## 2 Molten Salt Mixtures
### Molten Salt Mixtures' Thermophysical Properties
\begin{table}
\begin{tabular}{c c c c c c c c} \hline
**Mixture [-]** & **Type of** & **Composition** & \(T_{melt}\) & \(T_{deco}\) & \(\overset{-}{\rho}\) & \(\overset{-}{c_{p}}\) & **Refs.** \\  & **Mixture [-]** & **[\%wt.]** & [\({}^{\circ}\)C] & [\({}^{\circ}\)C] & [kg m\({}^{-3}\)] & [J kg\({}^{-1}\)\({}^{\circ}\)C\({}^{-1}\)] & \\ \hline \multicolumn{8}{c}{Nitrate-based} \\ \hline LiNaK//NO\({}_{3}\) & \multirow{2}{*}{Ternary} & 30 LiNO\({}_{3}\) & \multirow{2}{*}{118} & \multirow{2}{*}{550} & \multirow{2}{*}{1884} & \multirow{2}{*}{1580} & \multirow{2}{*}{[54; 55; 56]} \\  & & 18 NaNO\({}_{3}\) & & & & \\  & & 52 KNO\({}_{3}\) & & & & \\ \hline LiNaKCa/NO\({}_{3}\) & \multirow{2}{*}{Quaternary} & 15.5 LiNO\({}_{3}\) & \multirow{2}{*}{93} & \multirow{2}{*}{450} & \multirow{2}{*}{1803} & \multirow{2}{*}{1518} & \multirow{2}{*}{[57; 58; 59]} \\  & & 8.2 NaNO\({}_{3}\) & & & & \\  & & 54.3 KNO\({}_{3}\) & & & & & \\  & & 22 Ca (NO\({}_{3}\))\({}_{2}\) & & & & \\ \hline LiNaKNO\({}_{3}\)NO\({}_{2}\) & \multirow{2}{*}{Quaternary} & 9 LiNO\({}_{3}\) & \multirow{2}{*}{97} & \multirow{2}{*}{450} & \multirow{2}{*}{1877} & \multirow{2}{*}{1155} & \multirow{2}{*}{[60]} \\  & & 42.3 NaNO\({}_{3}\) & & & & & \\  & & 33.6 KNO\({}_{3}\) & & & & & \\  & & 15.1 KNO\({}_{2}\) & & & & & \\ \hline \multicolumn{8}{c}{Chloride-based} \\ \hline KMgCl & \multirow{2}{*}{Binary} & 62.5 KCl & \multirow{2}{*}{430} & \multirow{2}{*}{\textgreater{}} 700 & \multirow{2}{*}{1857} & \multirow{2}{*}{999} & [61; 62; 63] \\  & & 37.5 MgCl\({}_{2}\) & & & & & \\ \hline NaKMgCl & \multirow{2}{*}{Ternary} & 20.5 NaCl & \multirow{2}{*}{383} & \multirow{2}{*}{\textgreater{}} 700 & \multirow{2}{*}{1669} & \multirow{2}{*}{1024} & [35; 61] \\  & & 30.9 KCl & & & & & \\  & & 48.6 MgCl\({}_{2}\) & & & & & \\ \hline NaMgCaCl & \multirow{2}{*}{Ternary} & 39.6 NaCl & \multirow{2}{*}{407} & \multirow{2}{*}{650} & \multirow{2}{*}{2557} & \multirow{2}{*}{1104} & [64; 65; 66] \\  & & 21.4 CaCl\({}_{2}\) & & & & & \\ \hline NaKZnCl & \multirow{2}{*}{Ternary} & 7.5 NaCl & \multirow{2}{*}{204} & \multirow{2}{*}{\textgreater{}} 700 & \multirow{2}{*}{2207} & \multirow{2}{*}{901} & [62; 66; 67] \\  & & 23.9 KCl & & & & & \\  & & 68.6 ZnCl\({}_{2}\) & & & & & \\ \hline \multicolumn{8}{c}{KMgZnCl} & \multirow{2}{*}{Ternary} & 49.4 KCl & \multirow{2}{*}{356} & \multirow{2}{*}{\textgreater{}} 700 & \multirow{2}{*}{1857} & \multirow{2}{*}{866} & [61; 62; 66] \\  & & 15.5 MgCl\({}_{2}\) & & & & & \\  & & 35.1 ZnCl\({}_{2}\) & & & & & \\ \hline \multicolumn{8}{c}{Fluoride-based} \\ \hline LiNaKF & \multirow{2}{*}{Ternary} & 29.2 LiF & \multirow{2}{*}{454} & \multirow{2}{*}{\textgreater{}} 700 & \multirow{2}{*}{2109} & \multirow{2}{*}{1590} & [68; 69] \\  & & 11.7 NaF & & & & & \\  & & 59.1 KF & & & & & \\ \hline NaBF & Binary & 3 NaF & \multirow{2}{*}{385} & \multirow{2}{*}{\textgreater{}} 700 & \multirow{2}{*}{1866} & \multirow{2}{*}{1506} & [51] \\  & & 97 NaBF\({}_{4}\) & & & & & \\ \hline KBF & Binary & 13 KF & \multirow{2}{*}{460} & \multirow{2}{*}{\textgreater{}} 700 & \multirow{2}{*}{1792} & \multirow{2}{*}{1305} & [70] \\  & & 87 KBF\({}_{4}\) & & & & & \\ \hline KZrF & Binary & 32.5 KF & \multirow{2}{*}{420} & \multirow{2}{*}{\textgreater{}} 700 & \multirow{2}{*}{2680} & \multirow{2}{*}{1000} & [51] \\  & & 67.5 ZrF\({}_{4}\) & & & & & \\ \hline \multicolumn{8}{c}{Carbonate-based} \\ \hline LiNaKCO\({}_{3}\) & \multirow{2}{*}{Ternary} & 32.1 Li\({}_{2}\)CO\({}_{3}\) & \multirow{2}{*}{397} & \multirow{2}{*}{670} & \multirow{2}{*}{2038} & \multirow{2}{*}{1610} & [71] \\  & & 33.4 Na\({}_{2}\)CO\({}_{3}\) & & & & \\ \hline \end{tabular}
\end{table} 
Table 1: _Cont._Regarding the temperature working limit for these materials, a proper criterium may be to avoid the detectable production of nitrogen or NOx.