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Abstract
A comparative study of damage accumulation in magnesium aluminate spinel (MgAl2O4) has been conducted using ionoluminescence (IL), cathodoluminescence (CL) and Rutherford Backscattering Spectrometry/channeling (RBS/C) techniques. MgAl2O4 single crystal and polycrystalline samples were irradiated with 320 keV Ar+ ions at fluencies ranging from 1 × 1012 to 2 × 1016 cm−2 in order to create various levels of radiation damage. RBS/C measurements provided quantitative data about damage concentration in the samples. These values were then compared to the luminescence measurements. The results obtained by IL and RBS/C methods demonstrate a two-step character of damage buildup process. The CL data analysis points to the three-step damage accumulation mechanism involving the first defect transformation at fluencies of about 1013 cm−2 and second at about 1015 cm−2. The rate of changes resulting from the formation of nonluminescent recombination centers is clearly nonlinear and cannot be described in terms of continuous accumulation of point defects. Both, IL and CL techniques, appear as new, complementary tools bringing new possibilities in the damage accumulation studies in single- and polycrystalline materials.
Highlights
The development of new material expected to be used in a radiative environment requires the solution of numerous problems, one of them being related to the quantitative analysis of radiation disorder in materials
The problem of information about damage buildup, intensively studied for single crystals by the Rutherford Backscattering Spectrometry/channeling (RBS/C) technique (Tesmer et al 1995), poses many difficulties for polycrystalline materials. It is especially a serious practical problem, as most of the investigated materials are single crystals, while these are the polycrystals which find the practical application in construction of nuclear reactors
A typical CL spectrum recorded for the magnesium aluminate spinel exhibits two broad bands, the first of which is positioned around 400 nm and demonstrating strong intensity of the luminescence signal
Summary
The development of new material expected to be used in a radiative environment requires the solution of numerous problems, one of them being related to the quantitative analysis of radiation disorder in materials. The problem of information about damage buildup, intensively studied for single crystals by the Rutherford Backscattering Spectrometry/channeling (RBS/C) technique (Tesmer et al 1995), poses many difficulties for polycrystalline materials. It is especially a serious practical problem, as most of the investigated materials are single crystals, while these are the polycrystals which find the practical application in construction of nuclear reactors. The studied case is one of the candidates for inert matrix fuels and alternative waste immobilization matrix, MgAl2O4
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