biostudies-literatureUnknown11(1)Majzlan JThe double sulfates with the general formula Na₂M²⁺(SO₄)₂·<i>n</i>H₂O (M = Mg, Mn, Co, Ni, Cu, Zn, <i>n</i> = 2 or 4) are being considered as materials for electrodes in sodium-based batteries or as precursors for such materials. These sulfates belong structurally to the blödite (<i>n</i> = 4) and kröhnkite (<i>n</i> = 2) family and the M cations considered in this work were Mg, Mn, Co, Ni, Cu, Zn. Using a combination of calorimetric methods, we have measured enthalpies of formation and entropies of these phases, calculated their Gibbs free energies (Δ_f <i>G</i>°) of formation and evaluated their stability with respect to Na₂SO₄, simple sulfates MSO₄·<i>x</i>H₂O, and liquid water, RSC advances374-379https://www.ebi.ac.uk/biostudies/studies/S-EPMC8691025biostudies-literatureThermodynamics of the double sulfates Na₂M²⁺(SO₄)₂·<i>n</i>H₂O (M = Mg, Mn, Co, Ni, Cu, Zn, <i>n</i> = 2 or 4) of the blodite-krohnkite family.PMC8691025Majzlan JDachs EMarinova DfalseThermodynamics of the double sulfates Na₂M²⁺(SO₄)₂·<i>n</i>H₂O (M = Mg, Mn, Co, Ni, Cu, Zn, <i>n</i> = 2 or 4) of the blodite-krohnkite family.The double sulfates with the general formula Na₂M²⁺(SO₄)₂·<i>n</i>H₂O (M = Mg, Mn, Co, Ni, Cu, Zn, <i>n</i> = 2 or 4) are being considered as materials for electrodes in sodium-based batteries or as precursors for such materials. These sulfates belong structurally to the blödite (<i>n</i> = 4) and kröhnkite (<i>n</i> = 2) family and the M cations considered in this work were Mg, Mn, Co, Ni, Cu, Zn. Using a combination of calorimetric methods, we have measured enthalpies of formation and entropies of these phases, calculated their Gibbs free energies (Δ_f <i>G</i>°) of formation and evaluated their stability with respect to Na₂SO₄, simple sulfates MSO₄·<i>x</i>H₂O, and liquid water, 2020-01-01T00:00:00Z2020 Dec2025-04-05T13:07:53.374Z2025-04-05T13:07:53.374ZS-EPMC86910253542306410.1039/d0ra09501j