U centres in alkali iodides

Abstract

Exact changes in force constant due to H-substitution (U centres) in alkali iodides are systematically analysed using Green's function technique. NaI :H-, KI:H-, Rb1:H-, and Cs1:H-systems are considered. There is a weakening of the force constant varying from 50% to 63% depending on the mass of the neighbour in the host lattice.Die genauen Anderungen der Kraftkonstante in Alkalijodid, die durch H--Substitution (UZentren) verursacht werden, werden systematisch mit der Technik Greenscher Funktionen analysiert. Dabei werden die Systeme NaJ:H-, KJ:H-, RbJ:H-und CsJ:H-beriicksichtigt. E s nird eine Erniedrigung der Kraftkonstante zwisrhen 50% und 63% in Abhangigkeit von der Masse des Nachbarn im Wirtsgitter gefunden.

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