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Niobium deuteride samples are exposed to vacuum sparks with plasma temperatures exceeding 10 keV and a density of greater than 1.0 E23/cm3. An investigation of the surfaces of the niobium deuteride samples by scanning electron microscopy reveals clear signs of surface melting, orifices, bubbles, blisters and cracks. The surface features are explained in terms of a very high vapour pressure of deuterium forming in niobium at temperatures near its melting point. Vacuum sparks touching the surfaces for around 1 micro-s may expel most of the deuterium from the surface region.

Additional information

Authors: SCHOBER T, Forschungszentrum Jülich GmbH, Institut für Plasmaphysik (DE);CONRADS H, Forschungszentrum Jülich GmbH, Institut für Plasmaphysik (DE);SCHULZ A, Ruhruniversität Bochum, Institut für Experimentalphysik V (DE)
Bibliographic Reference: Article: Fusion Technology, Vol. 23 (1993) No. 2, pp. 227-229
Record Number: 199310520 / Last updated on: 1994-11-29
Original language: en
Available languages: en