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Abstract: PbWO4 dendrites have been successfully synthesized by a simple sonochemical method without any surfactants at room temperature. The as-prepared powders were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), electron diffraction (ED), and high-resolution transmission electron microscopy (HRTEM). The effect of pH value, molar ratio of [WO4 2−]/[Pb2+], reaction time, and the initial concentration of the starting solution on the formation of PbWO4 dendrites was investigated. Experimental results indicate that the molar ratio of [WO4 2−]/[Pb2+] played a crucial role in the formation of PbWO4 dendrites. A growth mechanism of PbWO4 dendrites was also discussed. The present process is proved to be environment-friendly, and can be extended to the controllable synthesis of other tungstates. [Copyright &y& Elsevier]

Abstract: In this paper, we report a simple hydrothermal method to synthesize barium strontium titanate (Ba1−x Sr x TiO3, x =0–1) dendrites without any templates. The obtained products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), electron diffraction (ED), and energy-dispersive X-ray spectroscopy (EDX), respectively. All the samples were identified as cubic perovskite phase by XRD and the obtained Ba1−x Sr x TiO3 (x =0–1) dendrites were single-crystal. The formation process of Ba1−x Sr x TiO3 dendritic structures was also investigated. It is rational to expect that dendritic structures of other perovskite oxides may also be synthesized by this simple method. [Copyright &y& Elsevier]

Abstract: In this paper, we report a simple hydrothermal method without any surfactants, for the first time, to synthesize single-crystal BaTiO3 dendrites. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron diffraction (ED), and high-resolution transmission electron microscopy (HRTEM). The KOH concentration was found to be vital to the final formation of BaTiO3 dendrites. An obvious morphology evolution from sphere-like shape to dendrite was observed when KOH concentration was decreased from 1 M to 0.1 M. It is rational to expect that dendritic structures of other perovskite oxides may also be synthesized by this simple method. [Copyright &y& Elsevier]