Raman Scattering in the Vicinity of the Crystal-Melt Phase Transition in Alkaline Earth Metal Nitrates

摘要

Raman spectroscopy is used to study the molecular relaxation processes in the following alkaline earth metal nitrates: Ca(NO3)(2), Sr(NO3)(2), and Ba(NO3)(2). The first-order crystal-melt phase transition in calcium, strontium and barium nitrates is found to be extended. A premelting region is revealed in these alkaline earth metal nitrates. Premelting phenomena are shown to manifest themselves in the temperature dependences of spectral parameters.