Effect of frequency and temperature on rock dielectric properties
The real and imaginary components of dielectric constant were determined for basalt, granite and quartzite in the frequency range 10 MHz to 4 GHz. The variation of dielectric permittivity with temperature was determined from room temperature to 450/sup 0/C. No dielectric dispersion or rock relaxation was observed in the frequency range investigated. Hence, the rock relative dielectric constant and relative loss showed mild variation with frequency with no discontinuity or sharp peaks as those previously observed in the low frequency range (up to 2 KHz). The temperature coefficient of the relative dielectric constant was related to the isobarric thermal expansion coefficient of the rock. The relative dielectric loss of basalt and granite followed an Arrhenius exponential increase with temperature suggesting the loss mechanism to be associated with activated particulate diffusion in the rock lattice. Activation energy for the conductance process depended on the temperature range and appeared to be independent of frequency. Quartzite showed an anomalous temperature variation of its conductivity.
- Research Organization:
- Honeywell, Inc., Minneapolis, MN (USA)
- OSTI ID:
- 6513262
- Report Number(s):
- AD-766-050/9
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
580300* -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
BASALT
DIELECTRIC PROPERTIES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EXPANSION
FREQUENCY DEPENDENCE
FREQUENCY RANGE
GRANITES
HIGH TEMPERATURE
IGNEOUS ROCKS
MEDIUM TEMPERATURE
METAMORPHIC ROCKS
PERMITTIVITY
PHYSICAL PROPERTIES
PLUTONIC ROCKS
QUARTZITES
ROCKS
TEMPERATURE DEPENDENCE
THERMAL EXPANSION
VOLCANIC ROCKS