Facile Molten Salt Synthesis of Single Crystalline Calcium Copper Titanate Nanostructures and Its Giant Dielectric Properties

摘要

Well defined nanostructures of calcium copper titanate, a distinguished giant dielectric perovskite has been synthesized through a convenient molten salt synthesis technique. The technique is not only blessed with high yield but can readily generate wide range of morphologies from nanoparticles to nanocubes in reproducible way. The structural and compositional properties of powders and sintered pellets are analyzed by X-ray diffraction, high-resolution transmission electron microscopy, field emission scanning electron microscopy, and energy dispersive X-ray spectroscopy. Time resolved morphological evolution suggests a secondary growth mechanism involving Ostwald ripening. Sintered pellets of CCTO ceramic synthesized through this method exhibit high value of dielectric permittivity with good thermal stability in the temperature range of 25-160℃.