A detailed analysis of the melting point and thermal degradation of a ternary mixture of carbonates to which various percentages of NaOH were added is presented. To this end, Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA) were carried out. Experimental results show that the melting point of the prepared salts can be down to below 450 °C with their decomposition temperatures around 900°C. The new kinds of mixed molten salts have a lower melting point and a slightly higher decomposition temperature, but the obtained improvements are not as large as expected. Therefore, it can be concluded that NaOH does not substantially improve the temperature operation range of the initial carbonate mixture.

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