Abstract
A correlation between Szigeti effective charge and the electronic polarizability is found for the eight compounds containing divalent lead where experimental data are available. Results in Pb5Ge3O11 contribute to remove some ambiguity about the assignment of polar vibrational modes as external or internal to GeO4 and Ge2O7 entities in ferroelectric lead germanate. Complete TO-LO splittings are also deduced from infrared reflection spectra obtained at room temperature. Results are compared with previous controversial Raman measurements of the polar character of the modes including the soft mode.
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Gervais, F., Kaczmarek, W. Effective charge of divalent lead: Application to the assignment of infrared modes in ferroelectric Pb5Ge3O11 . Z. Physik B - Condensed Matter 51, 137–143 (1983). https://doi.org/10.1007/BF01308767
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DOI: https://doi.org/10.1007/BF01308767