钙钛矿型复合氧化物催化剂中过渡金属离子的状态及其间的相互作用  

Transition Metal Ion States and Their Interactions of Perovskite-type Mixed Oxides LaMyM'_(1-y)O_3

作　　者：刘社田[1] 于作龙[1] 吴越[1] 

机构地区：[1]中国科学院长春应用化学研究所,中国科学院大连化学物理研究所催化重点实验室博士后流动站

出　　处：《无机材料学报》1995年第1期62-68,共7页Journal of Inorganic Materials

基　　金：国家自然科学基金

摘　　要：讨论了Ｂ位二元复合钙钛矿型复合氧化物ＬａＭｙＭ１＇Ｏ３（Ｍ，Ｍ’＝Ｍｎ，Ｆｅ，Ｃｏ；ｙ＝０．０～１．０）中过渡金属离子的状态及其间的相互作用．在Ｍｎ－Ｃｏ复合体系中，富锰区（ｙ＞ｏ．５）Ｍｎ３＋－Ｏ２－－Ｍｎ４＋的铁磁超交换作用对样品的磁性起决定作用．富钴区（ｙ＜０．５）Ｃｏ２＋和ＣｏＩＩＩ离子的存在及其浓度是影响磁性和电导性的主要因素．ｙ＝０．５时样品的结构决定了样品的强铁磁性质．在Ｆｅ－Ｍｎ和Ｆｅ－Ｃｏ体系中Ｆｅ离子的状态的不同主要是由于Ｍｎ、Ｃｏ离子在其周围的分布和氧化还原性质的不同而引起的．The transition metal ion states and their interactions in B-site mired perovskite-type chides LaMyM'1-yO3 (M, M'=Mn, Fe, Co) were discussed. In Mn-Co combined system, the ferromagnetic superexchange interaction of Mn3+-O2--Mn4+ plays a dominant role upon the magnetic property of the Mn-rich samples (y>0.5) and the concentrations of Co2+ and Co3+ in CO-rich samples (y<0.5) is the main factor influencing their magnetic and electronic properties. The strong ferromagnetic property of the sample with a composition of y=0.5 is mainly due to its crystal structure. In Fe-Mn and Fe-Co systems, the variant Fe ion states are mainly due to the distribution of Mn or Co in its neighboring transition metal ion site and the different redox properties of Mn, Fe, Co ions.

关 键 词：钙钛矿 复合氧化物 过渡金属离子 催化剂 

分 类 号：O643.36[理学—物理化学] TQ426.7[理学—化学]