Development of Cr Doped M-type Dispenser Cathode

In this paper, we doped Cr into the emission materials of M type dispenser cathodes, and then studied the existing form of Cr in different stages of emission materials and the emission performance of corresponding M type cathodes. The results show that the emission performance of Cr doped M-type cathode is related to the amount of Cr. The Cr-doped cathode with the best emission performance has a pulse emission current of 44.59A/cm
²
at
$1050^{\circ}\mathrm{C}_{\mathrm{B}}$
. In the high-temperature solid state reaction products of the emission materials, Cr mainly exists in the form of chromates composed of Ba, Cr and O. The composition and valence of Cr are related to the doping amount.