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Free keywords:
nitrides; tantalum; lithium; crystal structure
Abstract:
The new lithium nitridotantalate(V), Li-4[TaN3], was prepared by reaction of Li-15[CrN4](2)N with the wall of a welded Ta ampoule in the presence of metallic Li at 1470 K. Li-4[TaN3] forms colourless single crystals (platelets, space group Ibca, No. 73, a = 491.85(4) pm, b = 973.59(6) pm, c = 1415.0(1) pm, Z = 8, R1 = 0.0288). The crystal structure is described as Li2O superstructure with ordered occupation of the tetrahedral sites by Li and Ta. The resulting arrangement leads to infinite chains (1)(infinity)[TaN2N2/24-] running along [100].
