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Indium Tin Oxide-Magnesium Fluoride Co-Deposited Films for Spacecraft ApplicationsHighly transparent coatings with a maximum sheet resistivity between 10(exp 8) and 10(exp 9) ohms/square are desired to prevent charging of solar arrays for low Earth polar orbit and geosynchronous orbit missions. Indium tin oxide (ITO) and magnesium fluoride (MgF2) were ion beam sputter co-deposited onto fused silica substrates and were evaluated for transmittance, sheet resistivity and the effects of simulated space environments including atomic oxygen (AO) and vacuum ultraviolet (VUV) radiation. Optical properties and sheet resistivity as a function of MgF2 content in the films will be presented. Films containing 8.4 wt.% MgF2 were found to be highly transparent and provided sheet resistivity in the required range. These films maintained a high transmittance upon exposure to AO and to VUV radiation, although exposure to AO in the presence of charged species and intense electromagnetic radiation caused significant degradation in film transmittance. Sheet resistivity of the as-fabricated films increased with time in ambient conditions. Vacuum beat treatment following film deposition caused a reduction in sheet resistivity. However, following vacuum heat treatment, sheet resistivity values remained stable during storage in ambient conditions.
Document ID
19980235566
Document Type
Reprint (Version printed in journal)
Authors
Dever, Joycer A. (NASA Lewis Research Center Cleveland, OH United States)
Rutledge, Sharon K. (NASA Lewis Research Center Cleveland, OH United States)
Hambourger, Paul D. (Cleveland State Univ. Cleveland, OH United States)
Bruckner, Eric (Cleveland State Univ. Cleveland, OH United States)
Ferrante, Rhea (Cleveland State Univ. Cleveland, OH United States)
Pal, Anna Marie (Cleveland State Univ. Cleveland, OH United States)
Mayer, Karen (Cleveland State Univ. Cleveland, OH United States)
Pietromica, Anthony J. (Ohio Aerospace Inst. Brook Park, OH United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1998
Subject Category
Nonmetallic Materials
Report/Patent Number
NASA/TM-1998-208499
NAS 1.15:208499
E-11297
Meeting Information
Metallurgical Coatings and Thin Films(San Diego, CA)
Funding Number(s)
PROJECT: RTOP 632-1A-1E
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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