Dielectric behavior of MgO:Li/sup +/ crystals

Technical Report · Tue Jan 01 00:00:00 EST 1980

OSTI ID:5810523

Puma, M; Lorincz, A; Andrews, J F; Crawford, Jr, J H

Measurements of the dielectric constant in crystals of MgO doped with Li/sup +/ ions have been carried out after quenching from anneals at 1300/sup 0/C in static air. Prior to heat treatment the crystals showed no discernible dielectric loss but afterwards the loss tangent exceeded 0.4. For 10 min anneals the dielectric relaxation is very close to a Debye process and the temperature dependence of the maximum of the loss peak corresponds to an activation energy of 0.72 eV. When plotted in the form of a Cole-Cole arc the data indicate that deviation from a Debye relaxation amounts to a distribution of relaxation time no greater than that which can be accounted for with a distribution of activation energies only 0.007 eV. For longer heating times overlapping relaxation processes appear. The lack of broadening of the loss peak and the magnitude of the relaxation time yield clues as to possible loss mechanisms.

• Research Organization: North Carolina Univ., Chapel Hill (USA). Dept. of Physics and Astronomy
• DOE Contract Number: AS05-78ER05866
• OSTI ID: 5810523
• Report Number(s): DOE/ER/05866-18; ON: DE82004620; TRN: 82-004940
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
MAGNESIUM OXIDES
DIELECTRIC PROPERTIES
DOPED MATERIALS
HEAT TREATMENTS
LITHIUM IONS
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
CHARGED PARTICLES
ELECTRICAL PROPERTIES
IONS
MAGNESIUM COMPOUNDS
MATERIALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
360203* - Ceramics
Cermets
& Refractories- Mechanical Properties