure the electric-field-induced (I.e., electrostrictive) increase of the density of sulfur hexafluoride near its critical point. The results at the temperatures Tc + 5 mK, Tc + 10 mK, and Tc + 30 mK, with Tc = 319 K, agree with a calculation based on the Clausius-Mossotti relation and the restricted cubic model equation of state. These measurements were performed in microgravity so that the electrostrictive density changes (< 3.5 % in this work) would not be complicated by stratification of the fluid s density induced by the Earth s gravity.
Physical Review Letters
No. 26


critical phenomena, critical point, electrostriction, equation of state, sulfur hexafluoride


Zimmerli, G. , Wilkinson, R. , Ferrell, R. and Moldover, M. (1999), Electrostriction of Near-Critical SF<sub>6</sub> in Microgravity, Physical Review Letters (Accessed February 20, 2024)
Created May 31, 1999, Updated October 12, 2021