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Aluminum nitride (AlN) ceramics were sintered with spark plasma sintering (SPS) technique using Y2O3 (Sm2O3)–CaF2 as the sintering additives. The purification effect of sintering additives, dielectric properties, microstructure and polarization mechanism of AlN ceramics were investigated. The densification process curves indicate that both sintering additive and special SPS sintering mechanism are...
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