Dynamical aspects of alloys with negative thermal expansion.
Study of the temperature evolution of the dynamical properties S(q,omega) of the Selenium-Tellurium alloy (Se.5Te.5) that shows a negative thermal expansion (NTE) and a liquid-liquid continuous transition between 568 C and 858 C. We will focus on the vibrational density of states, particularly the evolution of the its high energy stretching modes around 25 meV, which are sensitive to the Peierls distortion amplitude. The latter is reduced with temperature and is accompanied by a softening of the vibrational (stretching) modes with an increase of the vibrational entropy. This proposal is a continuation of a series of successful measurements made on SexTe(1-x) alloys in the Te rich side.
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GASPARD Jean Pierre; COULET Marie Vanessa; HIPPERT Francoise; JOHNSON Mark Robert and RATY Jean Yves. (2013). Dynamical aspects of alloys with negative thermal expansion.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.6-03-428
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