Mechanism of relaxation polarization in lithium fluoride single crystals
The authors have compared the thermally stimulated currents and the pulsed electromagnetic radiation of thermoelectrets and mechanoelectrets made from lithium fluoride single crystals grown without specially introduced impurities. The samples with platinum electrodes applied to the surface by cathodic sputtering were deformed along the largest face up to relative strain /var epsilon/ equal to 1.4%. Then the thermally stimulated currents were registered upon heating the samples at the rate of 3-4 deg/min. In other experiments, after deformation of the samples under analogous conditions they registered the pulsed electromagnetic signals for the samples upon nonisothermal annealing. Plane-parallel samples were polarized at the temperature 473 K and electric field intensity 5 kV/cm for 10-15 min. Since thermally stimulated currents and pulsed electromagnetic signals at 363-383 K decreased substantially over the course of several hours after polarization or deformation of the samples and were practically unregistered after one day, while the volume charge in LiF can be retained over the course of many months, they may conclude that the first relaxation maximum is not connected with disruption of the volume charge. It is possible due to localization of cationic vacancies on individual dislocations, while the second maximum may be due to such dislocation pile-ups.
- Research Organization:
- S.M. Kirov Tomsk Polytechnic Institute (USSR)
- OSTI ID:
- 5951543
- Journal Information:
- Inorg. Mater. (Engl. Transl.); (United States), Vol. 24:7; Other Information: Translated from Izv. Akad. Nauk. SSSR, Neorg. Mater.; 24: No. 7, 1227-1228 (Jul 1988)
- Country of Publication:
- United States
- Language:
- English
Similar Records
Application of isothermal calorimetry and uv spectroscopy for stability monitoring of pentaerythritol tetranitrate
Stability of heterocharges in poly(methyl methacrylate) thermoelectrets. II. Effect of. gamma. -irradiation on thermally stimulated current spectra
Related Subjects
ELECTRETS
THERMOELECTRIC PROPERTIES
LITHIUM FLUORIDES
POLARIZATION
ANNEALING
CARRIER MOBILITY
DEFORMATION
DISLOCATIONS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRIC FIELDS
ELECTROMAGNETIC PULSES
MONOCRYSTALS
RELAXATION
TEMPERATURE EFFECTS
VACANCIES
ALKALI METAL COMPOUNDS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
CURRENTS
DIELECTRIC MATERIALS
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HEAT TREATMENTS
LINE DEFECTS
LITHIUM COMPOUNDS
LITHIUM HALIDES
MATERIALS
MOBILITY
PHYSICAL PROPERTIES
POINT DEFECTS
PULSES
RADIATIONS
360603* - Materials- Properties
360602 - Other Materials- Structure & Phase Studies