Preparation of Giant Dielectric CaCu₃Ti₄O₁₂ Ceramics via the Molten Salt Method from NaCl Flux

CaCu₃Ti₄O₁₂ (CCTO) powders have been synthesized by the molten salt method using NaCl as the flux. The effects of the synthesis temperature on their crystal structures and micromorphologies were investigated in this study. A new secondary phase, Na₂Ti₆O₁₃, was found in the as-synthesized powders when the temperature exceeds 800°C. Na₂Ti₆O₁₃ and CuO secondary phases result in a significant increase in the dielectric constant and a certain increase in the dielectric loss. 800°C is a suitable synthesis temperature to prepare CCTO ceramics with relatively good dielectric performance using NaCl as the molten salt.