Particle size and cooperative behavior effects on KNO3 phase transitions

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Abstract
Particle size effects on the phase transition temperatures of KNO3 at atmospheric pressure were characterized using heat‐flow calorimetry. The phase II–I transition temperature was relatively unaffected by particle size, whereas the phase I–III transition temperature was reduced up to 4 °C for particle sizes 3 particle sizes, it was shown that cooperative behavior played a significant, but lesser role than the KNO3 particle size in determining the phase transition temperatures. The phase II–I transition temperature increased with decreasing particle size for particle sizes 3 thin films, but exhibited significant differences when compared to reported results for KNO3 powder. The dependence of transition enthalpy on particle size for the three phase transitions is discussed and the specific heat of KNO3 powder in phase III at atmospheric pressure is reported.

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