摘要
The long and short range order of chemically prepared Co 2 FeGa Heusler nanoparticles with various sizes are determined by x-ray diffraction (XRD) and extended x-ray absorption fine structure (EXAFS) spectroscopy. Specifically, EXAFS fittings reveal the size dependent crystal structure and short range order of the Heusler type Co 2 FeGa nanoparticles. With decreasing particle size, the degree of L 21 order in the nanoparticles decreases and the probability of B2 disorder increases simultaneously. The consequences of antisite disorder on the size correlated structure of Co 2 FeGa nanoparticles are also discussed. © 2010 American Institute of Physics.