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Z. Naturforsch. 2014, 69b, 845 – 850
doi:10.5560/ZNB.2014-4125
Synthesis and Characterization of the New Lead Strontium Germanate PbSrGeO4
Lucas L. Petschnig1, Klaus Wurst1, Lukas Perfler2, Dirk Johrendt3, and Hubert Huppertz1
1 Institut für Allgemeine, Anorganische und Theoretische Chemie, Leopold-Franzens-Universität Innsbruck, Innrain 80–82, A-6020 Innsbruck, Austria
2 Institut für Mineralogie und Petrographie, Leopold-Franzens-Universität Innsbruck, Innrain 52f, A-6020 Innsbruck, Austria
3 Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstraße 5–13, D-81377 München, Germany
Reprint requests to H. Huppertz. E-mail: Hubert.Huppertz@uibk.ac.at
Received June 13, 2014 / published online August 12, 2014
The new lead strontium germanate PbSrGeO4 was synthesized by a high-temperature solid-state reaction of lead(II) oxide, strontium carbonate, and germanium(IV) oxide at a temperature of 900 °C in a platinum crucible. The compound crystallizes in the orthorhombic space group P212121 (no. 19) being isotypic to the structure of BaNdGaO4 []. The primitive cell contains four formula units with lattice parameters of a = 995.40(2), b = 732.44(2), c = 599.42(2) pm, V = 437.02(2) Å3, and residuals of R1 = 0.0385 and wR2 = 0.0997 for all data. The main structural element of PbSrGeO4 is an isolated [GeO4]4− tetrahedron. A circular arrangement of six of these [GeO4]4− tetrahedra leads to the formation of large channels along b in which the strontium cations are eightfold coordinated by oxygen atoms. The lead cations are coordinated by three oxygen atoms, and with a lone pair of electrons they show a pseudo-tetrahedral coordination. Next to the structural investigations, PbSrGeO4 was characterized by Raman-spectroscopic investigations and DFT calculations.
Key words: Germanate, Crystal Structure, Solid-state Reaction, DFT Calculations
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