New silicate-germanate Cs2Pb2[(Si0.6Ge0.4)2O7] from the series A2Pb2[B2O7], A = K,Cs, B = Si,Ge with the umbrella-like [PbO3]4- group |
| |
| Institution: | 1. Department of Crystallography, Faculty of Geology, Lomonosov Moscow State University, Moscow, Leninskije Gory 1, 119992 GSP-2, Russia;2. Laboratory of Functional Materials, Faculty of Chemistry, Lomonosov Moscow State University, Moscow, Leninskije Gory 1, 119992 GSP-2, Russia;1. Chemistry Department, Moscow State University, 119991 Moscow, Russia;2. RUDN University, 117198 Moscow, Russia;3. Research Center for Functional Materials, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki, 305-0044, Japan;1. Innovation Centre - Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia;2. Department of General and Inorganic Chemistry, Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia;3. Faculty of Mining and Geology, University of Belgrade, Đušina 7, 11000 Belgrade, Serbia;4. Faculty of Physical Chemistry, University of Belgrade, Studentski trg 16, 11000 Belgrade, Serbia;1. Institute of Applied Physics, Academy of Sciences of Moldova, Academiei 5, MD2028 Chisinau, Republic of Moldova;2. Institute of Chemistry, Academy of Sciences of Moldova, Academiei 3, MD2028 Chisinau, Republic of Moldova;3. Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, D-52074 Aachen, Germany;4. Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, 3012 Bern, Switzerland;5. Université Catholique de Louvain, Institute of Condensed Matter and Nanosciences, Molecules, Solids and Reactivity (IMCN/MOST), Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium;1. Department of Crystallography, Faculty of Geology, Lomonosov Moscow State University, Moscow, Leninskije Gory 1, 119992, GSP-2, Russia;2. Department of Mineralogy, Faculty of Geology, Lomonosov Moscow State University, Moscow, Leninskije Gory 1, 119992, GSP-2, Russia |
| |
| Abstract: | New silicate-germanate Cs2Pb2(Si0.6Ge0.4)2O7] was synthesized in multi-components hydrothermal solution with 20 w.% concentration of Cs2CO3 mineralizer, pH = 10. Novel mixed compound belongs to the structure type A2Pb2B2O7] previously indicated for powders with A = K, B=Si or Ge. Singe crystal structure determination of Cs2Pb2(Si0.6Ge0.4)2O7] revealed the need for the correction of the space group of the earlier suggested structural model from P-3 to P-3m1, as well as for the splitting of the Pb-atom position. Umbrella-like groups PbO3]4- are located between (Si,Ge)O4]4- tetrahedra in mica-like honeycomb layers and play the role of tetrahedra with the Pb-lone-pair as the forth apex. Crystal chemical comparison revealed similarities and differences with the classical structure type of α-celsian BaAl2Si2O8] with the tetrahedral double layer. Recently investigated nonlinear optical acentric borates Pb2(BO3)(NO3) and Pb2(BO3)Cl are both related to this structural type, possessing umbrella-like groups PbO3]4- and honeycomb layers Pb2(BO3)]+ with the BO3-triangles on the tetrahedral positions. |
| |
| Keywords: | Hydrothermal synthesis Single crystal structure Structural relations |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
