Nanocrystalline FexNi1−x (x ≤ 0.65) alloys formed by chemical synthesis
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- 作者：Lima ; Enio ; Drago ; Valderes ; Cardoso de Lima ; Jo??o ; Papaleo Fichtner ; Paulo Fernando
- 关键词：Nanostructures ; Chemical synthesis ; X-ray and γ ; -ray spectroscopies ; Transmission electron microscopy
- 刊名：Journal of Alloys and Compounds
- 出版年：2005
- 出版时间：June 21, 2005
- 年：2005
- 卷：396
- 期：1-2
- 页码：10-17
- 全文大小：315 K
文摘
Nanocrystalline FexNi1−x alloys (x = 0.15, 0.20, 0.22, 0.25, 0.30, 0.50 and 0.65) were produced by a wet chemical method. The metal concentration ratios in the solutions were preserved in the precipitated powder alloys and no metal segregation was detected. The FCC phase was observed from x = 0.15 to 0.50. For x = 0.65 both FCC and BCC phases were observed. The materials obtained consist of nanoparticles with a mean diameter of 90 nm. The latter are composed of several nanocrystallites surrounded by a low density structurally disordered region. The crystallite size in the FCC phase increased as the at. % Fe decreased from ![]()
der=0>10 nm for x = 0.50 to ![]()
der=0>20 nm for x = 0.15. A different thermal behavior was observed for the x = 0.50 in comparison to the x = 0.22 sample.