lanthanum hexaboride single-crystal tip
lanthanum hexaboride single-crystal tip
A tip used as a thermoelectron source. A lanthanum hexaboride (LaB6) single crystal, which is sharpened to a cone shape, is used. The LaB6 tip is indirectly heated at about 1800 K. Its brightness is 5×106 A/cm2.sr at 200 kV. The size of the crossover is ～10 μm. The energy spread of the emitted electrons from the filament is ～2 eV.
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