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Study of Glass Transition in K2HPO4 Aqueous Solution by Brillouin and Raman Spectroscopy

K 2 HPO 4 saturated aqueous solution has been found to undergo a glassy state without any crystallization at T g ∼200 K. Below T g the specimen become solid-like glass which is transparent in visual light. High frequency Raman spectra (>300 cm -1 ) of glassy state have shown the same spectral feature as those of solution. This indicates that the molecular structure is almost same both in solution and in glassy state. On the other hand low frequency Raman spectra below 300 cm -1 have changed with decreasing temperature. Through a least square analysis by using a 3 damped harmonic oscillators model, the spectral change from solution into glassy state has been well explained. With decreasing temperature from 288 K to 200 K the Brillouin shift frequency increases continuously, which corresponds to the gradual hardening of the elastic property.