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Comparison of volatiles evolving from selected highland and mare lunar regolith simulants during vacuum sintering

Journal Article · · Planetary and Space Science
 [1];  [2];  [3];  [4];  [5];  [5]
  1. SuprAEther, LLC, La Crescenta, CA (United States)
  2. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
  3. California Institute of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab. (JPL)
  4. Jacobs Engineering, Inc., Huntsville, AL (United States)
  5. NASA Marshall Space Flight Center (MSFC), Huntsville, AL (United States)
Volatiles evolving from JSC-1A, NU-LHT-4M and CSM-LHT-1G lunar regolith simulants during in vacuo thermal processing were analyzed using mass spectrometry as a function of temperature. Two high-fidelity simulants, JSC-1A (mare) and NU-LHT-4M (highland), were compared to a newly developed CSM-LHT-1G highland simulant, modified to closely match lunar geochemistry. Large autogenous gas loads were observed for all investigated materials. Mineralogical knowledge was used to identify and attribute individual volatile species to reacting, transforming, or decomposing constituents (hydrates, carbonates, sulfates, sulfides, clays, etc.) of the respective regolith simulant in the self-generated gas environment. Cumulative mass losses for individual simulant components as a function of temperature were quantified using mass spectrometry in conjunction with thermogravimetric analysis. Investigation of the four components of CSM-LHT-1G – anorthosite, basalt, augite, and glass – aided the attribution of volatile species to specific compounds and their respective sources. The results showed significant decomposition of non-lunar phases present in the man-made regolith simulants below the typical glass crystallization temperatures, which paves the way to devising methods for enhancing the fidelity of the simulants. Finally, high gas loads and corrosive gases (HF and HCl) were recognized as potential hazards, pertaining to the development of large testbed facilities.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
2467386
Report Number(s):
LA-UR--24-22621
Journal Information:
Planetary and Space Science, Journal Name: Planetary and Space Science Vol. 252; ISSN 0032-0633
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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