The influence of cobalt population on the structural properties of CoxFe3-xO4

被引：88
作者：
Nakagomi, F.
da Silva, S. W. [1 ]
Garg, V. K.
Oliveira, A. C.
Morais, P. C.
Franco Junior, A.
Lima, E. C. D.
机构：
[1] Univ Brasilia, Inst Fis, BR-70910900 Brasilia, DF, Brazil
[2] Univ Cattolica Goias, Dept Matemat & Fis, BR-74605010 Goiania, Go, Brazil
[3] Univ Fed Goias, Inst Quim, BR-74001970 Goiania, Go, Brazil
来源：
JOURNAL OF APPLIED PHYSICS | 2007年 / 101卷 / 09期
关键词：
D O I：
10.1063/1.2712821
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
CoxFe3-xO4-based (x=0.05-1.6) nanoparticles prepared by combustion reaction were investigated using x-ray diffraction, Raman spectroscopy, and Mossbauer spectroscopy. The Mossbauer data revealed Co2+ in both tetrahedral (site A) and octahedral (site B) sites of the cubic ferrite structure. For x <= 0.4 the experimental data indicated the synthesis of a core-shell structure, with hematite as the shell and cobalt ferrite as the core of the nanoparticle. Differences in crystalline structure between the two phases support the evidences we found of a highly stressed core-shell interface, leading to symmetry reduction of the tetrahedral and octahedral sites. (c) 2007 American Institute of Physics.
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页数：3
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