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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