VOLUME EXPANSION AND COLORATION IN X-IRRADIATED SODIUM CHLORIDE

Journal Article · Sun Mar 01 04:00:00 EST 1964 · Phys. Chem. Solids

DOI:https://doi.org/10.1016/0022-3697(64)90107-6· OSTI ID:4012308

Merriam, M F; Wiegand, D A; Smoluchowski, R

The growth and thermal annealing of the volume expansion produced in NaCl by prolonged exposure to penetrating x rays at room temperature was studied by a photoelastic technique. Growth and annealing of the visible optical absorption bands were also measured. The growth curves for volume expansion and coloration are mutually consistent, within experimental error and theoretical uncertainties. The latter are, however, too large to permit unambiguous determination of the types of defects generated by irradiation. The F-center growth curve is of the type reported for KCl, that is, it contains an inflection point. The M- and F-band absorption constants are quadratically related in a manner consistent with previous evidence for the double F-model of the M-center. Anneaiing of the volume expansion and the opticat absorption is in general agreement with the earlier results on NaCl bombarded with high energy protons but better resolution was obtained. The annealing is highly structure sensitive and details of the annealing curves were not completely reproducible. Kinetic analyses indicate that the annealing of volume expansion is limited initially (200-250 deg C) by diffusion of negative ion vacancies or by close pair vacancy- interstitial recombination. An interesting after effect in the annealing of the volume expansion may be connected with radiation enhanced impurity precipitation. Profiles of the photoelastically measured strain as a function of distance from the crystal midplane were obtained experimentally and compared with those calculated from the one dimensional theory. (auth)

• Research Organization: Univ. of California, San Diego, La Jolla
• NSA Number: NSA-18-020598
• OSTI ID: 4012308
• Journal Information: Phys. Chem. Solids, Journal Name: Phys. Chem. Solids Vol. Vol: 25
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
ANIONS
ANNEALING
COLOR
CRYSTALS
DEFECTS
DIAGRAMS
DIFFUSION
ENERGY
ERRORS
EXPANSION
IMPURITIES
IRRADIATION
LATTICES
M CENTERS
MEASURED VALUES
METALS, CERAMICS, AND OTHER MATERIALS
NUMERICALS
PHOTOELASTICITY
POLARIZATION
POTASSIUM CHLORIDES
PRECIPITATION
PROTONS
QUANTITATIVE ANALYSIS
RADIATION EFFECTS
REACTION KINETICS
SODIUM CHLORIDES
STRESSES
TEMPERATURE
VACANCIES
VOLUME
X RADIATION