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- W2036947764 abstract "Raman measurements are reported in the superionic conductor AgI far below and above the transition temperature ${T}_{c}=147$ifmmode^circelsetextdegreefi{}C. At ${T}_{c}$, the crystal structure changes from the low-temperature wurtzite phase to a disordered-defect body-centered cubic structure ($ensuremath{alpha}$ phase) and the conductivity increases ensuremath{cong} ${10}^{4}$ ${(mathrm{ensuremath{Omega}}mathrm{c}mathrm{m})}^{ensuremath{-}1}$. Large abrupt reversible changes in the phonon spectra are observed at ${T}_{c}$. Assuming a frequency-independent matrix element, which seems reasonable for a disordered-defect structure, we have interpreted the experimental data in terms of a frequency-dependent conductivity, $ensuremath{sigma}(ensuremath{omega})$. This $ensuremath{sigma}(ensuremath{omega})$ compares favorably with two published infrared results. However, the infrared results differ from each other in the low-frequency region (3-20 ${mathrm{cm}}^{ensuremath{-}1}$). The Raman results show much lower $ensuremath{sigma}(ensuremath{omega})$ in this low-frequency region, in agreement with one of the infrared results, and some theories (but in disagreement with other theories). The measurements show that $ensuremath{sigma}(ensuremath{omega})$ varies very little to 400ifmmode^circelsetextdegreefi{}C, and suggest that in the $ensuremath{alpha}$ phase the ${mathrm{Ag}}^{+}$ probably occupies the tetrahedral sites for a large fraction of the time." @default.
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- W2036947764 date "1977-08-15" @default.
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- W2036947764 title "Results from Raman spectra of the superionic conductor AgI" @default.
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- W2036947764 doi "https://doi.org/10.1103/physrevb.16.1416" @default.
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