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100 1 _ |a Helm, Bianca
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245 _ _ |a Correlating Structural Disorder to $Li^+$ Ion Transport in $Li_{4–x}Ge_{1–x}Sb_xS_4$ (0 ≤ x ≤ 0.2)
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520 _ _ |a Strong compositional influences are known to affect the ionic transport within the thio-LISICON family, however, a deeper understanding of the resulting structure - transport correlations have up until now been lacking. Employing a combination of high-resolution neutron diffraction, impedance spectroscopy and nuclear magnetic resonance spectroscopy, together with bond valence site energy calculations and the maximum entropy method for determining the underlying Li+ scattering density distribution of a crystal structure, this work assesses the impact of the Li+ substructure and charge carrier density on the ionic transport within the Li4-xGe1-xSbxS4 substitution series. By incorporating Sb5+ into Li4GeS4, an anisometric expansion of the unit cell is observed. An additional Li+ position is found as soon as (SbS4)3− polyhedra are present, leading to a better local polyhedral connectivity and a higher disorder in the Li+ substructure. Here, we are able to relate structural disorder to an increase in configurational entropy, together with a two order-of-magnitude increase in ionic conductivity. This result reinforces the typically believed paradigm that structural disorder leads to improvements in ionic transport.
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700 1 _ |a Minafra, Nicolò
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700 1 _ |a Wankmiller, Björn
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700 1 _ |a Agne, Matthias T.
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700 1 _ |a Li, Cheng
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700 1 _ |a Senyshyn, Anatoliy
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700 1 _ |a Hansen, Michael Ryan
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700 1 _ |a Zeier, Wolfgang G.
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773 _ _ |a 10.1021/acs.chemmater.2c00608
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856 4 _ |u https://juser.fz-juelich.de/record/908088/files/acs.chemmater.2c00608.pdf
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856 4 _ |y Published on 2022-06-09. Available in OpenAccess from 2023-06-09.
|u https://juser.fz-juelich.de/record/908088/files/Helm_LiGeSbS_revised_manuscript%20PDF.pdf
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