Hall Effect in Oxide Cathodes

Abstract

The measurement of Hall effect in oxide cathodes has been carried out in various methods of preparing samples.
The apparent electron mobility in a temperature range, 700°K∼1200°K, was about 10³∼10⁴cm²/v. sec.
These values are very high as compared with that for a single crystal. The effect of porosity upon the mobility seems to exist to some extent, the porosity being changed by means of the different preparations and treatments of the cathodes.
From the viewpoint of pore conduction the mean free path of an electron is about 10⁻⁶∼10⁻³cm which seems to be of the same order with the size of pores existing in the actual oxide cathodes.