Abstract
The temperature-induced frequency shifts (1/ω)(∂ω/∂T) p are calculated from the pressure induced frequency shifts (1/ω)(∂ω/∂P) T using the observed frequencies at various pressures for the Raman modes of II and III in phase II (P > P C ) of s-triazine. The values of the mode Gruneisen parameters γ T (isobaric) and γ T (isothermal) of those Raman modes studied here, are determined through the Pippard relations in the spectroscopically modified forms for this crystal. The temperature-induced and the pressure-induced frequency shifts are then used to predict the pressure dependence of the isothermal compressibility, thermal expansion and the specific heat in phase II (P > P C ) of s-triazine.
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