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  • 1
    Electronic Resource
    Electronic Resource
    Critical behavior of the surface of FeBO3 single crystals (2000)
    Springer
    JETP letters 71 (2000), S. 442-445 
    Details
    ISSN: 1090-6487
    Keywords: 75.30.Kz ; 75.40.−s ; 68.35.Rh
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The behavior of the surface and near-surface layers of macroscopic FeBO3 single crystals is studied over the temperature range from 291 K to Neél temperature (T N ) using depth-selective conversion-electron Mössbauer spectroscopy. Three different phases or states, namely, an antiferromagnetically ordered phase (similar to the crystal bulk state), a surface phase, and a transition layer between them coexist near the Neél point in a surface layer ∼500 nm thick. The critical parameters found for the bulk phase agree well with the theoretical critical index νth≅0.63 predicted by the 3D Ising model. As the crystal surface is approached, the critical parameter β increases to 0.51(2) but remains smaller than the value of β=0.8 for the surface of a semi-infinite Heisenberg model. Therefore, the effective dimensionality of the system, being equal to 3 in the bulk, decreases at the crystal surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568373
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    Paper (German National Licenses)
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  • 2
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    Identification of Phyllosilicates in Mudstone Samples Using Water Releases Detected by the Sample Analysis at Mars (SAM) Instrument in Gale Crater, Mars (2017)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Sample Analysis at Mars (SAM) instrument on board the Curiosity Rover has detected high temperature water releases from mud-stones in the areas of Yellowknife Bay, Pahrump Hills, Naukluft Plateau, and Murray Buttes in Gale crater. Dehydroxylation of phyllosilicates may have caused the high temperature water releases observed in these samples. Because each type of phyllosilicate undergoes dehydroxylation at distinct temperatures, these water releases can be used to help constrain the type of phyllosilicate present in each sample.
    Keywords: Lunar and Planetary Science and Exploration; Inorganic, Organic and Physical Chemistry
    Type: JSC-CN-38633 , Lunar and Planetary Science Conference; Mar 20, 2017 - Mar 24, 2017; The Woodlands, TX; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Oxychlorine Detections on Mars: Implications for Cl Cycling (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-19
    Description: The Sample Analysis at Mars (SAM) instrument has detected evolved O2 and HCl indicating the presence of perchlorate and/or chlorate (oxychlorine) in all 11 sediments analyzed to date. The hyperarid martian climate is believed to have allowed accumulation of oxychlorine and assumed chloride contents similar to those in hyperarid terrestrial settings. The linear correlation of oxychlorine and chloride of Gale Crater sediments is low (r (sup 2) equals 0.64). Correlations present in hyperarid Antarctica and the Atacama Desert are attributed to unaltered atmospheric source coupled with minimal redox cycling by biological activity. Terrestrial semi-arid to arid settings have low correlations similar to Gale Crater and are attributed to additional inputs of Cl minus from sea salt, dust, and/or proximal playa settings, and possible reduction of oxychlorine phases during wetter periods. While microbiological processes could contribute to low oxychlorine/chloride correlations on Mars, several abiotic mechanisms are more likely, such as changing oxychlorine production rates with time and/or post-depositional geochemical redox processes that altered the Gale Crater oxychlorine and chloride contents.
    Keywords: Lunar and Planetary Science and Exploration; Inorganic, Organic and Physical Chemistry
    Type: JSC-CN-36301 , Goldschmidt Conference (Goldschmidt 2016); Jun 26, 2016 - Jul 01, 2016; Yokohama; Japan
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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