Abstract
Anisotropie expansion of the BeO lattice leads to the storing of strain energy in a polycrystalline material owing to grain boundary constraint. At low irradiation temperatures and doses below about 5 × 10 20 nvt at least, this strain energy can be estimated from X-ray lattice expansion data. At elevated temperatures or higher doses however, crystal growth due to irradiation-induced defects that do not affect the lattice parameters, e.g. dislocation loops, may contribute appreciably to the strain energy. British work aimed at determining the role of irradiation-induced defects is summarised.
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