ABSTRACT

Due to the numerous applications of the molten salt systems (chemical processes, metallurgical research, transfert of thermal energy produced from solar radiation ), the determination of the thermodynamical functions and the study of the phase diagrams of the binary and ternary systems of alkali nitrate are important for a better exploitation of this systems. So, the heat capacities as well as the enthalpies of fusion and solid state transitions of rubidium nitrate, lithium nitrate and of the intermediate compounds Ag0.5Rb0.5NO3 and Li0.5Rb0.5NO3, in solid and liquid states, have been measured by differential scanning calorimetry (DSC). The enthalpies of formation of Ag0.5Rb0.5NO3 and Li0.5Rb0.5NO3 at 298 K have been deduced.

Compounds

#	Formula	Name
1	LiNO3	lithium nitrate
2	NO3Rb	rubidium nitrate
3	AgN2O6Rb	rubidium silver nitrate (1:1)
4	LiN2O6Rb	lithium rubidium nitrate

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Constraint	Phase	Method	#Points
POMD	1	Molar enthalpy of transition or fusion, kJ/mol ; Crystal			Crystal Liquid Air at 1 atmosphere	DSC	1
POMD	1	Triple point temperature, K ; Crystal			Crystal Liquid Air at 1 atmosphere	DTA	1
POMD	1	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Small sample (50 mg) DSC	43
POMD	1	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Small sample (50 mg) DSC	16
POMD	2	Triple point temperature, K ; Crystal 1			Crystal 1 Liquid Air at 1 atmosphere	DTA	1
POMD	2	Molar enthalpy of transition or fusion, kJ/mol ; Crystal 1			Crystal 1 Liquid Air at 1 atmosphere	DSC	1
POMD	2	Molar enthalpy of transition or fusion, kJ/mol ; Crystal 2			Crystal 2 Crystal 1 Air at 1 atmosphere	DSC	1
POMD	2	Triple point temperature, K ; Crystal 2			Crystal 2 Crystal 1 Air at 1 atmosphere	DTA	1
POMD	2	Triple point temperature, K ; Crystal 3			Crystal 3 Crystal 2 Air at 1 atmosphere	DTA	1
POMD	2	Triple point temperature, K ; Crystal 4			Crystal 4 Crystal 3 Air at 1 atmosphere	DTA	1
POMD	2	Molar enthalpy of transition or fusion, kJ/mol ; Crystal 3			Crystal 3 Crystal 2 Air at 1 atmosphere	DSC	1
POMD	2	Molar enthalpy of transition or fusion, kJ/mol ; Crystal 4			Crystal 4 Crystal 3 Air at 1 atmosphere	DSC	1
POMD	2	Molar heat capacity at constant pressure, J/K/mol ; Crystal 4	Temperature, K; Crystal 4	Pressure, kPa; Crystal 4	Crystal 4	Small sample (50 mg) DSC	23
POMD	2	Molar heat capacity at constant pressure, J/K/mol ; Crystal 3	Temperature, K; Crystal 3	Pressure, kPa; Crystal 3	Crystal 3	Small sample (50 mg) DSC	12
POMD	2	Molar heat capacity at constant pressure, J/K/mol ; Crystal 2	Temperature, K; Crystal 2	Pressure, kPa; Crystal 2	Crystal 2	Small sample (50 mg) DSC	11
POMD	2	Molar heat capacity at constant pressure, J/K/mol ; Crystal 1	Temperature, K; Crystal 1	Pressure, kPa; Crystal 1	Crystal 1	Small sample (50 mg) DSC	6
POMD	2	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Small sample (50 mg) DSC	8
POMD	3	Molar enthalpy of transition or fusion, kJ/mol ; Crystal			Crystal Liquid Air at 1 atmosphere	DSC	1
POMD	3	Triple point temperature, K ; Crystal			Crystal Liquid Air at 1 atmosphere	DTA	1
POMD	3	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Small sample (50 mg) DSC	19
POMD	3	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Small sample (50 mg) DSC	15
POMD	4	Molar enthalpy of transition or fusion, kJ/mol ; Crystal			Crystal Liquid Air at 1 atmosphere	DSC	1
POMD	4	Triple point temperature, K ; Crystal			Crystal Liquid Air at 1 atmosphere	DTA	1
POMD	4	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Small sample (50 mg) DSC	24
POMD	4	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Small sample (50 mg) DSC	6

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Heat capacities and enthalpies of fusion of lithium and rubidium nitrates. Heat capacities, enthalpies of fusion and enthalpies of formation of the intermediate compounds Ag0.5Rb0.5NO3 and Li0.5Rb0.5NO3.

Monia, H.[Hichri], Hmida, Z.[Zamali], Ismail, K.[Khattech]

ABSTRACT