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LaB6 crystal used

Lanthanum hexaboride (LaB6) cathode (Kimball Physics Inc.) after about 2 ½ years use as the electron source in the CAIC Tecnai TEM. The LaB6 crystal at the centre is held in place by a carbon ferrule (round, surrounding structure) and shows shortening and pitting due to extended use (Karin Müller, CAIC).
LaB6 crystal used
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