Crystallography relevant to Mars and Galilean icy moons: Crystal behavior of kieserite-type monohydrate sulfates at extraterrestrial conditions down to 15 K

Manfred Wildner, Boris A. Zakharov, Nikita E. Bogdanov, Dominik Talla, Elena V. Boldyreva, Ronald Miletich

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

Аннотация

Monohydrate sulfate kieserites (M2+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 (M2+= 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 b axis and a pronounced anisotropic expansion perpendicular to it. The lattice changes down to 15 K correspond to an 'inverse thermal pressure' of approximately 0.7 GPa, which is far below the critical pressures of transition under hydrostatic compression (Pc≥ 2.40 GPa). Consequently, no equivalent structural phase transition was observed for any compound, and neither dehydration nor rearrangements of the hydrogen bonding schemes have been observed. The M2+SO4·H2O (M2+= Mg, Fe, Co, Ni) end-member phases preserve the kieserite-type C2/c symmetry; hydrogen bonds and other structural details were found to vary smoothly down to the lowest experimental temperature. These findings serve as an important basis for the assignment of sulfate-related signals in remote-sensing data obtained from orbiters at celestial bodies, as well as for thermodynamic considerations and modeling of properties of kieserite-type sulfate monohydrates relevant to extraterrestrial sulfate associations at very low temperatures.

Язык оригиналаанглийский
Страницы (с-по)194-203
Число страниц10
ЖурналIUCrJ
Том9
DOI
СостояниеОпубликовано - 1 мар 2022

Предметные области OECD FOS+WOS

  • 1.03 ФИЗИЧЕСКИЕ НАУКИ И АСТРОНОМИЯ
  • 1.04 ХИМИЧЕСКИЕ НАУКИ
  • 2.05 ТЕХНОЛОГИЯ МАТЕРИАЛОВ
  • 1.06 БИОЛОГИЧЕСКИЕ НАУКИ

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