Papers by Author: Zheng Lin

Abstract: Lead-free (1-x)Bi_0.5Na_0.5TiO₃-xBaTiO₃ (BNT-xBT) nano-powders synthesized by a modified citrate method and the sintered ceramics were characterized using various techniques. The r_{Subscript text}esults indicated that all the BNT-xBT samples were homogeneous with a pure perovskite crystal structure. It is found BNT-0.1BT exhibit_{Subscript text}s the best ferroelectric properties. BNT-0.0_{Subscript text}6BT has excellent performance in thermo-electrical energy conversion.

Abstract: Ferroelectric0.90Bi_0.5Na_0.5TiO₃-0.10BaTiO₃ (0.90BNT-0.10BT) thin film with single perovskite phase is prepared using an improved sol-gel spin coating method onto indium-tin-oxide (ITO) glass substrates. A new solution process is developed for the preparation of precursor solution which is stable in air, presenting a low gelation and trend to the formation of precipitates. The as-prepared thin film is crystallized into single perovskite phase and has good ferroelectric properties. It is remarkable that the thin films show excellent heat-to-electrical energy conversion properties. The results of this work for the first time demonstrate the feasibility of using lead-free BNT-BT films for pyroelectric energy harvesting.

Abstract: Ti-SBA-15 mesoporous materials were directly synthesized via a hydrothermal process and characterized by using nitrogen adsorption-desorption measurements, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, diffuse reflectance ultraviolet-visible spectroscopy, and infrared ray spectroscopy. The effect of synthesis temperatures on the structure and catalytic efficiency in epoxidation of cyclohexene was discussed in details. The results showed that the optimal temperature was 100 °C under the reaction conditions.