【摘要】 采用自蔓延高温合成法 (SHS)制备 L a1 - x Srx Mn O3-δ复合氧化物。当 y=0 .6时 ,合成出的产品是纯的L a1 - x Srx Mn O3-δ粉末 ;研究了 L a2 O3- Sr O2 - Mn- KMn O4 合成系统在加热过程中的物理化学变化规律 ,在 6 0 0℃左右L a1 - x Srx Mn O3-δ主相已经形成 ;从化学动力学的角度用扩散过程机理解释了燃烧温度与燃烧速度的关系 ,随着 y值的减小 ,即 Mn含量的增加 ,燃烧反应速度有一峰值 ,而燃烧温度随着 Mn含量的增加有所上升 ,当温度升至 14 73K时 ,燃烧温度曲线有一平台 ,上升缓慢 ;以及添加稀释剂后对燃烧温度和燃烧速度的影响 ,随着稀释剂加入量的增加 ,燃烧温度和燃烧速度都减慢更多还原

【Abstract】 Self-propagating high-temperature synthesis (SHS) was used to produce complex oxide La 1-xSr xMnO 3-δ. While y=0.6, the La 1-xSr xMnO 3-δ powder is pure. By studying the physical and chemical rules of La 2O 3-SrO 2-Mn-KMnO 4 system during the heating process, it can be concluded that the La 1-xSr xMnO 3-δ phase has been formed at 600 ℃ by explaining the relation between combustion temperature and combustion velocity with diffuse mechanism of kinetics and the influence of dilution on combustion temperature and combustion velocity. It is obvious that with the reduction of y, combustion velocity reaches its maximum and combustion temperature gradually increases when the temperature amount to 1 473 K and the tendency is slow. In addition with the increase of dilution, combustion velocity and combustion temperature decreases for both.更多还原