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4 páginas, 3 figuras.-- PACS numbers: 61.05.F-, 64.70.kt, 77.22.GmTransformation of deuterated ethanol from supercooled liquid into a plastic crystal or rotator phase is investigated by means of a particular experimental setup combining simultaneously dielectric spectroscopy with neutron diffraction techniques. We demonstrate that, previous to the growth of the bcc lattice of the plastic crystal phase, the formation of a precursor or intermediate phase through a liquid-liquid phase separation takes place. Once this precursor phase is formed, subsequent (plastic) crystalline nucleation and growth is expected to develop.This work has been funded by the Spanish CICYT\ud(MAT2009-07789 and MAT2008-03232). A. S. also acknowledges the Higher Council for Scientific Research (CSIC) for financial support.Peer reviewe

physical review letters

Detection of Early Stage Precursor during Formation of Plastic Crystal Ethanol from the Supercooled Liquid State: A Simultaneous Dielectric Spectroscopy with Neutron Diffraction Study