High pressure refractive index measurements of 4:1 methanol:ethanol

Abstract

Spectroscopic refractive indices of monoclinic single crystal and ceramic lutetium oxyorthosilicate from 200 to 850nm J. Appl. Phys. 112, 063524 (2012) Full extraction methods to retrieve effective refractive index and parameters of a bianisotropic metamaterial based on material dispersion models J. Appl. Phys. 112, 064907 (2012) GaN-based light emitting diodes with micro-and nano-patterned structures by femtosecond laser nonlinear decomposition Appl. Phys. Lett. 101, 131103 (2012) On the method of photoluminescence spectral intensity ratio imaging of silicon bricks: Advances and limitations J. Appl. Phys. 112, 063116 (2012) Aluminium doped Zn1−xMgxO-A transparent conducting oxide with tunable optical and electrical properties A new technique for measuring the refractive index at high pressure in a diamond anvil cell is reported. This technique was applied to a 4:l methanohethanol mixture at room temperature and pressures up to 16.9 GPa. A parameterization is given for the refractive index that fits the data with a residual standard error of 4~ 10~~ at frequencies between 12 000 and 24 000 cm-l and pressures between 0.5 and 11.5 GPa. A sharp change in slope of the refractive index vs pressure was observed at the glass transition near 10 GPa. Modifications of the technique which should allow measurements of the refractive index to much higher pressures are discussed.

Competition between vitrification and crystallization of methanol at high pressure

“…3, 10.5Ϯ0.5 GPa, is in excellent agreement with the anticipated pressure of 11.0Ϯ0.7 GPa, obtained from an extrapolation of the viscosity to a value of 10 13 P. 21 It coincides also notably well with the glass transition pressure of 10.8 GPa for the mixture 4:1-M:E, 23 in which the ethanol suppresses crystallization.…”

“…22 It seems better established that crystallization of methanol can be suppressed by addition of ethanol: The well known hydrostatic pressure medium of a 4:1 mixture of methanol to ethanol ͑4:1-M:E͒ starts to develop pressure gradients near 10.4 GPa. 20 At 10.8 GPa, Eggert et al 23 have observed a change of the slope of the refractive index as a function of pressure, reminiscent of the temperature dependent behavior at the glass transition. 24 We study pressurized methanol by x-ray diffraction, Raman spectroscopy, optical ͑polarization͒ microscopy, and hydrostaticity measurements.…”

Pressure Effects on the Optical Properties of LuVO₄:Eu³⁺ Nanoparticles

“…For more detailed see references [6,17]. Pressure dependence of the energy transition W for 5 D 0  7 F 2 we obtained using equation (1) [30]. Also, some authors concluded that change of the nanoparticles refractive index arise due the modification of the polarizabilities of the surrounding medium [31].…”

Ultrafast high strain rate acoustic wave measurements at high static pressure in a diamond anvil cell

“…Using the equation of state estimated by Eggert et al 12 , a pressure difference in this range implies a strain of approximately 1% and a strain rate (for a rise that is < 10 ps) greater than 10 9 /s. This is an estimate of the strain at the acoustic front based on the reflectivity (R s ).…”

“…s nR n 2 = ∆ , here we assume R f~ 1). At 11 GPa, the static index of refraction vs. pressure given by Eggert et al 12 give the variation of index with pressure as 9.4 x 10 -3 /GPa. Assuming this variation of index with pressure, the phase amplitude of 8 mrad at 11…”