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Na 2 S 5  has been Synthesized from β-Na 2 S 2  and excess sulfur by a two step reaction. A solid state reaction at 200 °C was carried out, which was then followed by a melting reaction at 500 °C. X-ray investigations on single crystals revealed the structure of the α-modification. The orthorhombic unit cell contains four formula units; the space group is Pnma. The sulfur atoms form unbranched zig-zag-chains S 5  2-  in cis-conformation

Die Kristallstruktur des α-Na 2 S 5 / The Crystal Structure of α-Na 2 S 5