RADIATION EQUILIBRIUM OF F AND M CENTERS IN KCl

Journal Article · Fri Feb 15 04:00:00 EST 1963 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.129.1578· OSTI ID:4725963

Sonder, E; Sibley, W A

A study of F- and M-center coloration by electronirradiatirg single crystals of KCl is made as a function of radiation intensity, electron energy, and crystal preparation. The quadratic relation between M-center and Fcenter concentration in any particular sample, previously observed for both x-ray and gamma irradiation, is verified for electrons if a constant current is used throughout the irradiation. However, the ratio of M-center concentration to the square of the F-center concentration is dependent upon electron current and sample preparation. Moreover, if a specimen is irradiated at one radiation intensity for a long period and then the intensity is changed for a short time, the relative M- and F-center concentrations are characteristic of the last irradiation intensity. It is concluded from this result that a dynamic equilibrium exists between F centers and M centers during irradiation. Interpretation of the results is proposed in terms of four simultaneous processes producing and destroying F centers and M centers, respectively. The processes for destruction of F certers and creation of M certers are thought to involve a mobile imperfection created by the irradiation. Means by which small concentrations of impurities can affect some of these processes to change the F-M equilibrium and F-center coloring curves are discussed. (auth)

• Research Organization: Oak Ridge National Lab., Tenn.
• NSA Number: NSA-17-011393
• OSTI ID: 4725963
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 129; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

COLOR
CURRENTS
DEFECTS
ELECTRONS
ENERGY
F CENTERS
GAMMA RADIATION
IMPURITIES
IRRADIATION
LATTICES
M CENTERS
MONOCRYSTALS
PHYSICS
POTASSIUM CHLORIDES
PREPARATION
RADIATIONS
TRACE AMOUNTS
VACANCIES
X RADIATION