A reactive sodium polysulfide melt provides the one-dimensional compound NaNbS6 at 350°C. It contains anionic chains of condensed NbS9 polyhedra that are separated by Na+ ions (see picture below). NaNbS6 decomposes at about 400°C and transforms into the layered intercalation compound NaNbS2.
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Bensch et al. (1998) studied this question.
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