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Temperature Dependence of The Raman Frequency Shifts Related to The Specific Heat and Thermal Expansion Close To I-II Phase Transition in S-Triazine.

A linear variation of the specific heat C-p with the frequency shifts 1/omega(partial derivative omega/partial derivative T)(p) is established for the Raman modes I-V at various temperatures (P=0) close to I-II phase transition in s-triazine (T-c=198 K).