Zur Kristallchemie des ersten Blei-Zink-Silicium-Telluroxids: PbZn₄SiTeO₁₀ / On the Crystal Chemistry of the First Lead Zinc Silicon Tellurium Oxyde PbZn₄SiTeO₁₀

<jats:p>Single crystals of the new lead zinc silicon tellurium oxide PbZn<jats:sub>4</jats:sub>SiTeO<jats:sub>10</jats:sub> have been prepared by solid state reaction in air. The compound is colourless and crystallizes in orthorhombic symmetry, space group D<jats:sup>16</jats:sup> <jats:sub>2h</jats:sub> Pnma, with the cell parameters: a = 6.542 (5), b = 15.624(4), c = 8.280(4) Å, Z = 4. The structure has been determined from a single crystal X-ray study and refined to the conventional values R = 0.032 and wR(F<jats:sup>2</jats:sup>) = 0.050. Zn<jats:sup>2+</jats:sup> and Si<jats:sup>4+</jats:sup> show tetrahedral and Te<jats:sup>6+</jats:sup> octahedral coordination by O<jats:sup>2-</jats:sup>.The crystal structure is dominated by a <jats:sup>3</jats:sup> <jats:sub>∞</jats:sub> [Zn<jats:sub>4</jats:sub>O<jats:sub>10</jats:sub>]<jats:sup>12-</jats:sup> framework with isolated TeO<jats:sub>6</jats:sub> <jats:sup>6+</jats:sup> and SiO<jats:sub>4</jats:sub> <jats:sup>4+</jats:sup> polyhedra. Pb<jats:sup>2+</jats:sup> ions are incorporated in the network. The centres of negative charge of the lone pairs of Pb<jats:sup>2+</jats:sup> are estimated by calculations of the Coulomb term of the lattice energy</jats:p>