NANOCRYSTALLINE ALPHA-FE, FE3C, AND FE7C3 PRODUCED BY CO2-LASER PYROLYSIS

被引：131
|
作者：
BI, XX
GANGULY, B
HUFFMAN, GP
HUGGINS, FE
ENDO, M
EKLUND, PC
机构：
[1] UNIV KENTUCKY,DEPT PHYS & ASTRON,LEXINGTON,KY 40506
[2] UNIV KENTUCKY,DEPT MAT SCI & ENGN,LEXINGTON,KY 40506
[3] SHINSHU UNIV,DEPT ELECT ENGN,NAGANO 380,JAPAN
来源：
JOURNAL OF MATERIALS RESEARCH | 1993年 / 8卷 / 07期
基金：
美国能源部;
关键词：
D O I：
10.1557/JMR.1993.1666
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Nanocrystalline alpha-Fe, Fe3C, and Fe7C3, particles with narrow size distributions were produced by CO2 laser pyrolysis of vapor,mixtures of Fe(CO)5 and C2H4. Details of the synthesis procedure are discussed. Mossbauer spectroscopy and x-ray diffraction were used to identify the structural phases and the former was used also to study the magnetism of the nanoparticles. All the nanoparticles were observed to be ferromagnetic in this size range. If excess C2H4 appears in the reactant gas mixture, several monolayers of pyrolytic carbon were observed to form on the particle surface, as deduced from transmission electron microscopy and Raman scattering studies. Results of thermo-gravimetric analysis/mass spectroscopy studies of this carbon coating indicate it is gasified in hydrogen at temperatures T approximately 250-degrees-C.
引用
收藏
页码：1666 / 1674
页数：9
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