微波固相法制备纳米镧锶镍复合氧化物

以硝酸镧、乙酸锶和乙酸镍为原料，应用微波固相法制备了纳米镧锶镍复合氧化物前驱体。研究表明：控制热分解温度是制备超微纳米粒子的关键。最小粒径产物的制备条件是：微波炉加热功率600W，马弗炉热分解温度600℃，热分解时间5h。XRD和TEM分析结果表明，产物主要物相组成为La0.9Sr0.1NiO3，属钙钛矿相斜方六面体结构，空间群R-3c，平均粒径10～25nm。应用DSC—TG技术对纳米镧锶镍复合氧化物前驱物热分解机理进行了初步探索，得两阶段分解机理函数为G（a）=-ln（ 1-α ） ]^7/12，G（a）=-ln（ 1-α ） ]^4/9。 ：微波固相法；纳米镧锶镍复合氧化物；热分解机理

Preparation of Nanograde La-Sr-Ni Complex Oxides Powders by Solid-state Reaction under Microwave

Precursor of La-Sr-Ni complex oxides nanometer powder was synthesized by solid-state reaction under microwave by using La（NO3）3·6H2O, Sr（CH3COO）2·1/2H2O, Ni（CH3COO）2·4H2O. Experimental result indicates that diameter of the product is greatly affected by the decomposing temperature. The optimum conditions for preparation of the nanograde powder are microwave power = 600W, decomposing temperature = 600℃ and decomposing time = 5h. XRD and TEM studies show that the main product phase is La0.9Sr0.1NiO3, the crystal form is rhombohedral, the space group is R- 3c, and the average particle size is 10～25nm. Besides, the thermal decomposition mechanical function of precursor was obtained from analysis of DSC-TG curves. The function form of first stage is -ln （ 1-α ） ]^7/12, the function form of second stage is -ln （ 1-α ） ]^4/9.