Scandia　(Sc)-doped　pressed　cathodes　were　prepared　by　different　methods,　including　mixing　of　scandium　oxide　and　barium-calcium　aluminates　with　tungsten　by　manual　mechanical　mixing,　high-energy　ball-milling,　and　liquid-liquid　doping.　The　surface　behavior　of　the　active　substance,　microstructure,　and　emission　properties　of　the　cathodes　has　been　studied　by　auger　electron　spectroscopy,　scanning　electron　microscope,　and　an　emission　test　apparatus.　Results　show　that　the　cathodes　prepared　by　the　liquid-liquid　doping　method　have　a　fine　microstructure.　This　kind　of　cathode　has　a　submicrometer　semispherical　tungsten　grain　structure　with　homogeneous　distribution　of　Sc　and　barium-calcium　aluminates　which　are　dispersed　over　and　among　tungsten　grains.　The　cathodes　prepared　by　the　liquid-liquid　doping　method　exhibited　good　emission　properties,　e.g.,　the　current　density　of　this　cathode　reached　46　A/cm(2)　at　850　degrees　C(b).