Numerous large helical dislocations with lengths up to 4 mm and diameters between 10 and 130 μm have been observed in molybdenum by means of X‐ray topography. From these observations an equilibrium vacancy concentration of about 3 × 10−6 at 2000 °C in molybdenum is derived.
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Becker et al. (1969) studied this question.
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