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Six rare‐earth tantalate high‐entropy ceramics of (5RE.2)Ta3O9 (RE represents any five elements selected from La, Ce, Nd, Sm, Eu, Gd) were designed and prepared by spark plasma sintering process at 1400°C in this study. The (5RE.2)Ta3O9 ceramics only consist of a single‐phase solid solution with perovskite structure. Their relative densities are all above 90%, and the average grain size is in the...
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