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Lattice dynamical study of alkali metal sulfates and potassium nitrate
Abstract
This dissertation is a study of the lattice dynamical properties of alkali metal sulfates and potassium nitrate by Raman scattering measurements and lattice dynamical calculation. The Raman spectra of these crystals were measured at both room and liquid nitrogen temperatures. The vibrational frequencies of these crystals were calculated using two different approaches. One used Gordon-Kim potentials and the other used empirical potentials. Both calculations are based on the rigid ion pair potential approximation. Comparisons between the experimental and calculated results are discussed. Lattice dynamical properties of the alkali metal sulfates are discussed in terms of the electronegativities and ionic radii of the alkali metal ions. Strong background in the low frequency region of the Raman spectra and other evidence anharmonicity were found for potassium nitrate. Some of these features are explained in terms of the distortion of rotations of the nitrate ions around the b axis.
Subject Area
Condensation
Recommended Citation
Liu, Ding, "Lattice dynamical study of alkali metal sulfates and potassium nitrate" (1990). ETD collection for University of Nebraska-Lincoln. AAI9108230.
https://digitalcommons.unl.edu/dissertations/AAI9108230