Synthesis and microstructural TEM investigation of CaCu3Ru4O12 ceramic and thin film

CaCu3Ru4O12 (CCRO) is a conductive oxide having the same structure as CaCu3Ti4O12 (CCTO) and close lattice parameters. The later compound is strongly considered for high density parallel plates capacitors application due to its so-called colossal dielectric constant. The need for an electrode inducing CCTO epitaxial growth with a clean and sharp interface is therefore necessary, and CCRO is a good potential candidate. In this paper, the synthesis of monophasic CCRO ceramic is reported, as well as pulsed laser deposition of CCRO thin film onto (001) NdCaAlO4 substrate. Structural and physical properties of bulk CCRO were studied by transmission electron microscopy and electron spin resonance. CCRO films and ceramic exhibited a metallic behavior down to low temperature. CCRO films were (001) oriented and promoted a CCTO film growth with the same orientation.

Graphical AbstractStructure of CaCu3Ru4O12 showing the RuO6 octahedra and the square planar environment for Cu2+.Figure optionsDownload as PowerPoint slideHighlights
► In this study, we investigate the structural properties and microstructure of ceramics CaCu3Ru4O12.
► We study the conduction properties of polycrystalline material.
► Then we synthesize the conductive thin film which is deposited on a high K material with the same structure (CaCu3Ti4O12).