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The technique of high resolution Brillouin spectroscopy has been used to determine the adiabatic elastic constants and the elasto-optic coefficient ratios of oriented single crystals of SF6 at temperatures near the triple point. The values of the elastic constants at 221.0 K are C11 =34.1, C12=22.2, and C44=13.2 (in units of kbar) and the elasto-optic coefficient ratios are P12 /P11 =0.92 and P44 /P11 =0.09. The temperature dependences of the elastic constants were determined and were found to be linear down to 187.0 K with ΔC11 /ΔT having a particularly large value of −0.46 kbar K−1 .
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Kiefte et al. (1988) studied this question.
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