Sintered Lanthanum Hexaboride

Lanthanum Hexaboride is opaque, appears reddish purple when dry, and dark red when wet. Sintered Lanthanum Hexaboride has a cubic crystal structure, has high hardness, high conductivity, high melting point and good chemical stability, low evaporation rate at high temperature, high emission current density and other excellent properties. It has been used in electron microscopes, electron beam welding, discharge tubes, etc. Such applications require large emission currents.Typical products are Lanthanum Hexaboride Rod, Sputtered Lanthanum Hexaboride, Lanthanum Hexaboride Emitter (Lab6 Emitter).

One of the important characteristics of LaB6 as a cathode material is that it has the characteristics of high emission current density and low evaporation rate at high temperature. Under the same emission current density, the evaporation rate of LaB6 cathode material at high temperature is lower than that of general cathode materials. Compared with tungsten cathodes, under the same emission current density, the evaporation rate of LaB6 cathodes is much lower than that of tungsten cathodes, and the low evaporation rate is an important factor in prolonging the service life of the cathode.

Lanthanum Hexaboride material also has low work function characteristics. For example, the lanthanum hexaboride cathode used in the thermal ion emission scanning electron microscope uses sufficient energy for electrons to overcome the work function and emits under high temperature conditions. Therefore, the low LaB6 The power function can be performed at low temperature (1,300 degree C), and at the same time, the volatilization of the material can be reduced, and the brightness is higher. However, the LaB6 material itself has strong activity and low activation energy. It needs to be operated in a good vacuum environment, and then increase The development and application cost of LaB6 material has been reduced. In addition, LaB6 cathode also has the advantages of high conductivity, low thermal expansion, resistance to ion bombardment, resistance to strong electric fields, and strong resistance to radiation.

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