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Results of neutron (SANS study) and x-ray diffraction experiments with nanocluster samples of deuteroethanol (C2D5OD) or ordinary pure ethanol (C2H5OH) are presented. A deuterated ethanol sample, formed via quick cooling of ethanol–helium mixture down to 1.6 K, had clusters with the size of d ∼ 20–30 nm at liquid helium temperatures. After warming up to liquid nitrogen temperatures the gel decays into an amorphous white powder. It was observed that these powder samples remained in the amorphous state even after keeping at T ≤ 90 K for a long time (a few months). The neutron studies were supported by further x-ray investigations of the structure and the phase transitions in the highly dispersed powder samples, which were created via the decay of the gel samples of ordinary ethanol at temperatures above liquid nitrogen up to 150 K at saturated nitrogen gas pressure. Annealing of the “gel” sample during half an hour at a temperature of T ∼ 110 K resulted in a phase transition to a monoclinic phase with the c...

Structural and phase transitions in nanocluster ethanol samples at low temperatures