La0.5Sr0.5TiO3 nanopowders prepared by the hydrothermal method

La0.5Sr0.5TiO3 nanopowders were prepared by the hydrothermal method. The influence of processing parameters, including KOH concentration, reaction temperature and reaction time on the obtained products were studied. The structure and morphology of the obtained products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The XRD results show that pure phase La0.5Sr0.5TiO3 nanopowders can be successfully synthesized with 2 M KOH concentration at a low temperature of 220 °C for 24 h. In addition, the product has a plate-like shape with particle sizes in the range of 25–100 nm as estimated by TEM.

LRTEM image of the single-phase La0.5Sr0.5TiO3 particles. It is seen from the figure that the product has a plate-like morphology with average particles sizes in the range of 100–300 nm. In addition, the SAED data taken from an individual particle (lower inset) shows the presence of sharp diffraction rings, which are indicative of polycrystalline La0.5Sr0.5TiO3 formation. The high-resolution TEM image (upper inset) shows for further confirmation of a crystalline structure of La0.5Sr0.5TiO3 powder. This image shows a clearly resolved crystalline domain with uniform interplanar spacing of 0.276 nm.Figure optionsDownload as PowerPoint slideHighlights
► La0.5Sr0.5TiO3 nanopowder is prepared in 2 M KOH solution by hydrothermal method.
► The solution is heat treated at 220 °C for 24 h in air.
► LRTEM reveals a plate-like morphology of particle with average size of 100–300 nm.
► HRTEM image shows a crystalline domain with interplanar spacing of 0.276 nm.