K band of the F center in a quaternary system

In this work is reported a F center for the first time in a quaternary syst em; mixture of four alkali halide salts, that give a crystalline material, whith a trapped electron, The optical absorption spectra is obtained shown a single F and K bands, that implies a definide lattice constant of the mat erial and a single phase, that appears clearly in the X ray difractometry s pectra. The Vegard's generalized law is extended, valid for a recently repo rted novel ternary crystal. The constant lattice, obtained by F center Moll wo-Ivey's law by X ray difractometry and the extended Vegard's generalized law are in good agreement.