Fig. 5. (a)Micrographs of the specimens treated at 16001C for 2, 4, and
8 h. (b) Conductivity profiles by two-microelectrode measurements as a
function of the normalized distance with respect to the thickness of the
large-grained nitrided layers. (c) Conductivity profiles by one-microelectrode
measurements as a function of the normalized distance.
Fig. 6. Impedance spectra of tetragonal zirconia polycrystal (TZP) region
of the specimen nitrided at 16001C for 2 h (Fig. 5) using two microelectrodes
(a), using one microelectrode at different positions (b, c)
(versus the counterelectrode), while (d) shows a spectrum of the pristine
2 mol% yttria-doped tetragonal zirconia polycrystals (2Y-TZP) ceramics
using macro-sized electrodes.