微波固相法制备纳米镧锶镍复合氧化物  

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

作　　者：李大光[1] 赵丰华[2] 章弘毅[2] 李铁虎[1] 郭清泉[2] 张鹤丰[2] 

机构地区：[1]西北工业大学材料科学与工程系,陕西西安710072 [2]广东工业大学轻工化工学院,广东广州510006

出　　处：《纳米科技》2008年第1期53-59,共7页

摘　　要：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；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.

关 键 词：微波固相法 纳米镧锶镍复合氧化物 热分解机理 

分 类 号：O643.13[理学—物理化学]