Temperature-dependent Raman spectra of mixed crystals of NaNO3–KNO3: evidence for limited solid solutions

✍ Scribed by Kangcheng Xu; Yang Chen

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 116 KB
• Volume: 30
• Category: Article
• ISSN: 0377-0486
• DOI: 10.1002/(sici)1097-4555(199903)30:3<173::aid-jrs366>3.0.co;2-2

✦ Synopsis

The temperature dependence of the Raman spectra of was employed to follow structural phase NaNO 3

-KNO 3 transitions of mixed crystals with di †erent compositions. Solid solutions in the terminal phase behaved like NaNO 3 I, solid solutions in the terminal phase behaved like I and solid solutions in the intermediate NaNO 3 KNO 3 KNO 3 phase appeared to be a mixture of I and I on the scale of a few tens to hundreds of nanometers. NaNO 3 KNO 3 The three di †erent behaviours of the solid solutions below the solidus suggest that might well be NaNO 3 -KNO 3 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 di †erential scanning calorimetry.