Abstract
LEAD carbonate, PbCO3, crystallizes in the potassium nitrate structure, space group D162h, with four molecules per unit cell1. From crystallographic considerations, it follows that the carbonate ion occupies a site in the lattice of which the symmetry is Cs. The degeneracies of ν3 and ν4 are removed by the perturbing crystalline field, and all the vibrational modes are active in the infra-red.
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References
Landolt-Börnstein, Zahlenwerte und Funktionen, 4 (Springer Verlag, 1955).
Haas, C., thesis, Amsterdam (1956). Shultin, A. A., Dokl. Akad. Nauk S.S.S.R., 125, 767 (1959) assigns the bans in NaNO3 to a component of Davydov splitting of the ν2 mode. This assignment is not in agreement with the temperature-dependence of the intensity which he finds.
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SCHUTTE, C., BUIJS, K. A Difference Band of a Fundamental and a Lattice Mode in the Infra-red Spectra of Lead and Other Carbonates. Nature 192, 351–352 (1961). https://doi.org/10.1038/192351a0
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DOI: https://doi.org/10.1038/192351a0
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