COLOR-CENTERS IN MIXED-CRYSTALS OF ALKALI SILVER-HALIDES AND AMMONIUMSILVER-HALIDES

ESR study was executed on the mixed crystal of rubidium silver iodide and ammonium silver iodide. In (Rb-0.5(NH4)(0.1))(2)AgI3 gamma-rayed a t 77 K, I-2(-) was On the horizontal edge of the iodine tetrahedron th at chained by each other in the direction parallel with the b-axis of the crystal. I-0 was on one of the iodine ion on the horizontal edge o f the iodine tetrahedron and slig,htly distributed to one of near ammo nium ions. Their hyperfine parameters were approximately the same as t hose in the ammonium silver iodide or alkali silver iodides. I-2(-) : \A(parallel to)\ = 42.0 mT, \A(perpendicular to)\ = 19.5 mT, g(paralle l to) = 1.91, g(perpendicular to) = 2.57. I-0: \A(parallel to)\ = 51.0 mT, \A(perpendicular to)\ = 21.0 mT, g(parallel to) = 1.99, g(perpend icular to) = 2.26. The I-2(-) and I-0 were thermally more stable than those in the each component crystal.