摘要
在水/司班-80/正丁醇/正庚烷组成的微乳液系统中,用KBH4还原相应的金属离子成功地制备了Fe-Co-Ni合金纳米质点.Fe-Co-Ni合金和复合物纳米微粒的晶体结构、相变性质用X射线衍射(XRD)、热重分析(TG)和示差扫描量热仪(DSC)作了考察.过程参数对合金和复合物组成、相变以及形态特征的影响用透射电子显微镜(TEM)、X射线能量散射谱(EDS)、原子力显微镜(AFM)和电子衍射(ED)进行了分析,结果表明Fe-Co-Ni的合金化将形成三元金属复合物纳米结构.合金的磁性质用环形AC磁场作了研究.结果表明,Fe-Co-Ni合金和三元金属复合物纳米质点当其在150～400℃退火后,呈现松针和山丘状,其长度和直径分别为150 nm和20～30 nm.磁感应性随煅烧温度的增加而降低;在所有的热分析实验中检测到几个放热过程对应于无定形合金的晶化.对形成Fe-Co-Ni合金和金属复合物的可能机理作了讨论.
A well-mixed Fe-Co-Ni alloy and composite nanoparticles were successfully prepared by chem- ical reduction of the corresponding metal ions with KBH4 in the microemulsion system of water/Span-80/ n-butanol/n-heptane. Crystalline structure, phase transformation properties of the synthesized materials were investigated using X-ray diffraction （XRD）, thermogravimetry （TG） and differential scanning calo- rimeter （DSC）. Effects of the processing parameters on the alloying composition, phase transformation and moqohologic character were analyzed by using a combination of transmission electron microscope （TEM）, energy dispersive X-ray spectrometry （EDS）, atomic force microscope （AFM）, and electron diffraction （ED） , which suggest the Fe-Co-Ni alloying will form a structure in the ternary metal compos- ite nanoparticles. The magnetic property was investigated by using toric AC magnetic field. The results indicated that the configurations of Fe-Co-Ni alloys and composite are pine needle and hummock shapes and Fe-Co-Ni nanopartieles are 150 nm in length and 20--30 nm in diameter, annealed at 150--400℃ respectively. The susceptibilities decreased with the increase of the calcining heat. In all heating experiments several exothermic processes were detected that are related to the crystallization of the amorphouslike alloy and composite. The possible formation mechanism of Fe-Ni-Co alloy and composite nanoparti- cles was discussed.
出处
《纳米技术与精密工程》
EI
CAS
CSCD
2012年第1期36-45,共10页
Nanotechnology and Precision Engineering
基金
贵州省省长基金资助项目(2008(101))
