La_(1-x)Ca_xMnO_3纳米单晶丝的制备及磁热效应研究  

Preparation and Magnetocaloric Effect of La_(1-x)Ca_xMnO_3 Nanowires

作　　者：王正德[1] 赵辉荣[2] 赵文广[2] 任永刚 李解[2] 邱巨峰[4] 李保卫 

机构地区：[1]内蒙古科技大学化学与化工学院,内蒙古包头014010 [2]内蒙古科技大学材料科学与工程学院,内蒙古包头014010 [3]二零二厂冶金研究所,内蒙古包头014030 [4]包头稀土研究院,内蒙古包头014010

出　　处：《稀土》2005年第1期73-74,共2页Chinese Rare Earths

基　　金：内蒙古自然科学基金资助(20010902-15)

摘　　要：采用化学共沉淀法和热处理的方法制备了La1-xCaxMnO3(x=0.3,0.4,0.5)系钙钛矿型氧化物(LCMO),经XRD确定样品为钙钛矿型结构。TEM分析表明样品直径约为40nm的枝节状纳米丝,用△Tad-T测量仪测量了△Tad-T。与块状样品相比居里温度的波峰变宽,绝热磁温变降低。Nanowire samples La_(1-x)Ca_xMnO_3(x=0.3,0.4,0.5) were prepared by co-precipitation method. XRD patterns showed that the samples after annealing are single perovskite-type phase. TEM photograph indicated that the average size of nanowire is 40 nm.The magnetocaloric effect of samples was measured directly.The result showed that △T is widen and decreased compared to the bulk samples of La_(1-x)Ca_xMnO_3.

关 键 词：化学共沉淀 纳米丝 磁热效应 

分 类 号：TG132.27[一般工业技术—材料科学与工程] O614.33[金属学及工艺—合金]