Dielectric response in methanol measured in wide pressure and temperature range (P<6.0 GPa; 100 K <T< 360 K) reveals a series of anomalies which can be interpreted as a transformation between several solid phases of methanol including a hitherto unknown high-pressure low-temperature phase with stability range P> 1.2 GPa T<270 K. In the intermediate P-T region P≈3.4−3.7 GPa T≈260−280 K a set of complicated structural transformations occurs involving four methanol crystalline structures. At higher pressures within a narrow range P≈4.3−4.5 GPa methanol can be obtained in the form of fragile glass (Tg≈200 K, mp≈80 at P=4.5 GPa) by relatively slow cooling.
@article{arxiv.1305.3171,
title = {Phase transformations in methanol at high pressure measured by dielectric spectroscopy technique},
author = {M. V. Kondrin and A. A. Pronin and Y. B. Lebed and V. V. Brazhkin},
journal= {arXiv preprint arXiv:1305.3171},
year = {2015}
}