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The dielectric properties of undoped corundum, α-alumina, of different kinds (single crystal or polycrystalline obtained by solid state sintering) have been the subject of numerous studies concerning, in particular, the breakdown strength and the charging behavior (Haddour et al., 2009; Liebault et al., 2001; Si Ahmed et al., 2005; Suharyanto et al., 2006; Thome et al., 2004; Touzin et al., 2010; Zarbout et al., 2008, 2010). The common feature pointed out by most of these investigations is the conspicuous role played by the microstructure and the impurities. It is also established that the microstructure induced by the sintering process (grain size and porosity) goes concomitantly along with impurities segregation at grain boundaries and/or the development of defects in the lattice (Chiang et al., 1996; Gavrilov et al., 1999; Lagerlof & Grimes, 1998; Moya et al., 2003). To some extent, for a given composition, these evolutions can be governed by the sintering conditions, for instance the firing cycle in the case of solid state sintering (Chiang et al., 1996).

Effects of the Microstructure Induced by Sintering on the Dielectric Properties of Alumina