The high-pressure phase diagram of synthetic epsomite (MgSO4·7H2O and MgSO4·7D2O) from ultrasonic and neutron powder diffraction measurements

Gromnitskaya, E. L.; Yagafarov, O. F.; Lyapin, A. G.; Бражкин, В. В.; Wood, I. G.; Tucker, Matthew G.; Fortes, A. Dominic

doi:10.1007/s00269-013-0567-7

Cited by 20 publications

(19 citation statements)

References 45 publications

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“…Our attention was originally drawn to this gap between n = 7 and n = 11 by high-pressure studies of MgSO 4 Á11H 2 O where we observed an apparent decomposition at $ 0.9 GPa, 240 K to a mixture of ice VI and what wasat the time -an unknown hydrate (Fortes et al, 2017). The unidentified phase did not correspond to any of the highpressure phases of MgSO 4 Á7D 2 O we had encountered in other high-pressure experiments (Gromnitskaya et al, 2013) and one possible explanation was the occurrence of an intermediate hydration state that became stable only under pressure.…”

Section: Introductionmentioning

confidence: 60%

Structure, thermal expansion and incompressibility of MgSO₄·9H₂O, its relationship to meridianiite (MgSO₄·11H₂O) and possible natural occurrences

Fortes

Knight

Wood

2017

Acta Crystallogr Sect B

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We have employed neutron and X-ray powder diffraction and density functional theory calculations to determine the structure and thermoelastic properties of a new hydrate in the MgSO4–H2O binary system, magnesium sulfate enneahydrate. We show that this 9-hydrate could occur naturally in certain hypersaline lakes on Earth and indicate where it may be formed as a more persistent mineral elsewhere in the solar system.

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Section: Introductionmentioning

confidence: 60%

Structure, thermal expansion and incompressibility of MgSO₄·9H₂O, its relationship to meridianiite (MgSO₄·11H₂O) and possible natural occurrences

Fortes

Knight

Wood

2017

Acta Crystallogr Sect B

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“…Livshits et al investigated the high-pressure behavior of epsomite and found four phase transitions, occurring at~0.4, 1.2,~1.6 and~2.5 GPa, respectively [5]. Gromnitskaya et al employed ultrasonic and neutron scattering measurements on epsomite to reveal its elastic property under a high pressure of up to~3.0 GPa, and three phase transitions were identified at pressures of~1.4,~1.6 and~2.5 GPa, respectively [6]. Grasset et al established the phase relation of MgSO 4 -H 2 O under a pressure of up to~2.0 GPa in a diamond anvil cell (DAC), but they only determined one phase transition for epsomite at~0.6 GPa [7].…”

Section: Introductionmentioning

confidence: 99%

The Phase Transition and Dehydration in Epsomite under High Temperature and High Pressure

Yang

Dai

et al. 2020

Crystals

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The phase stability of epsomite under a high temperature and high pressure were explored through Raman spectroscopy and electrical conductivity measurements in a diamond anvil cell up to ~623 K and ~12.8 GPa. Our results verified that the epsomite underwent a pressure-induced phase transition at ~5.1 GPa and room temperature, which was well characterized by the change in the pressure dependence of Raman vibrational modes and electrical conductivity. The dehydration process of the epsomite under high pressure was monitored by the variation in the sulfate tetrahedra and hydroxyl modes. At a representative pressure point of ~1.3 GPa, it was found the epsomite (MgSO4·7H2O) started to dehydrate at ~343 K, by forming hexahydrite (MgSO4·6H2O), and then further transformed into magnesium sulfate trihydrate (MgSO4·3H2O) and anhydrous magnesium sulfate (MgSO4) at higher temperatures of 373 and 473 K, respectively. Furthermore, the established P-T phase diagram revealed a positive relationship between the dehydration temperature and the pressure for epsomite.

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“…Although many studies have focused on the stability of sulfates at high pressure and temperature (Comodi et al 2008(Comodi et al , 2012Fortes et al 2013;Hawthorne 1985;Stoilova and Wildner 2004;Vance 2007;Yamamoto et al 196;Gromnitskaya et al 2013), only few studies were devoted to layered double sulfates such as blödite, mostly of which dealing with crystallographic aspects at ambient pressures (Hawthorne 1985;Stoilova and Wilder, 2004).…”

Section: Introductionmentioning

confidence: 99%

The compression behavior of blödite at low and high temperature up to ∼10 GPa: Implications for the stability of hydrous sulfates on icy planetary bodies

Comodi

Stagno

Zucchini

et al. 2017

Icarus

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Recent satellite inferences of hydrous sulfates as recurrent minerals on the surface of icy planetary bodies link with the potential mineral composition of their interior. Blödite, a mixed Mg-Na sulfate, is here taken as mineral representative of icy satellites surface to investigate its crystal structure and stability at conditions of the interior of icy bodies. To this aim we performed in situ synchrotron angle-dispersive X-ray powder diffraction experiments on natural blödite at pressures up to ~10 GPa and temperatures from ~100 K to ~570 K using diamond anvil cell technique to investigate the compression behavior and establish a low-to-high temperature equation of state that can be used as reference when modelling the interior of sulfate-rich icy satellites such as Ganymede.The experimentally determined volume expansivity, , varies from 7.6 (6) 10 -5 K -1 at 0.0001 GPa (from 199 to 413 K) to 2.6 (3) 10 -5 K -1 at 10 GPa (from 293 to 453 K) with aδ/δP coefficient = -5.6(8)10 -6 GPa -1 K -1 .The bulk modulus calculated from the least squares fitting of P-V data on the isotherm at 413 K using a second-order Birch -Murnaghan equation of state is 38 GPa, which gives the value of K/δT equal to 0.01(5) GPa -1 K -1 . The thermobaric behavior of blödite appears strongly anisotropic with c lattice parameter being more deformed with respect to a and b.Thermogravimetric analyses performed at ambient pressure showed three endotherms at 410 K, 500 K and 1000 K, with weight losses of approximately 11%, 11% and 43% caused by partial dehydration, full dehydration and sulfate decomposition. Interestingly, no clear evidence of dehydration was observed up to ~470 K and ~10 GPa, suggesting that pressure would act to stabilize the crystalline structure of blödite.The data collected allow to write the following equation of state, V(P,T) = V 0 [ 1+ 7.6(6) 10 -5 Δ T -0.026(3)P -5.6(8) 10 -6 PΔT -6.6(9) 10 -6 PT ) from which the density of blödite can be determined at conditions of the ice mantle of the large icy satellites of Jupiter. Based on current thermal models for the interior of Ganymede, for instance, blödite is predicted to remain stable with the density almost unchanged to about 1000 km in depth in equilibrium with a deep saline ocean.Blödite has higher density, bulk modulus and thermal stability than similar hydrous sulfates (e.g. mirabilite and epsomite) implying, therefore, a different contribution of these minerals to the extent of deep oceans in icy planets and their distribution over the local geotherms Keywords Blödite, high pressure, icy satellite, sulfate, in situ angle-dispersive X-ray diffraction, synchrotron. V between 119 and 433 K of 7.6 (7)10 -5 K -1 .The c lattice parameter remains the most deformable with respect to a and b that, therefore, show very similar thermal expansion values. Because the monoclinic symmetry of blödite with β angle significantly different from 90°, the principal directions of the expansion tensor should be investigated. The symmetry requires a direction parallel to b axis, and ...

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The high-pressure phase diagram of synthetic epsomite (MgSO4·7H2O and MgSO4·7D2O) from ultrasonic and neutron powder diffraction measurements

Cited by 20 publications

References 45 publications

Structure, thermal expansion and incompressibility of MgSO₄·9H₂O, its relationship to meridianiite (MgSO₄·11H₂O) and possible natural occurrences

Structure, thermal expansion and incompressibility of MgSO₄·9H₂O, its relationship to meridianiite (MgSO₄·11H₂O) and possible natural occurrences

The Phase Transition and Dehydration in Epsomite under High Temperature and High Pressure

The compression behavior of blödite at low and high temperature up to ∼10 GPa: Implications for the stability of hydrous sulfates on icy planetary bodies

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The high-pressure phase diagram of synthetic epsomite (MgSO4·7H2O and MgSO4·7D2O) from ultrasonic and neutron powder diffraction measurements

Cited by 20 publications

References 45 publications

Structure, thermal expansion and incompressibility of MgSO4·9H2O, its relationship to meridianiite (MgSO4·11H2O) and possible natural occurrences

Structure, thermal expansion and incompressibility of MgSO4·9H2O, its relationship to meridianiite (MgSO4·11H2O) and possible natural occurrences

The Phase Transition and Dehydration in Epsomite under High Temperature and High Pressure

The compression behavior of blödite at low and high temperature up to ∼10 GPa: Implications for the stability of hydrous sulfates on icy planetary bodies

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Structure, thermal expansion and incompressibility of MgSO₄·9H₂O, its relationship to meridianiite (MgSO₄·11H₂O) and possible natural occurrences

Structure, thermal expansion and incompressibility of MgSO₄·9H₂O, its relationship to meridianiite (MgSO₄·11H₂O) and possible natural occurrences