“…Note that chalcogenides are often used as optical elements (prisms, gratings, lenses, monochromators, or laser-tuned devices), (photoinduced) waveguides and optical fibers, optical amplifiers and lasers, photonic switches, thermal and hyperspectral imaging devices, temperature monitors, and chemical sensors in the infrared spectral region (due to their high transparency above ∼1 μm). In addition to their optical applications, the chalcogenide glasses are also known for being employed as optical and electrical memory materials, rewritable recording materials, solid electrolytes for batteries, sensitive electrochemical electrodes, ionic or superionic superconductors, transistors, or switches (owing to their semiconducting properties). − The second reason for the crystal growth rate studies in chalcogenide materials is the utilization of that information for controlled preparation of the crystalline phase. Such preparation can be either one-shot permanent formation of the chalcogenide ceramics and glass ceramics − or reversible, such as occurring in the state-of-the-art technologies based on the chalcogenide phase-change materials (nonvolatile memories, flexible displays, nanoscale switches, energy storage), − where the amorphous-to-crystalline transformation (induced by heating, lighting, or electrical means) represents a fundamental aspect of the device functionality.…”