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analytical electron microscopy of mg-sio smokes - a comparison with infrared and xrd studiesAnalytical electron microscopy conducted for Mg-SiO smokes (experimentally obtained from samples previously characterized by IR spectroscopy) indicates that the microcrystallinity content of unannealed smokes increases with increased annealing for up to 30 hr. The growth of forsterite microcrystallites in the initially nonstoichiometric smokes may give rise to the contemporaneous growth of the SiO polymorph tridymite and MgO; after 4 hr of annealing, these react to form enstatite. It is suggested that XRD analysis and IR spectroscopy should be conducted in conjunction with detailed analytical electron microscopy for the detection of emerging crystallinity in vapor-phase condensates.
Document ID
19860061139
Document Type
Reprint (Version printed in journal)
Authors
Rietmeijer, F. J. M.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Nuth, J. A.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Mackinnon, I. D. R.
(NASA Johnson Space Center Houston, TX; NASA, Washington, DC, United States)
Date Acquired
August 12, 2013
Publication Date
May 1, 1986
Publication Information
Publication: Icarus
Volume: 66
ISSN: 0019-1035
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAS9-17005
CONTRACT_GRANT: NAS9-17391
Distribution Limits
Public
Copyright
Other