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New Nickel Vapor Pressure Measurements: Possible Implications for Nebular CondensatesTemperatures high enough to vaporize even refractory solids existed in the midplane of the solar nebula during its earliest evolutionary stages and played an important role in the processing of materials that went into the formation of the inner planets and asteroids. A variety of such high-T materials have been identified in primitive chondritic meteorites. These include chemically zoned FeNi metal grains that are generally believed to have formed directly by gas-solid condensation from a gas of approximately solar composition. These FeNi particles provide important information about the times scales of formation and physical transport mechanisms in the nebula, as well as formation temperature, pressure and gas chemistry. Currently, however, the interpretation of the chemical signatures in these FeNi particles rests on less than perfect information about the condensation sequence of siderophile elements. For example much, if not all, of the thermodynamic data for the vapor pressures of moderately refractory metals , such as Fe, Ni and Co, do not cover the desired temperature range. As a result, quite large extrapolations are needed. These extrapolations can be complex and uncertain due to factors such as oxygen fugacity or the presence of hydrogen gas.
Document ID
20050165568
Acquisition Source
Headquarters
Document Type
Conference Paper
Authors
Johnson, N. M.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Meibom, A.
(Stanford Univ. Stanford, CA, United States)
Ferguson, F. T.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Nuth, J. A., III
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2004
Publication Information
Publication: Chondrites and the Protoplanetary Disk, Part 2
Subject Category
Lunar And Planetary Science And Exploration
Distribution Limits
Public
Copyright
Public Use Permitted.
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