Abstract
Inelastic neutron spectroscopy has been performed on two members of the family of superionic glasses: xLi2SO4·(1−x)LiPO3, x = 0.05 and 0.3. Measurements were performed on the thermal triple-axis spectrometer (Triax) at the University of Missouri Research Reactor covering 0.7Å−1<Q<4.5Å−1 and −2meV<E<25meV. A clear signature of a Boson peak is present for both the x = 0.05 and x = 0.3 samples. The Boson peak associated with the x = 0.3 sample is found to be enhanced and broadened to the high energy side of the peak compared to that of the x = 0.05 sample, indicating that the presence of more Li-salt results in modified dynamics of the underlying structural framework. Such dynamics are expected to influence the ionic conduction properties of these materials that are important as possible electrolyte materials in all solid-state Li-ion batteries.
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