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Single crystals of Pb 2 In 2 Si 2 O 9  have been prepared by crystallisation from melts of Pb(NO 3 ) 2 , ln 2 O 3  and SiO 2 . The compound crystallizes with orthorhombic symmetry, space group C 2v  9   - Pna2 1  with the lattice constants a = 10.529(1), b = 11.372(1) and c = 7.019(3) Å, Z = 4. Despite the fact that the Kentrolite/Melanotekite structure is characterized by dissimilar occupied split positions of lead, Pb 2 In 2 Si 2 O 9  shows completely filled and ordered point positions. The location of a dot like lone pair of Pb 2+  is estimated by Coulomb term calculations of lattice energy. The results are discussed with respect to published Pb-lone pair distances using the electronic polarizability coefficient of the lone pair cation or simple geometrical considerations.

zeitschrift für naturforschung b

Zur Kenntnis eines synthetischen Kentrolits/Melanotekits des Indiums: Pb 2 In 2 Si 2 O 9  / On an Synthetic Kentrolite/Melanotekite of Indium: Pb 2 In 2 Si 2 O 9