Particle size dependence in thermal disorder/order transformation of FeCo alloy

1st Conference on Light and Particle Beams in Materials Science 2013

物理学;材料科学

Shinoda, K.^1 ; Fujieda, S.^1 ; Suzuki, S.^1

Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan^1

关键词: Atomic arrangement;    Crystalline lattice;    Different particle sizes;    Dispersion effect;    Lattice distortions;    Onset temperature;    Particle size dependence;    Synchrotron radiation source;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/502/1/012025/pdf
DOI  :  10.1088/1742-6596/502/1/012025

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

FeCo alloy particles synthesized by liquid phase reduction are disorder distribution of the alloying elements in bcc crystalline lattice. The particle size dependence of thermally ordering behavior during heating was investigated. Superlattice lines such indices as 100, 111 etc., which appear in the x-ray diffraction pattern when the atomic arrangement is ordered, are difficult to detect due to quite small difference between Fe and Co in the atomic x-ray scattering factor. In this study, the energy near to Fe K absorption edge for incident x-ray was used in order to apply the anomalous x-ray dispersion effect. From results of the in situ heated x-ray diffraction experiments using the Synchrotron radiation source, different ordering-onset temperature was observed for the two samples with different particle size. This is considered due to a difference on the lattice distortion and its elimination during heating.