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- W2091342024 abstract "Mossbauer spectroscopy in $^{129}mathrm{I}$ was employed to verify the existence and investigate the properties of local disorder in the ordered state of the superionic conductor Rb${mathrm{Ag}}_{4}$${mathrm{I}}_{5}$. Studies were conducted in the temperature range of 4-180 K covering the low-temperature $ensuremath{gamma}$ phase ($Tl122$ K) and part of the high-conductivity, disordered $ensuremath{beta}$ phase. The absorption spectra at all temperatures were analyzed with two iodine sites, characterized by their quadrupole splitting and isomer-shift values and a third site with a nonsplit single line. It was found that the electric field gradient (efg) at the $^{129}mathrm{I}$ nucleus, produced by the neighboring Ag ions, has a continuous linear temperature dependence down to 4.2 K. The hyperfine constants and the Debye-Waller factor showed no discontinuity at ${T}_{c}$. The anomalous existence of the single line has been attributed to a fast fluctuating efg due to local hopping of the Ag ions. This dynamic disorder is present even at low temperatures where (8-10)% of Ag ions are locally hopping, and its occurrence increases drastically at $Tg{T}_{c}$. A nonharmonic Debye-Waller factor was observed from which a linear temperature-dependent Debye temperature could be derived." @default.
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- W2091342024 date "1983-07-01" @default.
- W2091342024 modified "2023-09-24" @default.
- W2091342024 title "Microscopic view of disorder in the ordered phase of superionic RbAg4I5" @default.
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- W2091342024 doi "https://doi.org/10.1103/physrevb.28.82" @default.
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