Abstract
AbstractThe temperature dependence of internal NO2 modes has been investigated by polarized Raman scattering from potassium barium nitrite single crystals. The frequencies of the symmetric stretching and bending modes are determined for the three non‐equivalent NO2 sites present at room temperature. The structural implications associated with the phase transition at about 200 K are derived from line splittings and relative intensities. The experimental results are consistent with an order–disorder transition and no soft lattice mode has been found.
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