FREEZING POINTS OF BINARY NITRATE MELTS

The freezing points of AgNO/sub 3/-(NO/sub 3/)/sub 2/, AgNO/sub 3/ letting the temperature fall at an initial rate of approximately 0.5 deg C/ min. Undercooling was generally less than 0.5 deg C and the upper-melting point or thaw point was found by heating a mixture of liquid and crystals above the point of complete liquefaction, and extrapolating the segments of the heating curve. With dilute solutions, the freezing point and upper melting point were found to be the same within 0.01 deg C. The eutectic point of the system AgNO/sub 3/- Ba(NO/sub 3/)/sub 2/ was found to be 208.0 deg C at 0.99 M%. The eutectic point of the system 10.1 M%. The eutectic point of the system AgNO/sub 3/-Mg(NO/sub 3/ )sub 2/ was estimated to be 159.5 deg C at 22.1 M %. (W.L.H.)