Infrared absorption (360 to 500 cm-l) is studied in ZnS crystals doped with both, lithium and a group IIIA dopant. The dominant bands in the obtained absorption spectra can be ascribed to the localized vibrational modes of two types of defects: 1) unassociated Li on a Zn site, Lizn, and 2) pairs comprising substitutional Li on a Zn site and substitutional group IIIA impurity on the nearest Zn site, MZIn-Lizn (&I = Al, Ga, or In). Li in ZnS is found to have a considerable effect on atomic interactions in the neighbouring region and, therefore, cannot be regarded as a pure mass defect.On a 6tudi6 l'absorption infra-rouge (360 to 500 cm-l) dans les cristaux de ZnS contenant comme impuret6s le lithium et en mbme temps un Blknient du groupe IIIA. Les bandes dominantes dans le spectre d'absorption ont 6t6 attribu6es aux modes localisbs des d6fauts de deux sortes: 1) Li isole dans un site de Zn, Lizn, e t 2) paires compos6ks du Li dans un site de Zn e t d'une impurit6 du groupe IIIA dans un autre site de Zn le plus proche du lithium, M&-Li&, (M = Al, Ga ou In). On a constat6 que le lithium dans ZnS perturbe considBrablement les interactions interatomiques dans son voisinage ct pour cela il ne peut pas atre trait6 comme un pur d6faut de masse.
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