CONSTITUTION DIAGRAM NaNO <sub>2</sub>-KNO <sub>3</sub>
Binary and triple melting mixes containing nitrite and nitrates of alkali metals, in particularly, sodium nitrite, potassium nitrate and sodium nitrate are widely used in chemical technology. Among such mixtures are often used binary melts containing NaNO <sub>2</sub> and KNO <sub>3</sub>. Having a number of advantages such heat-transfer agents have a tendency to slow alteration composition initiated by sodium nitrate decomposition. Sodium oxide is a product of such reaction. It forms new liquid system with components of binary melt and decrease their thermalphysic characteristics. Thus researching of such systems constitution diagrams is actual no onlyt for practical applications but for general theory. In the article lineal elements and characteristic points of constitution diagram NaNO <sub>2</sub>-KNO <sub>3</sub> based on differential thermal analysis results are represented. Experimental technique is described. Constitution diagram elements such as liquidus line, solidus line, eutectic point are characterized. Using above-listed material and some theoretical preconditions we drew a conclusion about availability of exchange reaction in the melt increasing the diagram structure and about some other researching.