摘要
以Na2EDTA为模板导向剂,利用水热法成功合成了单晶CeVO4纳米棒,使用X射线衍射仪(XRD)、透射电镜(TEM)、高分辨透射电镜(HRTEM)和超导量子磁强计(SQUID)等对产物的结构和磁学性能进行了表征。结果表明,产物为CeVO4纳米棒,其长度为600nm左右,直径为80nm左右。研究发现,模板剂Na2EDTA和生长溶液的pH值决定着CeVO4纳米晶体的形貌与生长机制。进一步对CeVO4纳米棒的磁性进行研究,表明在低温下,由于受到CeVO4纳米晶体的尺寸效应和Ce离子4f电子的影响,CeVO4纳米晶体表现出明显的超顺磁性,而强烈的一维各向异性和Eu3+掺杂则显著提高了CeVO4纳米棒的磁性能。
Single-crystalline cerium orthovanadate(CeVO4 ) nanorods are synthesized successfully by Na2EDTA- assisted hydrothermal method. The products are characterized using X-ray diffraction(XRD), transmission electron microscopy(TEM), high-resolution transmission electron microscopy(HRTEM) and superconducting quantum interference device (SQUID). The results indicate that the majority of products are CeVO4 nanorods with length of about 600nm and diameter of about 80nm. It is found that Na2 EDTA and pH value of precursor solution play an important role in determining the morphologies and growth process of CeVO4 products. Furthermore, the magnetism of CeVO4 nanorods is characterized. CeVO4 nanocrystals exhibit the noticeable superparamagnetism at low temperature because of the size effects of CeVO4 nanocrystals and 4f electron of cerium. And this strong one-dimension anisotropy and the Eu^3+ doping improves the magnetic performances remarkably.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2009年第10期23-26,共4页
Materials Reports
基金
国家自然科学基金项目(50672071
50672072)
重庆交通大学高层次人才科研启动项目(100676)
关键词
CeVO4
纳米棒
水热法
超顺磁性
cerium orthovanadate, nanorods, hydrothermalmethod, superparamagnetism
作者简介
王念:男,1977年生,博士,讲师,研究方向:纳米功能材料E-mail:wangnianwh@yahoo.com.cn