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A second calcination–milling step was introduced in the conventional processing of (K, Na) 0.5 NbO 3 (KNN) ceramics (sintered in air) to further homogenenize the particle size distribution of the pre-sintered powders. The ceramic derived from the powders prepared by the two-step route possesses grains with better uniformity and is more compact. The relative density of the bulk ceramic...
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