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The technique of high resolution Brillouin spectroscopy has been used to determine the adiabatic elastic constants of oriented single crystals of (solid I) NH3 at temperatures near the triple point. The values obtained at 194.2 K were C11=81.1, C12=43.7, and C44=48.2 (in units of kbars) with an estimated absolute uncertainty of ±2%. No evidence for acoustic attenuation near the melting curve was found.
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Kiefte et al. (1985) studied this question.
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