微波固相反应合成La_(1-x)Sr_xCoO_3阴极材料的研究

INVESTIGATION ON SYNTHESIS OF La_1-xSr_xCoO_3 BY MICROWAVE IRRADIATION TECHNIQUE

以碳酸盐或氧化物为原料,采用微波固相反应合成技术成功地合成了纯钙钛矿结构的La1-xSrCoO3(LSC,x=0.10～0.50)粉体。研究表明:La2O3和SICO3是2.45 GHz微波透明材料,而Co3O4则具有很强的微波偶合吸收能力;La2O3,SrCO3,Co3O4混合料中SrCO3含量对混合物的微波吸收行为以及LSC的合成条件有很大影响。与传统的固相反应合成法相比,微波固相反应合成法的反应合成时间大大缩短,在输出功率700～800 W条件下,反应时间≤25 min,这归因于反应物与微波的直接偶合和反应物对微波能量的高效率吸收。

The pure perovskite structure composition La1-xSrxCoO3(LSC, x = 0. 10-0. 50) powders were synthesized with microwave irradiation technique, using corresponding nitrate or carbonate as raw materials. Results show that the La2O3 and SrCO3 are transparent to 2.45 GHz microwave , whereas Co304 behaves with a strong coupling and absorbability with this waveband.. The contents of SrCO3 in mixture play a great influence on the microwave coupling and absorbability of the mixture. In comparison with traditional solid-state reaction synthesis route, the reaction time is greatly reduced by microwave irradiation solid-state reaction technique. When the output power of microwave oven is 700-800 W, reaction time can less than or egual to 25 min, due to the reac-tants effectively absorb the microwave energy. The high efficiency is attributed to that the reactants couple directly with the microwave and absorbit.