Abstract
The temperature dependence of the Raman spectra of NaNO3–KNO3 was employed to follow structural phase transitions of mixed crystals with different compositions. Solid solutions in the NaNO3 terminal phase behaved like NaNO3 I, solid solutions in the KNO3 terminal phase behaved like KNO3 I and solid solutions in the intermediate phase appeared to be a mixture of NaNO3 I and KNO3 I on the scale of a few tens to hundreds of nanometers. The three different behaviours of the solid solutions below the solidus suggest that NaNO3–KNO3 might well be regarded as a system with limited solid solutions instead of a continuous series of solid solutions. The limited solid solution model seems to be more consistent with the phase diagrams obtained by differential scanning calorimetry. Copyright © 1999 John Wiley & Sons, Ltd.
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