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  • 1
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    Quartz microbalance studies of an adsorbed helium film. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The resonant frequency of a quartz crystal oscillating in the thickness-shear mode changes by virtue of the mass loading due to any type of film laid down on its surfaces. For a helium film only the normal fraction remains rigidly coupled to the substrate motion. Adsorption isotherms of He-4 measured with this technique show clear departures from conventional nonsuperfluid behavior. We attribute this effect to the onset and presence of superfluidity in the film.
    Keywords: PHYSICS, SOLID-STATE
    Type: Physical Review Letters; 29; July 24
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Some investigations of refractory metal systems of thermionic interest (1969)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Diffusion rates in refractory metal alloys for thermionic emitters as function of time and temperature
    Keywords: PHYSICS, SOLID-STATE
    Type: GA-9495 , INST. OF ELECTRICAL AND ELECTRONICS ENGINEERS, THERMIONIC ENERGY CONVERSION SPECIALIST CONFERENCE; Oct 21, 1969 - Oct 23, 1969; CARMEL, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Chemical vapor-deposition of tungsten emitters of /110/ preferred crystal orientation. (1968)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Preferred crystal orientations and vacuum work functions of planar tungsten deposits formed by hydrogen reduction of tungsten chloride
    Keywords: PHYSICS, SOLID-STATE
    Type: GA-8389 , INTERNATIONAL CONFERENCE ON THERMIONIC ELECTRICAL POWER GENERATION; May 27, 1968 - May 31, 1968; STRESA; ITALY
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Development of chemically vapor deposited rhenium emitters of (0001) preferred crystal orientation (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Rhenium thermionic emitters were prepared by the pyrolysis of rhenium chlorides formed by the chlorination of rhenium pellets. The impurity contents, microstructures, degrees of (0001) preferred crystal orientation, and vacuum electron work functions of these emitters were determined as a function of deposition parameters, such as substrate temperature, rhenium pellet temperature and chlorine flow rate. A correlation between vacuum electron work function and degree of (0001) preferred crystal orientation was established. Conditions for depositing porosity-free rhenium emitters of high vacuum electron work functions were defined. Finally, three cylindrical rhenium emitters were prepared under the optimum deposition conditions.
    Keywords: PHYSICS, SOLID-STATE
    Type: NASA-CR-121143 , GULF-GA-A-12506
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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