Abstract
Pressure and temperature dependences of the Brillouin spectra for KCN and NaCN are shown for pressures of 0 to 7 kbar and temperatures of 178 K to 295 K for KCN and of 285 K to 340 K for NaCN. Dispersion of c44 and c’ = (c11 + c12 + 2c44)/2 and strong pressure dependence of To, the temperature where c44 would vanish, has been found for NaCN, whereas there is no dispersion for c44 and c’ and no pressure dependence of To in KCN. On the other hand it is shown for both substances that multiphonon interactions, which increase approaching the phase transition, are the dominant anharmonic effect for the zone center acoustic phonons. A review of current theories for the order-disorder transition of the CN--ion system is given.
Supported by the National Science Foundation under Grant DMR 76-16793 and the Deutsche Forschungsgemeinschaft.
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© 1978 Plenum Press, New York
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Hochheimer, H.D., Love, W.F., Walker, C.T. (1978). Brillouin Scattering at High Pressures. In: Chu, C.W., Woollam, J.A. (eds) High-Pressure and Low-Temperature Physics. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-3351-7_20
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DOI: https://doi.org/10.1007/978-1-4684-3351-7_20
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