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Lithium calcium niobium oxide (2/1.5/3/10), Li 2 Ca 1.5 Nb 3 O 10 , has been synthesized by conventional solid-state reaction. Its structure consists of triple-layer perovskite slabs of corner-sharing NbO 6  octa­hedra inter­leaved with lithium ions; Ca cations partially occupy the perovskite  A  sites at 75% occupancy probability. All eight atoms in the asymmetric unit are on special positions: one Nb atom has site symmetry 4/ mmm ; the second Nb, both K, the Sr and two O atoms have site symmetry 4 mm ; the remaining two O atoms have site symmetries 2 mm . and  mmm ., respectively.

Li2Ca1.5Nb3O10from X-ray powder data

Li₂Ca_1.5Nb₃O₁₀from X-ray powder data