The structure and phase composition of lanthanum hexaboride ceramic material samples prepared by sintering are investigated. It was found that the formation of a high-quality consolidated structure with closed pores is observed at a sintering temperature of 1850 ° C. It is shown that the addition of nickel intensifies the sintering process and neutralizes the effect of the sintering temperature on the grain size and pore volume fraction. Nickel was found both in the main material of LaB 6 grains and in the form of fine intermetallic compounds at grain boundaries
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