Abstract:Sm++ ions diluted in alkali halide alloys are employed in order to determine the crystal phonon density of states a t low temperature and to probe the degree of configurational disorder in the matrices.Les proprieths optiques des ions Sma+ dblayks dans les alliages KCl,Brl--z et K,Rbl -,Cl ont permis 1'8tude de la densite des Btats des phonons des ces alliages B basse temperature ; de mbme on a mis en Bvidence le desordre de la configuration caractbristique de ces ma trices.
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