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La-Cu-Mn系钙钛矿型复合氧化物的表面特征
引用本文:兰翠玲,蒙衍强,赵临远,唐献兰.La-Cu-Mn系钙钛矿型复合氧化物的表面特征[J].广西科学,2002,9(4):284-288.
作者姓名:兰翠玲  蒙衍强  赵临远  唐献兰
作者单位:1. 右江民族师范专科学校化学系,百色,533000
2. 柳州两面针股份有限公司,柳州,545001
3. 广西师范大学化学化工系,桂林,541004
摘    要:采用以EDTA为配位剂的Sol-gel法制备La-Mn体系钙钛矿型复合氧化物,借助X射线衍射(XRD),X射线光电子能谱(XPS)等手段对其表面的结构和性质进行表征。结果表明,Cu^2 部分取代A位、B位或同时部分取代A位、B位将导致氧化物特征发生变化,部分取代A位的La^3 比部分取代B位的Mn^3 更有利于锰离子在表面富集,更能提高晶格氧的相对含量和阳离子缺陷的浓度,但对Mn^3 含量的影响程度没有明显差异。

关 键 词:X射线衍射  X射线光电子能谱  Sol-gel法  催化剂  La-Cu-Mn系  钙钛矿型复合氧化物  表面特征
收稿时间:2002/5/21 0:00:00
修稿时间:2002年5月21日

Surface Characterization of La-Cu-Mn Perovskite-type Mixed Oxides
Lan Cuiling,Meng Yanqiang,Zhao Linyuan and Tang Xianlan.Surface Characterization of La-Cu-Mn Perovskite-type Mixed Oxides[J].Guangxi Sciences,2002,9(4):284-288.
Authors:Lan Cuiling  Meng Yanqiang  Zhao Linyuan and Tang Xianlan
Institution:Dept. of Chemistry, Youjiang Teachers College for Nationalities, Baise, Guangxi, 533000, China,Dept. of Chemistry, Youjiang Teachers College for Nationalities, Baise, Guangxi, 533000, China,Dept. of Chemistry, Youjiang Teachers College for Nationalities, Baise, Guangxi, 533000, China and Dept. of Chemistry, Youjiang Teachers College for Nationalities, Baise, Guangxi, 533000, China
Abstract:The La Cu Mn perovskite type mixed oxides were prepared by the Sol gel method using EDTA as complex agent,and characterized by X ray diffraction(XRD) and X ray photoelection spectroscopy(XPS).The XPS analysis reveals the characteristic changes resulting from the A site substitutions,B site substitutions or both substitutions of Cu in LaMnO 3.A site substitutions for La 3+ is more beneficial to enhance the content of manganese ion on the surface,the relative value of lattice oxygen and the concentration of ion defect than B site substitutions for Mn 3+ .But there is no marked difference in influence on Mn 4+ .
Keywords:perovskite  complex oxide  X  ray diffraction(XRD)  X  ray photoelection spectroscopy(XPS)
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