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VOLUME 17 (1973) | ISSUE 5 | PAGE 247
Observation of the Drawing Out of Needles by Electric Fields
It has been observed that when tungsten needles are heated to 2300 2700°K in an electric field (3-6) x 107 V/cm, the needles become sharper and elongated in directions normal to the close-packed faces, in contrast to earlier observations. The experiments were performed by field-emission electron microscopy with needles having radii 0.1 1,5 U.