Growth of color centers and hardening of CaF$sub 2$ by heavy dose of $gamma$-irradiation

Journal Article · Tue Oct 16 04:00:00 EDT 1973 · Phys. Status Solidi (a), v. 19, no. 2, pp. 625-634

DOI:https://doi.org/10.1002/pssa.2210190228· OSTI ID:4384774

Sashital, S R; Vedam, K

The growth of color centers and the accompanying changes in the mechanical properties (flow stress, Vicker's microhardness, and dislocation mobilities) of CaF/sub 2/ single crystals due to x-ray irradiation were studied in the dosage range of 10/sup 4/ to 5 x 10/sup 8/ R at room temperature. Of the four absorption band spectra with peaks at 225, 335, 400, and 580 nm observed, the 225, 400. and 580 nm bands were seen to saturate at about 10/sup 5/ R and remain saturated in the entire dosage range studied. On the other hand the 335- nm band, after initial saturation at approximately 10/sup 5/ R, was observed to start giowing again at about 2 x 10/sup 7/ R. The observed changes in the mechanical properties are seen to correlate well with the growth of the 335-nm band. A tentative model is suggested for the color center responsible for the 335-nm band and the mechanical-property changes. (auth)

• Research Organization: Pennsylvania State Univ., University Park
• Sponsoring Organization: USDOE
• NSA Number: NSA-29-005577
• OSTI ID: 4384774
• Journal Information: Phys. Status Solidi (a), v. 19, no. 2, pp. 625-634, Journal Name: Phys. Status Solidi (a), v. 19, no. 2, pp. 625-634; ISSN PSSAB
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

*CALCIUM FLUORIDES-- PHYSICAL RADIATION EFFECTS
ABSORPTION SPECTRA
COLOR CENTERS
FLOW STRESS
GAMMA RADIATION
MEDIUM TEMPERATURE
MONOCRYSTALS
N50330* --Metals
Ceramics
& Other Materials--Plastics & Other Materials--Properties
Structure & Phase Studies
RADIATION DOSES
ULTRAVIOLET SPECTRA
VICKERS HARDNESS