Features of the Real Structure of Lanthanum Hexaboride Polycrystalline

The Microstructure of lanthanum hexaboride (LaB₆) polycrystalline has been studied by using transmission electron microscope. This shows that the ideal LaB₆ polycrystalline can be obtained by sintering ingots at the temperature of 2273 K for holding time of 120 min in Ar pressure of 800 Torr, where the ingots are formed by pressing LaB₆ powder at room temperature at a pressure of 0.4-0.5 GPa. The particles in LaB₆ polycrystalline hardly bind; there are only a few of pores at the joint parts of three particles and a few of impurities exist in some pores. The sintering process for fabricating LaB₆ polycrystalline is analysed and the formation of the pore and the impurities are studied from the point of surface tension.