Transport processes in metal halide gas discharge
W. van Erk
Philips Lighting BV, Building EEC-4, P.O. Box 80020,
5600JM, Eindhoven, The Netherlands
Abstract: An overview is given of transport reactions and corrosion
phenomena in metal halide gas discharge lamps filled with a mixture
of alkali halides with scandium or rare-earth iodides. The phenomena
that are discussed are: (a) pressures of light-emitting species above
the molten salt mixture, (b) interaction of the metal halides with the
vessel wall, quartz glass as well as polycrystalline alumina, (c) transport
processes along the vessel wall giving rise to wall corrosion, and (d)
transport to and from the electrodes (i.e., electrode corrosion and
*Lectures from the 10th International Conference
on High Temperature Materials Chemistry (HTMC-X), Jülich, Germany,
10-14 April 2000. Other presentations are published in this issue, pp.
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