Diamond-Based Field-Emission Displays
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MRS BULLETIN/MARCH 1996
their willingness to release bonding electrons. Hence cesium melts at a low temperature (28.5°C) and has a high vapor pressure (10~3 torr at 100°C). Cesium, when put into a vacuum structure, eventually migrates everywhere. It spreads to surfaces where electron emission is not desired and can make insulating surfaces undesirably conductive. It also spreads to interelectrode spaces where it will provide a relatively easy path for gaseous conduction and electrical arcs. Diamond, in contrast, behaves as a refractory material that does not melt but rather sublimes at 3550°C and has an associated low vapor pressure (
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