Synthesis of BaTiO-CaTiO and BaTiO-SrTiO Core-Shell Nanocubes via the Surface Reconstruction of BaTiO Nanocubes.

BaTiO-CaTiO and SrTiO-BaTiO core-shell nanocubes were synthesized through the surface reconstruction of BaTiO nanocubes, which involved the reaction of titanium oxide with Ca(OH), Sr(OH), or Sr(OH)·8HO in water at 100 °C. The core-shell structure comprised a BaTiO nanocube core and a CaTiO or SrTiO shell. The outermost layer with a perovskite structure also comprised CaTiO or SrTiO, and its thickness was several hundred picometers.