. 2023 Jan 11;8(3):3339–3347. doi: 10.1021/acsomega.2c07041

SO₄^2––H₂O at 273.2 and 298.2 K and Pressure P = 94.77 kPa^a.

system	temperature T/(K)	composition of solution w(B) × 10²				Jänecke index of dry salt, J(B) (g/100 g S)				equilibrated solid phase	source
		composition of solution w(B) × 10²				J(Li₂SO₄) + J(Rb₂SO₄) + J(MgSO₄) = 100
		w(Li₂SO₄)	w(Rb₂SO₄)	w(MgSO₄)	w(H₂O)	J(Li₂SO₄)	J(Rb₂SO₄)	J(MgSO₄)	J(H₂O)
Li⁺, Rb⁺//SO₄^2––H₂O	273.2	23.06	1.36	0.00	75.58	94.43	5.57	0.00	309.50	LSH + LRH	this work
		17.72	11.94	0.00	70.34	71.67	28.33	0.00	1401.5	LRH + LR
		9.67	24.67	0.00	65.66	28.16	71.84	0.00	191.21	LR + RS
	298.2	22.86	3.38	0.00	73.76	87.12	12.88	0.00	281.10	LSH + LRH	ref.²⁰
		17.02	14.33	0.00	68.65	54.29	45.71	0.00	218.98	LRH + LR
		6.28	31.11	0.00	62.61	16.80	83.20	0.00	167.45	LR + RS
Rb⁺, Mg²⁺//SO₄^2––H₂O	273.2	0	2.47	20.56	76.97	0	5.14	94.86	334.22	M₇ + RM	this work
	273.2	0	26.92	0.23	72.85	0	98.15	1.85	268.32	RM + RS	this work
	298.2	0	4.31	26.75	68.94	0	6.77	93.23	221.96	M₇ + RM	ref. 21
	298.2	0	31.69	0.63	67.68	0	95.80	4.20	209.41	RM + RS	ref. 21

w(M) is the mass fraction of M; standard uncertainties u are u(T) = 0.20 K; u(Li⁺) = 0.0050; u(Rb⁺) = 0.0061; u(Mg²⁺) = 0.0050; u(SO₄^2–) = 0.0060; LRH: 3Li₂SO₄·Rb₂SO₄·2H₂O; RM: Rb₂SO₄·MgSO₄·6H₂O; LR: Li₂SO₄·Rb₂SO₄; M₇: MgSO₄·7H₂O; LSH: Li₂SO₄·H₂O; and RS: Rb₂SO₄.

Table 6. Invariant Points of the Subsystems of the Quaternary System Li+, Rb+, Mg2+//SO42––H2O at 273.2 and 298.2 K and Pressure P = 94.77 kPaa.

Table 6. Invariant Points of the Subsystems of the Quaternary System Li⁺, Rb⁺, Mg²⁺//SO₄^2––H₂O at 273.2 and 298.2 K and Pressure P = 94.77 kPa^a.