Phase diagram of NaNO/sub 3//KNO/sub 3/

The binary phase diagram of NaNO/sub 3/ and KNO/sub 3/ was studied using differential scanning calorimetry (DSC). The phase diagram was modeled with regular solution theory. By fitting the model to the minimum melting point of the system, the regular solution parameters and the heats of mixing for solid solutions of NaNO/sub 3/ and KNO/sub 3/ were estimated. Good agreement was obtained between our data for the liquidus, the previously determined liquidus, and the liquidus calculated from the model.