Phonon dispersion and β→α transition in silver iodide |
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| Authors: | W Bührer P Brüesch |
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| Institution: | Delegation für Ausbildung und Hochschulforschung, Eidg. Institut für Reaktorforschung, CH-5303 Würenlingen, Switzerland;Brown Boveri, Research Centre, CH-5401 Baden, Switzerland |
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| Abstract: | The phonon dispersion of β-AgI single crystals has been measured by inelastic neutron scattering at room temperature. The most interesting feature is a low lying optical branch at 2 meV. This mode shows a flat dispersion and has an unusually high amplitude of vibration favouring the promotion of a cation to an interstitial site. It is shown that this mode is essential for the occurence of a cation order-disorder transition into a highly ionic conducting phase (α-AgI) at 147°C. |
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