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xY b2O3–15(20Ni–Cu)/(85- x)(NiF e2O4–10NiO)(x = 0, 0.25, 0.5, 0.75, 1.0, 2.0, and 10.0) cermets for aluminum electrolysis were prepared to investigate the effect of Yb2O3 doping on the grain boundary of the cermets after sintering. The results showed that