Abstract
The crystal structures of the tetraborates MB4O7 were investigated at room temperature for M = Sr, Pb, Ba and at 100 K for M = Pb, Ba. The influence of the lone electron pair of Pb2+ in PbB4O7 can be studied by comparing the isostructural compounds PbB4O7 and SrB4O7. The lone pair shows a clear displacement of the lead atom which increases upon cooling. In contrast with the Sr and Pb compounds, BaB4O7 crystallizes in a centrosymmetric structure. However, this structure seems to be on the border of stability, as we find strong internal stress.
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Stein, WD., Liebertz, J., Becker, P. et al. Structural investigations of the tetraborates MB4O7 (M = Pb, Sr, Ba). Eur. Phys. J. B 85, 236 (2012). https://doi.org/10.1140/epjb/e2012-21062-y
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DOI: https://doi.org/10.1140/epjb/e2012-21062-y