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NdSe 1,9  has been prepared as grey, strongly reflecting platelets by reaction of elemental neodymium with selenium in the ratio 1 :2 and subsequent chemical vapour phase transport with iodine. It crystallizes in the tetragonal space group P4 2 /n with a = 925.36(7), c = 1679.2(3) pm and Z = 20. The structure determination results in a formulation of NdSe 1,9  as Nd  20 (Se(I) 2 ) 8 Se(I) 2 ⃞ 2 Se(II) 20 , where the defect layer built from the Se(I) 2  2-  and Se(I) 2-  ions corresponds to the F layer in the PbFCl substructure.

Darstellung und Kristallstruktur von NdSe 1,9 / Preparation and Crystal Structure of NdSe 1,9