THE TRAPPING OF ELECTRONS AND HOLES IN MIXED CRYSTALS. Technical Report 171
Technical Report
·
OSTI ID:4760203
Electrons and holes were produced in mixed crystals of kCl-KBr and KCl- RbCl solid solution systems by irradiation with 3-Mev electrons at --190, --80, and 20 deg C with doses 10/sup 5/s to 10/sup 6/ rads. The optical absorption resulting from the trapping of electrons and holes was measured at --190 deg C to reduce bleaching. The mixed crystals of KCl-KBr and KCl-RbCl irradiated at liquid-nitrogen temperature contained F, F', K, and V/sub 1/ centers. The F and K centers appeared at --80 deg C while at 20 deg C irradiations the F, k, and M bands were observed. Some other bands were also observed but not studied. The Mollwo relation lambda = const. d/sup n/) is not valid for the shift of the maximum of all bands observed, possibly because of lattice distortion. The center frequency of the F' band shifted with composition opposite to the F-band deviation. In pure crystals the center frequency of the F' band was found to be lower than previously observed. The half-width of the F band is greater in mixed crystals -its maximum approximately corresponding to the microhardness maximum and the maximum deviation from iinear of the exciton band-edge shift. The V/sub 1/ band half-width in the KCl-RbCl system decreases contrary to that in KCl-KBr. Intensity of the F band-versus -compositlon curves for KCl-KBr exhibit both a relative maximum and minimum, but in KCl-RbCl only a deep minimum. In no case did a mixed crystal color more than pure KBr, contrary to what might be expected from the large distortions present. Curves for the F' and V/sub 1/ bands follow the general pattern of those of the F band but with reduced intensity. (auth)
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge. Lab. for Insulation Research
- NSA Number:
- NSA-17-003481
- OSTI ID:
- 4760203
- Report Number(s):
- NP-12198
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ABSORPTION
COLOR
CRYSTALS
DEFECTS
DIAGRAMS
ELECTRON BEAMS
EXCITATION
FREQUENCY
HARDNESS
IMPURITIES
IRRADIATION
LATTICES
LOW TEMPERATURE
MEASURED VALUES
METALS, CERAMICS, AND OTHER MATERIALS
MIXING
PHASE DIAGRAMS
POTASSIUM BROMIDES
POTASSIUM CHLORIDES
RUBIDIUM CHLORIDES
SOLID SOLUTIONS
SPECTRAL SHIFT
TEMPERATURE
COLOR
CRYSTALS
DEFECTS
DIAGRAMS
ELECTRON BEAMS
EXCITATION
FREQUENCY
HARDNESS
IMPURITIES
IRRADIATION
LATTICES
LOW TEMPERATURE
MEASURED VALUES
METALS, CERAMICS, AND OTHER MATERIALS
MIXING
PHASE DIAGRAMS
POTASSIUM BROMIDES
POTASSIUM CHLORIDES
RUBIDIUM CHLORIDES
SOLID SOLUTIONS
SPECTRAL SHIFT
TEMPERATURE