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- W2070003977 abstract "Recent ionic conductivity and tracer diffusion measurements over a large range of the mobile ion content x, carried out for Ag+- and Cu+-conducting chalcogenide and chalcohalide glasses, show two distinctly different ion transport regimes above the percolation threshold at ≈30 ppm M+: (i) a critical percolation regime at low x, and (ii) modifier-controlled ion transport at high x. Using a number of structural and spectroscopic techniques (high-resolution neutron diffraction, small-angle neutron scattering, high-energy X-ray diffraction, EXAFS, 129I-Mössbauer spectroscopy), we will show that the two regimes have a clear structural basis. Transport properties in the critical percolation domain depend almost exclusively on the connectivity of the host matrix represented by the average coordination number 〈n0〉: the nature of the mobile cations and chemical form of the dopant or of the host network do not play any important role. In contrast, the connectivity of the cation-related structural units MYz (Y=chalcogen or halide, z=3 or 4), evidenced by the short M–M correlations (from 2.7 to 4.2 Å) and reflected by the M–M coordination number, appears to be predominant in the modifier-controlled region. Highly connected edge- or corner-sharing (ES or CS) MYz units, which form at least 2D sheets or tunnels in the glass network, lead to the highest mobility of the M+ ions." @default.
- W2070003977 created "2016-06-24" @default.
- W2070003977 creator A5033936609 @default.
- W2070003977 date "2002-12-02" @default.
- W2070003977 modified "2023-09-30" @default.
- W2070003977 title "Ion transport regimes in chalcogenide and chalcohalide glasses: from the host to the cation-related network connectivity" @default.
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- W2070003977 doi "https://doi.org/10.1016/s0167-2738(02)00572-6" @default.
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