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VOLUME EXPANSION AND COLOR CENTER BEHAVIOR OF NaCl X-RAY IRRADIATED AT LOW TEMPERATURE

Journal Article · · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
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Volume expansion of x irradiated NaCl was measured in the range 15-90 deg K and its optical behavior was analyzed from 15 to 300 deg K. An improved photoelastic method showed that strain profiles agree with the shape predicted by the linear theory and that slow cooling (10 deg C per h) is essential to minimize background strain. Twenty-four hours of irradiation by 45 kv, 30 ma x rays at 15 deg K produces DELTA V/V of the order of 10/sup -5/ which does not anneal below 80 deg K while, tage annealing. Growth curves of the F band and of the 343-m mu band were made at 15 deg K. Annealing at 80 deg K followed by reirradiation at 15 deg K indicates that these bands recover KCl and KBr suggests that the F centers are annihilated by hole capture. It follows also that in the range 15 to 80 deg K electronic changes in these centers do not lead to volume changes greater than the experimental error, DELTA V/V approx equal 10/sup -6/. Heattreated crystals presented a different behavior of thermal annealing of the F band with several annealing stages between 15 and 80 deg K. (auth)
Research Organization:
Univ. of Sao Paulo, Brazil
NSA Number:
NSA-18-016106
OSTI ID:
4067639
Journal Information:
Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 134; ISSN PHRVA
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

CHEMISTRY
COLLISIONS
ELASTICITY
EQUATIONS
GASES
INTERACTIONS
IONIZATION
LORENTZ GAS
MATHEMATICS
PARTICLES