Abstract
In this paper the defect structure of platinum during homogeneization quenching has been studied by transmission electron microscopy on electropolished foils. Several black dots about 100 A in diameter have been observed on the foils, corresponding to a density of the order of 1014 −3. The dots have been interpreted as clusters of vacancies retained in the presence of impurities. The analysis of the number of quenched-in vacancies leads to the conclusion that the clusters are spherical and about 110 A in diameter.
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