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High pressure cosmochemistry applied to major planetary interiors: Experimental studiesProgress is reported on a project to determine the properties and boundaries of high pressure phases of the H2-He-H2O-NH3-CH4 system that are needed to constrain theoretical models of the interiors of the major planets. This project is one of the first attempts to measure phase equilibria in binary fluid-solid systems in diamond anvil cells. Vibrational spectroscopy, direct visual observations, and X-ray diffraction crystallography of materials confined in externally heated cells are the primary experimental probes. Adiabats of these materials are also measured in order to constrain models of heat flow in these bodies and to detect phase transitions by thermal anomalies. Initial efforts involve the NH3-H2O binary. This system is especially relevant to models for surface reconstruction of the icy satellites of Jupiter and Saturn. Thermal analysis experiments were completed for the P-X space, p4GPa:0 or = 0.50, near room temperature. The cryostat, sample handling equipment, and optics needed to extend the optical P-T-X work below room temperature was completed.
Document ID
19850003650
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Nicol, M. F. (California Univ. Los Angeles, CA, United States)
Johnson, M. (California Univ. Los Angeles, CA, United States)
Koumvakalis, A. S. (California Univ. Los Angeles, CA, United States)
Date Acquired
September 5, 2013
Publication Date
November 1, 1984
Subject Category
Lunar And Planetary Exploration
Report/Patent Number
NASA-CR-174032
NAS 1.26:174032
Accession Number
85N11958
Funding Number(s)
CONTRACT_GRANT: NAGW-104
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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