Abstract
We have measured infrared reflectivity and Raman scattering spectra of $\mathrm{Na}\mathrm{Ti}{\mathrm{Si}}_{2}{\mathrm{O}}_{6}$ at different temperatures. We have observed almost all infrared and Raman active modes predicted by factor-group analysis for monoclinic symmetry of $\mathrm{Na}\mathrm{Ti}{\mathrm{Si}}_{2}{\mathrm{O}}_{6}$. The infrared-active phonon frequencies are obtained by Kramers-Kronig analysis of the reflectivity data. The assignment of the observed modes is done using lattice dynamical calculations based on the valence shell model. A phase transition at about $210\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ is manifested through a dramatic change of the mode frequency and broadening, and the appearance of new phonon modes. Analyzing the phonon frequency and damping vs temperature we have found that the phase transition leaves a fingerprint in the phonon dynamics of $\mathrm{Na}\mathrm{Ti}{\mathrm{Si}}_{2}{\mathrm{O}}_{6}$.
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