Grain Boundary Nanostructure and High Temperature Plastic Flow in Polycrystalline Oxide Ceramics
High temperature creep and superplastic flow in high-purity, polycrystalline oxide ceramics is very sensitive to a small amount of doping by various oxides. The doping effect is attributed to change in grain boundary diffusivity owing to grain boundary segregation of the doped cations. The doping effect on the grain boundary diffusivity is caused mainly by change of chemical bonding state in the vicinity of the grain boundary segregated with the doped cations. In other words, controlling of grain boundary nanostructure based on the doping process will be a useful way to develop new high-performance functional ceramics in the near future.
T. Chandra, N. Wanderka, W. Reimers , M. Ionescu
H. Yoshida et al., "Grain Boundary Nanostructure and High Temperature Plastic Flow in Polycrystalline Oxide Ceramics", Materials Science Forum, Vols. 638-642, pp. 1731-1736, 2010