Phase transitions in potassium nitrate |
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| Authors: | V V Deshpande M D Karkhanavala U R K Rao |
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| Institution: | 1. Chemistry Division, Bhabha Atomic Research Centre, 400085, Bombay, India
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| Abstract: | It is shown that the heat of transition of the phase change II → I at 129° on heating KNO3 is dependent on the thermal history of the sample, since it involves two steps, viz., II→ III and III→ I at 2° interval. During cooling, the latter step is fast and truly reversible, though with a temperature hysteresis. The former step is sluggish and is dependent both on temperature and time. Our results indicate that KNO3 can be used for calibration purpose only if the material has not been heated beyond 128° in the immediately preceding three hours. |
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