Abstract
Generally, sulfur is inclined to combine with oxygen to form sulfate ions in a solid-state reaction. Interestingly, an extraordinary sulfide silicate, Na6Si3S8O, was successfully obtained in a vacuum-sealed silica tube for the first time. Its crystal structure features novel 1D straight chains formed by the interconnection of tri-polymerized [Si3S8O]6- and [Na4S5O]11- units, demonstrating the first sulfide silicate exhibiting S-Na-O and S-Si-O connections without S-O bonds. Moreover, Na6Si3S8O is also verified as a promising birefringent material owing to its large birefringence (Δn = 0.215-0.094 from 0.3 to 4.0 μm).
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