Radiation products and tunneling process in ionic glasses. I. Radiation products and recombination in undoped nitrate and acetate glasses

Journal Article · Thu Oct 05 04:00:00 EDT 1978 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100509a001· OSTI ID:6577057

Barkatt, A ^[1]; Angell, C A; Miller, J R

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1. Purdue Univ., West Lafayette, IN

Ionizing radiation acts on 3 : 2 KNO/sub 3/--Ca(NO/sub 3/)/sub 2/ glasses to produce a simple hole center, the NO/sub 3/ radical, and an excess electron center, which is probably the NO/sub 3//sup 2 -/ radical. At 297/sup 0/K, 10/sup -6/ s after a 4-ns pulse of radiation a yield of 3.2 +- 0.2 ion pairs is found per 100 eV of absorbed energy. The ion pairs recombine, as observed by following the red absorption of NO/sub 3/ (lambda/sub max/ 615 nm), from 10/sup -6/ to 10/sup 2/ s. Diffusion of the reacting species is involved above the glass transition temperature (T/sub g/ = 341/sup 0/K), while electron tunneling seems to be the main mechanism below T/sub g/. The reaction is weakly temperature dependent (E/sub A/ approximately equal to 3 kcal) from 77 to 260/sup 0/K, but E/sub A/ jumps to approximately 18 kcal above 260/sup 0/K. These results are discussed in terms of modern electron-transfer theories, which predict such a transition from weak to strong activation. Acetate glasses showed no detectable radiation coloration in the visible, and only a small, decaying absorption in the near UV. 2 figures, 37 references.

• OSTI ID: 6577057
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 82:20; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ABSORPTION
ABSORPTION SPECTRA
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM NITRATES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
DIFFUSION
ELECTRON TRANSFER
ENERGY ABSORPTION
GLASS
HOLES
ION PAIRS
IRRADIATION
KINETICS
LOW TEMPERATURE
MEDIUM TEMPERATURE
NITRATES
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
POTASSIUM NITRATES
PULSED IRRADIATION
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIOLYSIS
REACTION KINETICS
RECOMBINATION
SPECTRA
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TIME DEPENDENCE
TRANSITION TEMPERATURE
TUNNELING
ULTRAVIOLET SPECTRA
VISIBLE SPECTRA
YIELDS