Abstract
High-pressure Brillouin measurements of a pressure-transmitting medium Daphne 7474 have been performed at pressures up to about 12 GPa. We have determined the acoustic phase velocity, refractive index, equation of state, and adiabatic bulk modulus for Daphne 7474 as a function of pressure, and have evaluated the performance of Daphne 7474 as a hydrostatic pressure-transmitting medium. The obtained elastic properties show that Daphne 7474 is an excellent pressure-transmitting medium for transport and optical experiments in comparison with the 4:1 methanol–ethanol mixture below the solidification pressure 3.7 GPa of Daphne 7474.
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