Raman Scattering and Lattice-Dynamical Calculations of Crystalline KNO\u3csub\u3e3\u3c/sub\u3e

The Raman spectrum of a KNO3 single crystal was measured at both room and liquid-nitrogen temperatures. Lattice-dynamical calculations, based on the rigid-ion approximation and empirical potentials, were performed. The possibility of a phase transition at 217 K was investigated by measuring the temperature dependence of the Raman spectrum