Off-Center Ions in Crystal Lattices.
Final scientific rept. 1 Oct 68-30 Sep 70,
MILAN UNIV (ITALY) ISTITUTO DI FISICA
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Results under the contract concern, on one hand the individual dynamical properties of off-center ions as well as their collective behavior in polar crystals on the other hand, the effects of the electron-phonon interaction, with a view to the Jahn-Teller effect and phononinduced polarizability of a trapped electron. Furthermore, the Dynamical Properties of Interstitials are briefly discussed, in connection with infrared and optical response. Particular attention was paid to the collective behavior of off-center substitutional defects in order to understand the conditions for the appearance of a ferroelectric order in a dilute system of randomly distributed centers in ionic crystals. The report discusses other preliminary results obtained following a new line of research, which is in progress now, i.e. surface dynamics surface phonons, adsorption and catalytic behavior. Author
- Physical Chemistry
- Solid State Physics