Dynamics across the liquid-liquid transition in supercooled tellurium
Liquid-liquid transitions are found in many simple metals and semi-conductors, in the chalcogenides (S,Se,Te) and in network glasses and elemental liquids. How the thermodynamic signatures of these liquid-liquid transitions are related to the underlying structural and dynamical liquid properties is not well known. Tellurium, as several other chalcogenides, shows a clear thermodynamic transition with a peak in compressibility and heat capacity and a maximum in its density. This behaviour is related to a change in liquid structure and for tellurium the transition takes place in the supercooled regime at ~353 deg C. We want to know how the thermodynamic transition is manifested in the microscopic liquid dynamics. We thus propose to measure the dynamic structure factor across the liquid-liquid transition in Te using the neutron spin echo technique to reach the relevant time and length-scales. We have previously been granted beam time at IN11 for a test experiment (6-01-307) to prove the feasibility of using NSE at IN11 to study the dynamics in supercooled Te. We here propose the full experiment drawing on the experience of the test run.
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MATTSSON Johan; FALUS Peter and MATIC Aleksandar. (2012). Dynamics across the liquid-liquid transition in supercooled tellurium. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.6-01-314
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