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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 12,
  • Issue 9,
  • pp. 093001-
  • (2014)

Equilibrium between NO3- and NO2- in KNO3-NaNO2 melts: a Raman spectra study

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Abstract

We study ionic structure of KNO3-NaNO2 melts under air atmosphere by using Raman spectroscopy. Molar fraction of NO3- and NO2- is obtained and thermal stability of this kind of melts system is then analyzed. The results show that when the temperature is increased to a certain value, equilibrium between the decom­position of NO3- and the oxidation of NO2- exists in KNO3-NaNO2 melts. When temperature is higher than 644 K, the molar fraction of NO3- decreases a little with temperature increasing for the melts in which the initial fraction of KNO3 is 90 wt%, but for the melts in which the initial fraction of KNO3 is 10-80 wt%, the molar fraction of NO3- increases with temperature, and the increasing rate is slower for a higher initial frac­tion of KNO3. Molar fraction of NO3- increment increases linearly with initial fraction of NaNO2. The sample in which the initial fractions of NaNO2 are 11.3 and 14.5 wt% under air atmosphere shows the best thermal stability at 762 and 880 K, respectively.

© 2014 Chinese Optics Letters

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