摘要
以La(NO3)3?6H2O、Co(NO3)3?6H2O和Fe(NO3)3?9H2O为原料,用共沉淀法对制备LaFexCo1?xO3 (x = 0.2, 0.5, 0.8)钙钛矿进行研究。热重–差示量热分析(TG-DSC)和X射线衍射(XRD)分析表明,合成LaFexCo1?xO3钙钛矿过程有四段失重,分别在110℃之前、150℃~220℃、300℃~500℃和700℃~780℃;经过700℃~800℃煅烧后有钙钛矿形成,之后随煅烧温度提高,钙钛矿生成量逐渐增加,晶粒尺寸也缓慢增加,煅烧温度为1000℃时获得钙钛矿的量最多,但是与800℃和900℃煅烧后形成钙钛矿相比,其晶粒尺寸增加较多;随着Fe取代Co的量增加,形成钙钛矿尺寸晶粒尺寸逐渐降低。
Preparation of LaFexCo1-xO3 (x = 0.2, 0.5, 0.8) perovskite by coprecipitation using La(NO3)3·6H2O, Co(NO3)3·6H2O和Fe(NO3)3·9H2O and Fe(NO3)3·9H2O as raw materials was researched. The phenomena observed were characterized using Thermogravimetry-Differential Scanning Calorimetric (TG-DSC) and X- ray diffraction (XRD). Results showed that process of preparing LaFexCo1-xO3 perovskite appeared four period of weight loss at less than 110℃, 150℃ - 220℃, 300℃ - 500℃ and 700℃ - 780℃, respectively. The sample calcined at 700℃ - 800℃ has already formed perovskite, then amount of forming perovsktie and the grain size of perovskite increase gradually with the calcination temperature. When calcination temperature is at 1000℃, the most amount of perovskite is gained, but the grain size increases more than that of perovskite calcined at 800℃ and 900℃. With the increase of substitute Fe for Co, perovskite particle size is gradually reduced.
作者
杨雨晴
石凯
Yuqing Yang;Kai Shi(Zhengzhou Foreign Language School,Zhengzhou Henan;School of Materials Science and Engineering,Henan University of Technology,Zhengzhou Henan)
出处
《自然科学》
2016年第4期378-383,共6页
Open Journal of Nature Science
