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EPR study of coordination of Ag and Pb cations in BaB2O4 crystals and barium borate glasses

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Abstract

It is shown the possibility to determine the coordination of paramagnetic ions in disordered solid structures, e.g., in barium borate glasses. For this purpose the electron paramagnetic resonance (EPR) method was used to study α-and β-BaB2O4 crystals and glasses of 45·BaO × 55·B2O3 and 40·BaO × 60·B2O3 (mol%) composition activated by Ag+ and Pb2+ ions. After the samples were exposed to X-rays at 77 K, different EPR centers were observed in them. In α-and β-BaB2O4 crystals and glasses the EPR centers Ag2+, Ag0, Pb+, Pb3+, and hole centers of O− type were studied. The EPR parameters of these centers and their arrangement in crystal structure were determined. It is shown that Pb3+ ions in β-BaB2O4 crystals occupy Ba2+ position in an irregular polyhedron from the eight oxygen, whereas in α-BaB2O4 crystals they occupy Bа2 position in a sixfold coordination. Pb+ ions in α-BaB2O4 crystals occupy Bа1 position in a ninefold coordination from oxygen. In barium borate glasses, Pb3+ ions were studied in coordination polyhedron from six oxygen atoms and in a polyhedron from nine to ten oxygen atoms. It is assumed that the established difference in the structural position of Pb3+ ions in glasses is due to their previous incorporation in associative cation–anion complexes (AC) and “free” structure-forming cations (FC). Computer simulations have been performed to analyze the stability of specific associative complexes and to compare their bond lengths with experimental data.

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Acknowledgments

The study was supported by grants 04-05-64438, 07-05-00113 from the Russian Foundation for Basic Research and grant 155 from the Siberian Branch of the RAS.

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Authors and Affiliations

  1. Laboratory of Crystal Growth, Institute of Geology and Mineralogy SB RAS, Russkaya st. – 43, 630058, Novosibirsk, Russia

    V. P. Solntsev, R. I. Mashkovtsev, A. V. Davydov & E. G. Tsvetkov

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  1. V. P. Solntsev
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  2. R. I. Mashkovtsev
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  3. A. V. Davydov
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  4. E. G. Tsvetkov
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Correspondence to V. P. Solntsev.

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Solntsev, V.P., Mashkovtsev, R.I., Davydov, A.V. et al. EPR study of coordination of Ag and Pb cations in BaB2O4 crystals and barium borate glasses. Phys Chem Minerals 35, 311–320 (2008). https://doi.org/10.1007/s00269-008-0224-8

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  • DOI: https://doi.org/10.1007/s00269-008-0224-8

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