Halide-chalcogenide glasses whose properties make them suitable for applications in modern optics and optical fiber technique are investigated. The object of examination were oxygen-free glasses in the Sb↓(2)Se↓(3)-BaCl↓(2)-PbCl↓(2) system. Because of the unconventional method obtaining these glasses (great difficulties connected with passing into the glassy state) a special method of synthesizing these glasses is developed. Their characteristic temperatures and thermal stabilities are determined. Structural investigations using IR spectroscopy are carried out and the phase composition following the crystallization of the glasses is established by x-ray examination. Certain properties of the glasses are investigated, giving special consideration to the optical properties (re-fractive index and transmission in the far-IR range). The investigation results reveal the possibility of producing stable glasses, a few millimeters thick, using a special method of synthesis. The absorption bands in the IR spectra of the examined glasses are attributed to the symmetric and asymmetric vibrations of the Sb-Se-Sb bridge. The transmission range of the obtained glasses fails within the limit 0.65 to 50 μm, at the level of 38 to 60, and the refractive index is n>2.5. Material of such properties offers the possibility to obtain optical fibers of very high numerical aperture and special applications are possible because of a wide transmission range. # 1997 Society of Photo-Optical Instrumentation Engineers. S0091 -3286(97)00706-x
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