Enhanced breakdown strength and dielectric properties of Bi0.0025Nb0.0025Ti0.995O2–Bi2Ti4O11 ceramics sintered at 1130 °C

Giant permittivity in (Nb0.5La0.5)xTi1‐xO2 ceramics prepared by slip casting in a strong magnetic field

“…The grain size gradually decreases as composition x rises, and the texture degree is enhanced. This result is precisely the opposite of the previous reports that the grain size in co‐doped TiO 2 ceramics rises as the doped amount, 38,39 which may be attributed to the grain orientation induced by the applied magnetic field. Some tiny white particles embedded in the grains are visible in all of the SEM images of textured ceramics exhibited in Figure 3D–J, and according to the EDS (Figure 3J–L) points results, these particles are determined to be La‐rich second phases.…”

“…The average grain sizes are 22.71, 21.45, and 22.83 μm, respectively. This is different from the solid‐state method, in which the grain size of co‐doped TiO 2 ceramics prepared by the solid‐state method increases with the increase of doping amount 38,39 . In this experiment, the grain size of (Nb 0.5 La 0.5 ) x Ti 1‐ x O 2 ceramics of 0 T prepared by slip casting has no discernible correlation with the doping amount x .…”

“…This is different from the solid-state method, in which the grain size of co-doped TiO 2 ceramics prepared by the solid-state method increases with the increase of doping amount. 38,39 In this experiment, the grain size of (Nb 0.5 La 0.5 ) x Ti 1-x O 2 ceramics of 0 T prepared by slip casting has no discernible correlation with the doping amount x. This difference in grain size may be related to the preparation of suspension, the addition of dispersant, and the adjustment of pH value during the experiment.…”

“…Elongated grains have been noticed to be neatly coaxial on the parallel magnetic field plane. However, the average grain size reduces as composition x increases from 0.0025 to 0.01, which is opposite to other untextured TiO 2 ‐based giant permittivity materials 38,39 . As x = 0.0025, 0.005, and 0.01, the average grain lengths are 52.44, 35.09, and 31.42 μm, and the average grain widths are 25.75, 16.73, and 14.37 μm, respectively.…”

“…However, the average grain size reduces as composition x increases from 0.0025 to 0.01, which is opposite to other untextured TiO 2 -based giant permittivity materials. 38,39 As x = 0.0025, 0.005, and 0.01, the average grain lengths are 52.44, 35.09, and 31.42 μm, and the average grain widths are 25.75, 16.73, and 14.37 μm, respectively. Figure 3G-I show SEM images of (Nb 0.5 La 0.5 ) x Ti 1-x O 2 ceramics of 12 T-pe with the components of x = 0.0025, 0.005, and 0.01, respectively.…”