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Title: Vibrational spectra of some hexafluorometallates (IV)
Author: Butucelea, A.
Awarding Body: University of Glasgow
Current Institution: University of Glasgow
Date of Award: 1972
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Vibrational spectra of some hexafluorosilicates, -germanates, and -manganates(IV), with general formula A2MF6, were recorded in solid state, with emphasis on the far-infrared region of wavelengths. The spectra were obtained with a Fourier Transform Interferometer and a Cary 81 Raman Spectrometer having an He-Ne laser as exciting source. Many of these spectra are reported for the first time. They are discussed in terms of factor group analysis, of which an up-to-date survey is made in Chapter 1. Factor group analyses are carried out for 4 of the most frequently encountered crystalline structures of A2 MF6 compounds, i.e. O5h, D33d, C46v and D23 space group (Chapter 3) and the results are compered with the experimental spectra (Chapter 5). Lattice modes and the behaviour of all vibrational modes under the particular symmetries of the molecular species in the crystal are largely discussed. Force constants are calculated by a least square procedure according to a computer program written by the author (Chapter 6). The calculated force constants are used to explain the experimental vibrational spectra of the A2MF6 compounds investigated, especially in the lattice frequency region, and to draw some conclusions about the nature of the bonding in these compounds (Chapter 7).
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available