Abstract
Raman spectroscopy was employed to investigate the eutectic system of LiNO 3–KNO 3. A new metastable compound was identified by comparison between the spectra of the quenched and naturally cooled samples. The existence of the new compound suggested that LiNO 3–KNO 3 is a simple syntectic system with a congruently melting compound KLi(NO 3) 2 instead of a eutectic system. Analysis of the Raman spectrum indicated that KLi(NO 3) 2 has a crystal structure with nitrate ions on two distinct crystallographic sites similar to that found in the structure of KAg(NO 3) 2. These studies emphasized the value of Raman spectroscopy as a complementary tool to DSC and XRD for phase equilibrium studies.
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