DIELECTRIC CONSTANT AND LOSS MEASUREMENTS ON HIGH-TEMPERATURE MATERIALS. Technical Report 182
Technical Report
·
OSTI ID:4140106
Measurement techniques for the frequency range 10/sup 2/ to about 2.5 x 10/sup 10/ are discussed for temperatures to 1650 deg C. These include the use of bridges, resonant circuits, standing-wave methods, and resonant cavities. Data on crystals of Al/sub 2/O/sub 3/, Cr/sub 2/O/sub 3/, MgO, LaAlO/sub 3/, Y/sub 2/O/ sub 3/; on multicrystalline bodies of Al/sub 2/O/sub 3/, BeO, MgO, Mg/sub 2/SlO/ sub 4/, Ta/sub 2/O/sub 5/, T hO; on glass ceramics, silica glass, and BN are presented over smaller temperature and frequency ranges. Pyrolitic BN has a low loss tangent (0.0004 at 1375 deg C, 4.8 x 10/sup 9/cps) and a low temperature coefficient of dielectric constant. Some aluminas and silicas exhibit loss tangents of ca. 0.0006 at 1000 deg C in the microwave region. Microwave losses are due partly to the charge transfer responsible for lowfrequency conductivity and to the vibration spectra of infrared absorption. Both losses are increased by the addition of impurities. (auth)
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge. Lab. for Insulation Research
- NSA Number:
- NSA-18-007214
- OSTI ID:
- 4140106
- Report Number(s):
- NP-13431
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ABSORPTION
ALUMINUM OXIDES
CAVITY RESONATORS
CERAMICS
CHROMIUM OXIDES
CIRCUITS
CRYSTALS
DIELECTRICS
ELECTRIC CONDUCTIVITY
FREQUENCY
GLASS
HIGH TEMPERATURE
IMPURITIES
INFRARED RADIATION
LANTHANUM OXIDES
LOSSES
MAGNESIUM OXIDES
MAGNESIUM SILICATES
MEASURED VALUES
METALS, CERAMICS, AND OTHER MATERIALS
MICROWAVES
PYROLYSIS
RESONANCE
SILICON OXIDES
SPECTRA
TANTALUM OXIDES
THORIUM OXIDES
VIBRATIONS
YTTRIUM OXIDES
ALUMINUM OXIDES
CAVITY RESONATORS
CERAMICS
CHROMIUM OXIDES
CIRCUITS
CRYSTALS
DIELECTRICS
ELECTRIC CONDUCTIVITY
FREQUENCY
GLASS
HIGH TEMPERATURE
IMPURITIES
INFRARED RADIATION
LANTHANUM OXIDES
LOSSES
MAGNESIUM OXIDES
MAGNESIUM SILICATES
MEASURED VALUES
METALS, CERAMICS, AND OTHER MATERIALS
MICROWAVES
PYROLYSIS
RESONANCE
SILICON OXIDES
SPECTRA
TANTALUM OXIDES
THORIUM OXIDES
VIBRATIONS
YTTRIUM OXIDES