biostudies-literatureWildner MAustrian Science Fund FWF194-203https://www.ebi.ac.uk/biostudies/studies/S-EPMC8895014biostudies-literatureUnknown9(Pt 2)Monohydrate sulfate kieserites (<i>M</i> ²⁺SO₄·H₂O) and their solid solutions are essential constituents on the surface of Mars and most likely also on Galilean icy moons in our solar system. Phase stabilities of end-member representatives (<i>M</i> ²⁺ = Mg, Fe, Co, Ni) have been examined crystallographically using single-crystal X-ray diffraction at 1 bar and temperatures down to 15 K, by means of applying open He cryojet techniques at in-house laboratory instrumentation. All four representative phases show a comparable, highly anisotropic thermal expansion behavior with a remarkable negative thermal expansion along the monoclinic <i>b</i> axis and a pronounced anisotropic expansion perpendicular to it. The lattice changes down to 15 K corresponIUCrJCrystallography relevant to Mars and Galilean icy moons: crystal behavior of kieserite-type monohydrate sulfates at extraterrestrial conditions down to 15 K.PMC8895014P 29149-N29Miletich RZakharov BABogdanov NEBoldyreva EVTalla DWildner MfalseCrystallography relevant to Mars and Galilean icy moons: crystal behavior of kieserite-type monohydrate sulfates at extraterrestrial conditions down to 15 K.Monohydrate sulfate kieserites (<i>M</i> ²⁺SO₄·H₂O) and their solid solutions are essential constituents on the surface of Mars and most likely also on Galilean icy moons in our solar system. Phase stabilities of end-member representatives (<i>M</i> ²⁺ = Mg, Fe, Co, Ni) have been examined crystallographically using single-crystal X-ray diffraction at 1 bar and temperatures down to 15 K, by means of applying open He cryojet techniques at in-house laboratory instrumentation. All four representative phases show a comparable, highly anisotropic thermal expansion behavior with a remarkable negative thermal expansion along the monoclinic <i>b</i> axis and a pronounced anisotropic expansion perpendicular to it. The lattice changes down to 15 K correspon2022-01-01T00:00:00Z2022 Mar2025-04-04T07:48:07.712Z2025-04-04T07:48:07.712ZS-EPMC88950143537150110.1107/S2052252521012720