1,000 A/cm2 cathode: To be or not to be?

Method of obtaining sintered and pressed composed materials based on Ba
_x
Sr
_1-x
HfO
₃
, where x = 0.25, 0.50, 0.75, with 16, 20, 24, 60 % W (by mass), and experimental results of thermionic properties investigations of these materials are represented. The composition of 80% Ba
_0.75
Sr
_0.25
HfO
₃
- 20 % W (by mass) is characterized by the thermionic current density of 1014 A/cm
²
at T = 1620 K.