The physicochemical properties of crystals of AgClxBr1−x solid solutions and new AgBrxI1−x, Ag1−xTlxBr1−xIx, and Ag1−xTlxBr1−0.54xI0.54x crystals grown by the Bridgman method using equipment created at the Ural Federal University are studied herein. The crystal compositions are determined from the region of existence of solutions stable at room temperature using the state diagrams of the AgCl–AgBr, AgBr–AgI, AgBr–TlI, and AgBr–(TlBr0.46I0.54) systems studied here. The refractive indices are determined by Michelson interferometry and by a spectroscopic method using an infrared (IR) Fourier spectrometer in the wavelength range from 0.632 to 14.0 μm. Accordingly, the transmission spectra of the crystals and light guides in the range from 0.19 to 41.6 μm are measured, and their mechanical properties are studied. The photon structure of IR light guides is simulated.
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