Investigation of cobalt-iron alloy nanoparticles in silica matrix by X-ray diffraction and Mossbauer spectroscopy

被引:14
作者
Concas, G
Congiu, F
Ennas, G
Piccaluga, G
Spano, G
机构
[1] Univ Cagliari, Inst Nazl Fis Mat, Dipartimento Fis, I-09042 Monserrato, Cagliari, Italy
[2] Univ Cagliari, Dipartimento Sci Chim, I-09042 Monserrato, Cagliari, Italy
关键词
D O I
10.1016/S0022-3093(03)00529-5
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Nanocrystals of Co100-xFex with different nominal iron content (x = 50, 70, 100) embedded in amorphous silica matrix were prepared by the sol-gel method and thermal treatment in hydrogen atmosphere. Different salts (acetates and nitrates) were used as metal precursors. The samples were characterized by X-ray diffraction and Mossbauer spectroscopy in order to verify the formation of the Fe-Co alloy and investigate its structure and composition. XRD patterns only for acetate samples exhibit peaks belonging to a body centered cubic phase, expected for the Fe-Co alloy at the investigated compositions, and also the lattice parameter values confirm the alloy formation. The average particle size obtained by the Warren-Averbach analysis turned out 9.6(5) nm. In agreement with these results, Mossbauer spectra show the formation of an ordered component with isomer shift and hyperfine fields typical of the Fe-Co alloy only for acetate samples. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码:234 / 241
页数:8
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