The requirements of the electron gun in SEM are high brightness and small electron energy spread. There are three commonly used types at present, tungsten filament, lanthanum hexaboride (LaB6) filament, and field emission. Different filaments have differences in the size of the electron source, the amount of current, the current stability and the life of …
Continue reading “Three Commonly Used Filaments for Electron Gun in SEM”
Lanthanum hexaboride (LaB6) single crystal is a special structure crystal, which has good conductivity and low work function. When working at 1400~1680 °C, it can obtain DC emission current of 0-100A/cm2, far better than oxide and other pure metal cathodes. The cathode characteristics of lanthanum hexaboride are as follows: – Extended Life – Thousands of Hours …
Continue reading “Lanthanum Hexaboride Cathodes From Different Manufacturers”
Advanced Ceramic Materials