Preparation and Ferroelectric Properties of Ca-doped BaTiO3 Nanotubes

In order to explore the microstructures and ferroelectric properties of the Ca-doped BaTiO3 nanotubes, anodic oxidation method was used to generate TiO2 nanotubes. As a template to TiO2 nanotubes, hydrothermal synthesis method was used to prepare the Ca-doped BaTiO3 nanotubes. The microstructures and ferroelectric properties of the Ca-doped BaTiO3 nanotubes arrays, which had gained under different concentrations of calcium hydroxide, was measured and analyzed by scanning electron microscopy(SEM), X-ray diffraction instrument and ferroelectric analyzer respectively. The experiments show that with the increase of Ca(OH)2 concentration, TiO2 nanotubes can be transformed into Ba(1-x)CaxTiO3 nanotubes, and the crystallinity is improved. The Ca(OH)2 doping amount can improve the ferroelectric properties of Ba(1-x)CaxTiO3. When the Ca(OH)2 doping amount is 12%, residual polarization strength of the Ba(1-x)CaxTiO3 nanotubes is up to 1.32 µC/cm2 and coercive field can reach 3.37 kV/cm.