Experimental investigation and thermodynamic evaluation of the CsNO3-LiNO3-NaNO3 ternary system

The alkali nitrate mixtures are promising phase change materials (PCMs) in the temperature range (373?573) K for development of thermal storage systems. In this context, their thermochemical properties and diagrams which provide useful information needed better use. present paper, based on cesium nitrate, lithium sodium studied by both experimental optimization techniques. Thus, a critical analysis thermodynamic data from literature sources phases CsNO3-LiNO3-NaNO3 ternary system including pure components is performed. Therefore, reliable (enthalpy temperature) nitrates CsNO3, LiNO3 NaNO3 proposed. addition, means differential (DTA), binary CsNO3-LiNO3 two vertical sections (XCsNO3/XLiNO3= 1 XNaNO3= 0.2) investigated. X-ray diffraction (XRD) technique also used to analyze at room temperature. characterized congruent equimolar compound Cs0.5Li0.5NO3 appears (334 ± 2) K. Two eutectic reactions found (445 (435 K, respectively. exhibits plateau (427 corresponding polymorphic transition CsNO3. shows (408 (405 Combining our results with available literature, an parameters performed help Calphad approach. A reasonable agreement between calculated obtained.