巨磁电阻材料La_(1-x)Zn_xMnO_3化合物的制备工艺及其结构研究  

Study on Preparation and Structure of Giant Magnetoresistance La_(1-x)Zn_xMnO_3 Compounds

作　　者：罗广圣[1] 刘光华[1] 周正有[1] 甘建萍[1] 欧阳小吕[1] 

机构地区：[1]南昌大学材料科学与工程学院,南昌330031

出　　处：《航空材料学报》2008年第4期46-50,共5页Journal of Aeronautical Materials

基　　金：江西省教育厅科技项目(编号:赣教技字2006-25);南京大学固体微结构国家重点实验室基金项目(M041916)

摘　　要：对巨磁电阻材料La1-xZnxMnO3(x=0.1,0.3,0.5,0.7,0.9,1.0)样品的制备工艺、晶体结构、微观结构进行研究。结果表明,样品ZnO与MnO2固相反应的烧结温度和时间分别大于1300℃和6h时,反应生成具有四面体结构的ZnMnO3化合物;压制成型的压力对结构具有一定影响;不同浓度的Zn2+(x=0.1,0.3,0.5,0.7,0.9)掺杂样品在1350℃烧结12h后,均具有钙钛矿结构,但掺杂浓度在大于x=0.5时有新的衍射峰,产生新的物相,从而影响巨磁电阻效应性能。The preparation and structure of perovskite manganese oxides were studied. When the temperature and sintering time in the solid reaction were above 1300℃ and 6h respectively, ZnO reacted with MnO2 into ZnMnO3 compound with a tetrahedron structure and the influence of molding pressure on structure was studied. The samples La1-xZnxMnO3 with different Zn^2＋ doping content （x = 0.1, 0.3,0.5,0.7,0. 9） were prepared under the temperature 1350℃ and sintering time 12h, however, the other phase was formed when doping content was above 0. 5 and affected giant magnetoresistance property.

关 键 词：钙钛矿氧化物 晶体结构 微观结构 Zn^2+掺杂 

分 类 号：TG115.271[金属学及工艺—物理冶金]