Stability of perchlorate hydrates and their liquid solutions at the Phoenix landing site, Mars

@article{Chevrier2009StabilityOP,
  title={Stability of perchlorate hydrates and their liquid solutions at the Phoenix landing site, Mars},
  author={V. Chevrier and J. Hanley and T. Altheide},
  journal={Geophysical Research Letters},
  year={2009},
  volume={36}
}
[1] We studied the low-temperature properties of sodium and magnesium perchlorate solutions as potential liquid brines at the Phoenix landing site. We determined their theoretical eutectic values to be 236 ± 1 K for 52 wt% sodium perchlorate and 206 ± 1 K for 44.0 wt% magnesium perchlorate. Evaporation rates of solutions at various concentrations were measured under martian conditions, and range from 0.07 to 0.49 mm h ―1 for NaClO 4 and from 0.06 to 0.29 mm h ―1 for Mg(ClO 4 ) 2 . The… Expand

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References

SHOWING 1-10 OF 33 REFERENCES
Experimental investigation of the stability and evaporation of sulfate and chloride brines on Mars
Abstract We have investigated the evaporation of concentrated magnesium and ferrous sulfate, and magnesium and ferric chloride brines as possible sources for liquid water on the surface of Mars, withExpand
Low temperature aqueous ferric sulfate solutions on the surface of Mars
[1] We have studied the low-temperature properties of ferric sulfate Fe 2 (SO 4 ) 3 solutions as a model for potential liquid brines on the surface of Mars. Geochemical modeling demonstrates thatExpand
Viscosity of liquid ferric sulfate solutions and application to the formation of gullies on Mars
[1] We studied the viscosity of ferric sulfate Fe2(SO4)3 solutions as a model for low-temperature liquids on the surface of Mars and their implication in the formation of gullies. Viscosity variesExpand
Magnesium sulphate salts and the history of water on Mars
TLDR
It is found that crystalline structure and H2O content are dependent on temperature–pressure history, that an amorphous hydrated phase with slow dehydration kinetics forms at <1% relative humidity, and that equilibrium calculations may not reflect the true H 2O-bearing potential of martian soils. Expand
On laboratory simulation and the temperature dependence of the evaporation rate of brine on Mars
[1] We have determined the evaporation rate of brine under simulated martian conditions at temperatures from 0°C to −26.0°C as part of our efforts to better understand the stability of water on Mars.Expand
Physical and Thermodynamical Evidence for Liquid Water on Mars
Introduction: The objective of the Phoenix Mars mission is to determine if Mars’ polar region can support life. Since liquid water is a basic ingredient for life, as we know, an important goal of theExpand
Thermochemical properties of anhydrous and hydrated alkaline-earth metal and magnesium perchlorates
A low-temperature method of obtaining anhydrous magnesium, calcium, strontium, and barium perchlorates and their hydrates was developed. Hexa-Mg(ClO4)2, Sr· (ClO4)2·H2O, and Ba(ClO4)2·H2O wereExpand
The water vapour equilibria over magnesium perchlorate hydrates
The equilibrium water vapour pressures over the magnesium perchlorate hydrate systems, ·0H2O + ·2H2O, ·2H2O + ·4H2O, ·4H2O + ·6H2O, from −20 °C to 200 °C, are presented and the associatedExpand
On laboratory simulation and the evaporation rate of water on Mars
[1] In order to better understand the stability of water on Mars, and factors likely to affect that stability, we have measured the evaporation rate of water in a CO2 atmosphere at 7 mbar and ∼0°C inExpand
Review of the vapour pressures of ice and supercooled water for atmospheric applications
The vapour pressures of ice and supercooled water are reviewed with an emphasis on atmospheric applications. Parametrizations are given for the vapour pressure, molar heat capacity, and latent heatExpand
...
1
2
3
4
...