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Temperature Dependence of Raman Scattering and Partial Disorder in AgI Crystals
Author(s) -
Mariotto G.,
Fontana A.,
Cazzanelli E.,
Fontana M. P.
Publication year - 1980
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221010136
Subject(s) - silver iodide , raman scattering , raman spectroscopy , phonon , polarization (electrochemistry) , liquid helium , chemistry , condensed matter physics , phase transition , scattering , x ray raman scattering , spectral line , molecular physics , materials science , helium , physics , optics , organic chemistry , layer (electronics) , astronomy , silver halide
A detailed study is made of vibrational dynamics in silver iodide by the temperature dependence of Raman scattering from liquid helium temperature up to melting. A complete set of data like temperature dependence of intensity of all features, of the degree of polarization of the spectra, of peak position and halfwidth clarifies the complex nature of dynamics of β‐AgI. It is shown that the anomalous features of Raman spectra are very likely due to the one‐phonon density of states connected with the onset of partial disorder in the β‐phase. In α‐phase an anomalous decrease of Raman cross section is found with increasing temperature: this effect is connected with the possibility of a continuous partial order‐disorder transition at ≈ 430 °C.