Physics
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986icar...66..211r&link_type=abstract
Icarus (ISSN 0019-1035), vol. 66, May 1986, p. 211-222.
Physics
46
Electron Microscopy, Infrared Spectroscopy, Magnesium, Microstructure, Silicon Oxides, Smoke, Amorphous Materials, Annealing, Crystal Structure, Crystallinity, Interstellar Matter, Mineralogy, Stellar Envelopes, X Ray Diffraction
Scientific paper
Analytical 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.
MacKinnon Ian D. R.
Nuth Joseph A.
Rietmeijer Frans J. M.
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