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Raman spectroscopic studies of mixed crystals of NaNO 3 –KNO 3 quenched from different temperatures: evidence for limited solid solutions in the system
Author(s) -
Xu Kangcheng,
Chen Yang
Publication year - 1999
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/(sici)1097-4555(199906)30:6<441::aid-jrs393>3.0.co;2-x
Subject(s) - solid solution , raman spectroscopy , differential thermal analysis , diffraction , phase diagram , phase (matter) , chemistry , analytical chemistry (journal) , thermal , materials science , thermodynamics , optics , chromatography , physics , organic chemistry
Raman spectroscopy was used as a complementary tool to thermal and x‐ray methods in phase equilibrium studies of the NaNO 3 –KNO 3 system. Based on the microscopic structures of the system, the Raman technique confirned the phase diagrams obtained by thermal studies. Structural phase transitions of the R 3 m solid solutions to limited solid solutions were detected and the solid solubilities of the limited solid solutions were determined. The continuous series of solid solutions was found to consist of three slightly different structures and hence NaNO 3 –KNO 3 should be a system with limited solid solutions, which appeared to fit better than the continuous solid solution model to the reported experimental observations in Raman, differential scanning calorimetric and x‐ray diffraction studies. Copyright © 1999 John Wiley & Sons, Ltd.