(H3O)Fe(SO4)2 formed by dehydrating rhomboclase and its potential existence on Mars

Wenqian Xu; John B. Parise; Jonathan Hanson

doi:10.2138/am.2010.3470

(H₃O)Fe(SO₄)₂ formed by dehydrating rhomboclase and its potential existence on Mars

Wenqian Xu
, John B. Parise
, Jonathan Hanson

Geosciences

Stony Brook University
United States Department of Energy

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

Rhomboclase, (H₅O₂)Fe(SO₄) ₂·2H₂O, transforms to a solid crystalline phase, (H₃O)Fe(SO₄)₂, upon dehydration. The structure of (H₃O)Fe(SO₄)₂ is found to be the same as a recently reported structure determined from single-crystal diffraction by Peterson et al. (2009), who synthesized the same compound using a hydrothermal method. The phase boundary between rhomboclase and (H₃O)Fe(SO ₄)₂ as a function of temperature (T) and relative humidity (RH) was determined by environment-controlled in situ X-ray diffraction (XRD) method. The stability of (H₃O)Fe(SO₄)₂ against rhomboclase was further evaluated under a simulated martian condition (constant 50% RH, -20 °C, 6 mbar CO₂). Both phases remained after 14 days with no observable transition. This result suggests that hydrate ferric sulfate minerals might not respond to diurnal RH fluctuation under the extremely slowed kinetics expected on the martian surface.

Original language	English
Pages (from-to)	1408-1412
Number of pages	5
Journal	American Mineralogist
Volume	95
Issue number	10
DOIs	https://doi.org/10.2138/am.2010.3470
State	Published - Oct 2010

Keywords

Ferric sulfate
Humidity
Hydrate
Mars
Rhomboclase
Sulfate

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title = "(H3O)Fe(SO4)2 formed by dehydrating rhomboclase and its potential existence on Mars",

abstract = "Rhomboclase, (H5O2)Fe(SO4) 2·2H2O, transforms to a solid crystalline phase, (H3O)Fe(SO4)2, upon dehydration. The structure of (H3O)Fe(SO4)2 is found to be the same as a recently reported structure determined from single-crystal diffraction by Peterson et al. (2009), who synthesized the same compound using a hydrothermal method. The phase boundary between rhomboclase and (H3O)Fe(SO 4)2 as a function of temperature (T) and relative humidity (RH) was determined by environment-controlled in situ X-ray diffraction (XRD) method. The stability of (H3O)Fe(SO4)2 against rhomboclase was further evaluated under a simulated martian condition (constant 50\% RH, -20 °C, 6 mbar CO2). Both phases remained after 14 days with no observable transition. This result suggests that hydrate ferric sulfate minerals might not respond to diurnal RH fluctuation under the extremely slowed kinetics expected on the martian surface.",

keywords = "Ferric sulfate, Humidity, Hydrate, Mars, Rhomboclase, Sulfate",

author = "Wenqian Xu and Parise, \{John B.\} and Jonathan Hanson",

year = "2010",

month = oct,

doi = "10.2138/am.2010.3470",

language = "English",

volume = "95",

pages = "1408--1412",

journal = "American Mineralogist",

issn = "0003-004X",

number = "10",

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TY - JOUR

T1 - (H3O)Fe(SO4)2 formed by dehydrating rhomboclase and its potential existence on Mars

AU - Xu, Wenqian

AU - Parise, John B.

AU - Hanson, Jonathan

PY - 2010/10

Y1 - 2010/10

N2 - Rhomboclase, (H5O2)Fe(SO4) 2·2H2O, transforms to a solid crystalline phase, (H3O)Fe(SO4)2, upon dehydration. The structure of (H3O)Fe(SO4)2 is found to be the same as a recently reported structure determined from single-crystal diffraction by Peterson et al. (2009), who synthesized the same compound using a hydrothermal method. The phase boundary between rhomboclase and (H3O)Fe(SO 4)2 as a function of temperature (T) and relative humidity (RH) was determined by environment-controlled in situ X-ray diffraction (XRD) method. The stability of (H3O)Fe(SO4)2 against rhomboclase was further evaluated under a simulated martian condition (constant 50% RH, -20 °C, 6 mbar CO2). Both phases remained after 14 days with no observable transition. This result suggests that hydrate ferric sulfate minerals might not respond to diurnal RH fluctuation under the extremely slowed kinetics expected on the martian surface.

AB - Rhomboclase, (H5O2)Fe(SO4) 2·2H2O, transforms to a solid crystalline phase, (H3O)Fe(SO4)2, upon dehydration. The structure of (H3O)Fe(SO4)2 is found to be the same as a recently reported structure determined from single-crystal diffraction by Peterson et al. (2009), who synthesized the same compound using a hydrothermal method. The phase boundary between rhomboclase and (H3O)Fe(SO 4)2 as a function of temperature (T) and relative humidity (RH) was determined by environment-controlled in situ X-ray diffraction (XRD) method. The stability of (H3O)Fe(SO4)2 against rhomboclase was further evaluated under a simulated martian condition (constant 50% RH, -20 °C, 6 mbar CO2). Both phases remained after 14 days with no observable transition. This result suggests that hydrate ferric sulfate minerals might not respond to diurnal RH fluctuation under the extremely slowed kinetics expected on the martian surface.

KW - Ferric sulfate

KW - Humidity

KW - Hydrate

KW - Mars

KW - Rhomboclase

KW - Sulfate

UR - https://www.scopus.com/pages/publications/77957599909

U2 - 10.2138/am.2010.3470

DO - 10.2138/am.2010.3470

M3 - Article

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SN - 0003-004X

VL - 95

SP - 1408

EP - 1412

JO - American Mineralogist

JF - American Mineralogist

IS - 10

ER -

(H₃O)Fe(SO₄)₂ formed by dehydrating rhomboclase and its potential existence on Mars

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Keywords

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