Radiation Damage Effects in Insulators for Fusion Reactors: Microstructure Evolution in MgO-Al₂O₃ System Oxide Crystals

Abstract:

Characteristic features of radiation damage in insulators for fusion reactors are that those materials are exposed to synergistic radiation damage of elastic displacements and electric excitation with the presence of an electric field. This paper describes the nucleation-and-growth of radiation-induced defects and their stability in oxide ceramics, such as magnesium-aluminate spinel (MgAl2O4) and alpha-alumina (α-Al2O3). Microstructure evolution in these oxides is shown through transmission electron microscopy for the formation process of dislocation loops under synergistic irradiation with displacements and ionizing radiation, the stability of dislocation loops, and the nucleation-and-growth process of loops with an applied electric field.

• Periodical: Advances in Science and Technology (Volume 45)
• Pages: 1961-1968
• DOI: https://doi.org/10.4028/www.scientific.net/AST.45.1961
• Online since: October 2006
• Authors: Kazuhiro Yasuda, Syo Matsumura
• Keywords: Dislocation Loops, Displacement Damage, Electric Field, Electronic Excitations, Fusion Materials, Oxide Insulating Ceramics, TEM

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