Synthesis and crystal structure of new carbonate NaPb2(CO3)2(OH) (original) (raw)

Abstract

Crystals of a new lead carbonate, NaPb2(CO3)2(OH), sp. gr. P_31_c, were prepared by hydrothermal synthesis. The crystal structure was established by the heavy-atom method without knowing the exact chemical formula of the compound. The polar structure of the carbonate and the distortion of the pseudosymmetry described by the supergroup P \(\bar 3\)1_c_ are caused by the acentric arrangement of the oxygen atoms providing the satisfactory coordination of Pb and Na atoms. The bonds between a hydroxyl group and two crystallographically independent Pb atoms are directed along the _c_-axis and have different lengths. The study of the carbonate by the second harmonic generation method in a temperature range of 20–250°C revealed the nonlinear optical properties comparable with the similar properties of quartz. The comparison of the structure of the new carbonate with a number of carbonates demonstrated that the new compound is structurally similar to ewaldite BaCa(CO3)2, diorthosilicate NaBa3[Si2O7](OH), and Ba[AlSiO4]2 containing a double silicon—oxygen layer.

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Authors and Affiliations

  1. Faculty of Geology, Moscow State University, Vorob’evy gory, Moscow, 119899, Russia
    E. L. Belokoneva, A. G. Al’-Ama, O. V. Dimitrova, V. S. Kurazhkovskaya & S. Yu. Stefanovich

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  1. E. L. Belokoneva
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  2. A. G. Al’-Ama
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  3. O. V. Dimitrova
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  4. V. S. Kurazhkovskaya
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  5. S. Yu. Stefanovich
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Translated from Kristallografiya, Vol. 47, No. 2, 2002, pp. 253–258.

Original Russian Text Copyright © 2002 by Belokoneva, Al’-Ama, Dimitrova, Kurazhkovskaya, Stefanovich.

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Belokoneva, E.L., Al’-Ama, A.G., Dimitrova, O.V. et al. Synthesis and crystal structure of new carbonate NaPb2(CO3)2(OH).Crystallogr. Rep. 47, 217–222 (2002). https://doi.org/10.1134/1.1466495

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