COLOR CENTERS IN MIXED CRYSTALS OF ALKALI HALIDES

Journal Article · Mon Apr 01 04:00:00 EST 1963 · Physical Review (U.S.) Superseded in part by Phys.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.130.113· OSTI ID:4724169

Smakula, A; Maynard, N C; Repucci, A

Single crystals of KCl, RbCl, KBr and mixed crystals of KCl-RbCl, KCl- KBr, and RbCl-KBr of various compositions were colored by 3-Mev electrons with doses 10/sup 4/ to 10/sup 6/ rads at 20 deg , -80 deg , and --190 deg C. The influence of radiation dose. coloration temperature, and composition of mixed crystals on spectral position, half-width, and intensity of the V/sub 1/, K, F, F', and M bands was studied. At room temperature K, F. and M bands were produced, and at highest coloration N bands; oniy F and K bands appear at -80 deg C. At --190 deg C coloration the V/sub 1/, K, F, and F' bands appeared. In mixed crystals the spectrai position of all absorption bands deviates from the Mollwo relation (vd/sup n/ = const). The deviation in V/sub 1/, K, F, and M is toward lower, and in F' toward higher energy. The half-width of all bands in mixed crystals is greater than in pure components except that of V/sub 1/ in the KCl- RbCl system, where it is smaller. The intensity of coloration in KCl-RbCl decreases with composition and reaches a iainimum at molar ratio 1: 1. In KCl-KBr and RbCl-KBr the intensity curves exhibit a relative maximum and a relative minimum. The behavior of the observed color-center bands is correlated to crystal structure and to the configuration of color centers. (auth)

• Research Organization: Massachusetts Inst. of Tech., Cambridge
• NSA Number: NSA-17-016759
• OSTI ID: 4724169
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 130; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALKALI METALS
COLOR
COLOR CENTERS
ELECTRON BEAMS
ENERGY LEVELS
EQUATIONS
HALIDES
IRRADIATION
LATTICES
LOW TEMPERATURE
METALS, CERAMICS, AND OTHER MATERIALS
MIXING
POTASSIUM BROMIDES
POTASSIUM CHLORIDES
QUANTITY RATIO
RADIATION DOSES
RUBIDIUM CHLORIDES
SPECTRA
TEMPERATURE
VACANCIES