Effect of Sintering Temperature on Structural and Dielectric Properties of Li0.30Cr0.02Ni0.68O Ceramic Doped With Kaolinite
Keywords:
Li0.30Cr0.02Ni0.68O, Kaolinite, Dielectric propertiesAbstract
Li0.30Cr0.02Ni0.68O (LCNO) ceramics were prepared by sol–gel process and then doped with 1 %wt. kaolinite via solid state reaction. All doped samples were sintered at 1100-1300 °C. All sintered samples showed the single phase of cubic rock-salt NiO structure without extra phases. The microstructure of LCNO exhibited polyhedral grains with grain size of 10-50 µm. With doping 1 %wt. kaolinite, the grain sizes were decreased to 0.5-5 µm. The grain sizes were increased with an increase of sintering temperatures. The grains were denser and larger as sintering temperature increased to 1300 °C. The dielectric properties of the 1% wt. kaolinite-doped LCNO ceramic were the highest dielectric constant (3.40 x 105) at 10 kHz and room temperature. Its loss tangent was 2.44 which was 2 times lower than that of the pure LCNO. The high dielectric constants can be explained by BLCs model.
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