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On the Crystal Chemistry of the First Lead Zinc Silicon Tellurium Oxyde PbZn

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Zur Kristallchemie des ersten Blei-Zink-Silicium-Telluroxids:

PbZn

4

SiTeO

10

On the Crystal Chemistry of the First Lead Zinc Silicon Tellurium Oxyde PbZn

4

SiTeO

10

B. Wedel

b;

, K. Sugiyama

a

, K. Hiraga

a

, K. Itagaki

b

aTohoku University, Institute for Material Research,

bTohoku University, Institute for Advanced Materials Processing, Katahira 2-1-1, Aoba-Ku, Sendai 980-8577, Japan

Z. Naturforsch.54 b,469–472 (1999); eingegangen am 3. Dezember 1998 Lead, Zinc, Silicon, Tellurium, Crystal Structure

Single crystals of the new lead zinc silicon tellurium oxide PbZn4SiTeO10have been prepared by solid state reaction in air. The compound is colourless and crystallizes in orthorhombic symmetry, space group D162hPnma, with the cell parameters: a = 6.542 (5), b = 15.624(4), c = 8.280(4) ˚A, 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(F2) = 0.050. Zn2+and Si4+show tetrahedral and Te6+octahedral coordination by O2 .The crystal structure is dominated by a13[Zn4O10]12 framework with isolated TeO66+ and SiO44+ polyhedra. Pb2+ ions are incorporated in the network. The centres of negative charge of the lone pairs of Pb2+are estimated by calculations of the Coulomb term of the lattice energy.

* Sonderdruckanforderungen an Dr. B. Wedel. Fax: 0081-22-217-5211, e-mail: boris@ibis.iamp.tohoku.ac.jp

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