Investigation of the TlBr0.46I0.54 – AgI phase diagram within the AgBr – AgI – TlBr – TlI system for optical materials synthesis

This article is devoted to research of the TlBr0.46I0.54 – AgI system' phase diagram as part of the AgBr – AgI – TlBr – TlI isothermal section of the Ag – Tl – Br – I concentration tetrahedron. The study was carried out by means of differential thermal and X-ray diffraction analyzes, on the basis of which homogeneous and heterogeneous regions were obtained. Within these regions as suitable compositions for the synthesis of optical crystals and ceramics as the phases and crystal lattices parameters were determined. It is possible to obtain crystals and ceramics in the range from 0 to 43 mol. % AgI in TlBr0.46I0.54. The research results made it possible to clarify the areas of crystals and ceramics synthesis within the AgBr – AgI – TlI – TlBr isothermal section. Crystals and ceramics based on the TlBr0.46I0.54 – AgI system are intended for wide application in optics and photonics of the visible, infrared and terahertz ranges.