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首页> 外文会议>Conference exhibition of the European Ceramic Society >LaMeO{sub}3 perovskite-type ceramic powders obtained by the polymerizable complex method
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LaMeO{sub}3 perovskite-type ceramic powders obtained by the polymerizable complex method

机译：Lameo {Sub} 3通过可聚合复合方法获得的Perovskite型陶瓷粉末

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Lot of studies are devoted to the properties of perovskite type solid solutions, with formula LaMeO{sub}3, Me-transition metal. The oxides based on rare earth and 3 d transition elements were found to be promising materials for use as electrodes, catalysts or membranes. Investigations are carried out to find appropriate compositions with the best necessary properties. Here we report the preparation and characterization of LaMeO{sub}3 perovskite-type oxides in the series of lanthanum manganate LaMnO{sub}3 and cobaltite LaCoO{sub}3. It is necessary to prepare high quality powders with controlled stoichiometry and microstructure, therefore an important feature of our investigation is the preparation method. The powders are obtained by a simple technique as the polymerizable complex method based on the Pechini-type reaction route. A mixed solution of citric acid (CA) and ethylene glycol (EG) with La and Mn or Co ions is polymerized. The CA-metal complexes can be polymerized by EG, as the polymerization reaction induced by EG greatly inhibits cation segregation. An important purpose is the reaction chemistry of the polymerized complex route for the LaMnO{sub}3 and LaCoO{sub}3 synthesis, a key issue being to control the complex formation and polymerization in La-Mn and La-Co solutions and the crystallization behaviour of solid precursors at different heat treatments. The structure of the obtained compounds is investigated by X-ray diffraction (XRD). The microstructure and the grain size distribution are investigated by scanning electron microscopy (SEM); BET method is used for the determination of the specific surface area. Very fine, homogenous, narrow grain size distribution of particles were obtained after only treatment for 6 hours at temperature as low as 600°C for LaCoO{sub}3 and 700°C for LaMnO{sub}3.
机译：许多研究致力于Perovskite型固溶体的性质，用式Lameo {Sub} 3，ME-过渡金属。发现基于稀土和3d过渡元件的氧化物是有前途的材料，用于用作电极，催化剂或膜。进行调查以找到具有最佳必要性的适当组合物。在这里，我们报告了镧锰兰诺{Sub} 3和Cobaltite Lavoo {Sub} 3中Lameo {Sub} 3钙钛矿型氧化物的制备和表征。必须制备具有受控化学计量和微观结构的高质量粉末，因此我们调查的重要特征是制备方法。粉末通过简单的技术作为基于Pechini型反应途径的可聚合复合方法获得的。将柠檬酸（CA）和乙二醇（例如）用La和Mn或Co离子的混合溶液聚合。可以通过例如通过例如极大地抑制阳离子偏析诱导的聚合反应来聚合Ca-金属配合物。一个重要的目的是LAMNO {SUB} 3和LACOO {SUB} 3合成的聚合复合途径的反应化学，一种关键问题是控制LA-MN和LA-CO溶液中的复杂形成和聚合和结晶不同热处理中固体前兆的行为。通过X射线衍射（XRD）研究所得化合物的结构。通过扫描电子显微镜（SEM）研究微观结构和晶粒尺寸分布; BET方法用于确定特定表面积。在低至60℃的温度下仅在600℃下处理6小时后，获得非常精细，均匀，颗粒的颗粒尺寸分布，对于LANNO {SUB} 3，得到60℃。

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