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Electrical properties of lunar soil sample 15301,38Electrical property measurements have been made on an Apollo 15 lunar soil sample in ultrahigh vacuum from room temperature to 827 C for the frequency spectrum from 100 Hz through 1 MHz. The dielectric constant, the total ac loss tangent, and the dc conductivity were measured. The dc conductivity showed no thermal hysteresis, but an irreversible (in vacuum) thermal effect was found in the dielectric loss tangent on heating above 700 C and during the subsequent cooling. This appears to be related to several effects associated with lunar glass above 700 C. The sample also showed characteristic low-frequency dispersion in the dielectric constant with increasing temperature, presumably due to Maxwell-Wagner intergranular effects. The dielectric properties may be fitted to a model involving a Cole-Cole frequency distribution that is relatively temperature-independent below 200 C and follows a Boltzmann temperature distribution with an activation energy of 2.5 eV above 200 C. The dc conductivity is fitted by an exponential temperature distribution and becomes the dominant loss above 700 C.
Document ID
19740045116
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Olhoeft, G. R.
(Lockheed Electronics Co., Inc. Houston, Tex., United States)
Frisillo, A. L.
Strangway, D. W.
(NASA Johnson Space Center Houston, Tex., United States)
Date Acquired
August 7, 2013
Publication Date
April 10, 1974
Publication Information
Publication: Journal of Geophysical Research
Volume: 79
Subject Category
Space Sciences
Accession Number
74A27866
Distribution Limits
Public
Copyright
Other

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