Pressure dependence of Raman scattering in sulphur nitrides

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Abstract
The pressure and temperature dependence of Raman scattering in S4N4 in the 0–10 kbar range at 295 K and in the 10–295 K. range at 0 pressure, have been studied in detail. S4N4 behaves like a typical molecular crystal under pressure except that the pressure dependences of the external mode frequencies are non-linear. The translational mode at 102 cm−1 shows an appreciable positive pressure coefficient and the lowest frequency rotational mode shows a temperature dependent softening which may be related to the thermochromic transition at ∼270 K. Correlation of the observed data with the expected behaviour of (SN) x is made. However, we have been unable to observe Raman scattering in (SN) x under both ambient and high pressure conditions.

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