Abstract
以La(NO3)36H2O、Co(NO3)36H2O和Fe(NO3)39H2O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)36H2O, Co(NO3)36H2O和Fe(NO3)39H2O and Fe(NO3)39H2O 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˚C, 150˚C - 220˚C, 300˚C - 500˚C and 700˚C - 780˚C, respectively. The sample calcined at 700˚C - 800˚C 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˚C, the most amount of perovskite is gained, but the grain size increases more than that of perovskite calcined at 800˚C and 900˚C. With the increase of substitute Fe for Co, perovskite particle size is gradually reduced.
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