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We attempted to fabricate the high-capacitance insulator/conductor composite ceramics with embedded conductive oxide particles insulated by insulator-oxide epitaxial layers to enhance their dielectric breakdown strength. We selected BaTiO3 (BT)/LaNiO3 (LN) composite ceramics because perovskite-type BT is possible to grow epitaxially on the perovskite-type LN due to the similarity of their lattice constants. The LN nanoparticles prepared by the sol-gel method were mixed with TiO2 precursor particles and pressed into green compacts. The BT/LN composite ceramics were fabricated from these green compacts by the conversion reaction of TiO2 into BT in the hydrothermal condition at 175 oC. The effective dielectric constant of the BT/LN composite ceramics with the LN content of 17 mol% is slightly enhanced as compared to the BT ceramics prepared by the hydrothermal treatment because the LN particles acted as the internal electrodes. However, the low resistivity of the fabricated BT/LN composite ceramics suggests that the LN particles were not completely insulated by the insulator epitaxial layer. The decomposition of LN in the hydrothermal treatment and the agglomeration of the LN nanoparticles gave rise to current leakage.

Preparation of Insulator/Conductor Composite Ceramics by Hydrothermal Method and Their Dielectric Properties