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Single crystals of Pb 3 Ni 4.5 Te 2.5 O 15  have been prepared by heating pellets of mixtures of PbO, TeO 2  and nickel hydroxide carbonate to 730 °C in air. X-ray investigations led to hexagonal symmetry, space group d 6  6 -P6 3 22, lattice constants a = 10.2589(1), c = 13.554(5), Z = 4. Typical features of the crystal structure are face sharing TeNiO 9  octahedra doubles and planes of connected (TeO 6 ) 6  and (TeO 6 ) 3 (NiO 6 ) 3  hexagons. The one-sided coordination of lead by oxygen is complemented by the lone pair of electrons. The lone pair positions are estimated by calculations of the Coulomb terms of lattice energy.

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Verknüpfung von (TeO 6 ) 6 - und (TeO 6 ) 3 (NiO 6 ) 3 -Sechsringen durch TeNiO 9 -Oktaederdoppel in Pb 3 Ni 4,5 Te 2,5 O 15  / Connection of (TeO 6 ) 6  and (TeO 6 ) 3 (NiO 6 ) 3  Hexagons by TeNiO 9  Octahedra Double in Pb 3 Ni 4,5 Te 2,5 O 15