Features of the real structure of lanthanum hexaboride polycrystalline

The microstructure of lanthanum hexaboride (LaB6) polycrystalline has been studied by using transmission electron microscopy. This shows that the idea l LaB6 polycrystalline can be obtained by sintering ingots at the temperatu re of 2273 K for a holding time of 120 min in Ar pressure of 800 Torr, wher e the ingots are formed by pressing LaB6 powder at room temperature at a pr essure of 0.4-0.5 GPa. The particles in LaB6 polycrystalline hardly bind; t here are only a few pores at the joint parts of three particles and a few i mpurities exist in some pores. The sintering process for fabricating LaB6 p olycrystalline is analysed and the formation of the pore and the impurities are studied from the point of surface tension.