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The degradation of/Y'-alumina under electrolytic conditions was investigated at room temperature. With the use of an electrical-mechanical analogue, it was demonstrated that a large current concentration exists at the peripheries of blocked or unwetted areas. Thus, actual current densities at the sites of failure can be several times larger than the average current density. Implications regarding wetting of/Y'-alumina by sodium are discussed. The concept of current focusing at the tips of sodium-filled cracks is demonstrated in a room temperature test.

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In this work, pellet samples of (Ba1−xCaxZr0.1Ti0.9)O3, (0.140 ≤ x ≤ 0.160) were prepared using solid-state reaction route with double sintering. The dielectric and structural properties of the prepared samples were measured, from room temperature to 250 °C, at different frequencies, in the range 10–1000 KHz. A peak shifting anomaly in the X-ray diffraction peaks patterns, an anomalous change in the slope of c/a vs x plot, and the observed minimum values of dielectric constant, loss and conductivity of the prepared compositions show a strong compositional dependent dielectric and structural properties, indicating a morphotropic phase transition type behavior, at the composition with x = 0.150.