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Charge compensation can proceed from electrons in the conduction band or in -0.06-ev traps. Heatlng in Cd vapor results in dlffusion of interstitial F- ions to the surface and electrons inward from the surface. CdF/sub 2/ is formed. In CdF/sub 2/: Sm/sup 3+/, Na/sup /, in which the substitutional Na+ compensates the charge of the Sm/sup 3+/ ion, no coloration was observed nor could pure CdP/sub 2/ crystals be colored. Freecarrier absorption was also observed in material doped with Tb and Dy. (L.N.N.)
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Kingsley et al. (1962) studied this question.
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