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  • 1985-1989  (2)
  • 1986  (2)
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  • 1985-1989  (2)
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  • 1
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    The ammonia-water phase diagram and its implications for icy satellites (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A Holzapfel-type diamond anvil cell is used to determine the NH3 - H2O phase diagram in the region from 0 to 33 mole percent NH3, 240 to 370 K, and 0 to 5 GPa. The following phases were identified: liquid; water ices Ih, III, V, VI, VII, and VIII; ammonia monohydrate, NH3.H2O; and ammonia dihydrate NH3.2H2O. Ammonia dihydrate becomes prominent at moderate pressures (less than 1 GPa), with planetologically significant implications, including the possibility of layering in Titan's magma ocean.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-179881 , NAS 1.26:179881
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Resistance heating of Fe and W in diamond-anvil cells (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A new method for internally heating a diamond-anvil cell is described. Fine wires of iron or tungsten are resistively heated in a gasketed cell, thus providing a uniformly distributed pressure that can be measured in situ by employing the ruby scale. Temperatures of several thousand degrees have been measured by fitting a black body radiation function to the spectrum of the hot wire taken with an optical multichannel analyzer. Temperatures as high as the melting temperature of tungsten have been achieved. The alpha-gamma and alpha-epsilon phase transitions of iron have been studied, and the results show excellent agreement with previous data obtained with piston-cylinder or externally-heated diamond cells.
    Keywords: METALLIC MATERIALS
    Type: Physica B (ISSN 0378-4363); 139-140B; 916-918
    Format: text
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    NASA TECHNICAL REPORTS
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