Abstract
Single crystals (monoclinic polyhedra up to 5×5×5 mm 3) of the thio(seleno)-hypodiphosphates Sn 2P 2S 6 (yellowish-brown), Sn 2P 2Se 6 (black), Pb 2P 2S 6 (yellow) and Pb 2P 2Se 6 (dark-red) have been grown by vapour transport with iodine. The space group of Sn 2P 2S 6 is Pc, that of the other compounds P2 1/c. All four compounds are completely miscible. Already small replacements of Sn by Pb (around 10 mole %) in Sn 2P 2S 6 change the space group to P2 1/c. The pure as well as the 1:1 mixed-anion and mixed cation compounds were characterized by x-ray and thermal analysis.
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