Papers by Keyword: Citrate Method

Abstract: La_0.7Sr_0.15Ca_0.15Co_1-xFe_xO_3-δ (x=0.1、0.2、0.3、0.4) powders for the applications as the cathode materials in solid oxide fuel cell were synthesized by the citrate method. The results show that the powders calcined at 800°C for 3h were high pure perovskite state and the position of XRD spectra diffraction peak of the cathode materials shifts to the small angle and the grain size of the powders is getting larger with increasing the content of Fe-doped. The open circuit voltage of the single cell made by molding method in the hydrogen/air with La_0.7Sr_0.15Ca_0.15Co_1-xFe_xO_3-δas its cathode got the maximum-value bwteen the the operation temperature from 550°C to 600°C.The maximum power density decreases from 392.85mW/cm2 to 331.99 mW/cm2 with x content increases from 0.1 to 0.4 at the the operation temperature of 650 °C.

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.