Variation in the ratio of Mg2Co and MgCo2 in amorphous-like mechanically alloyed MgxCo100–x using atomic pair distribution function analysis

Hyunjeong Kim; Jin Nakamura; Huaiyu Shao; Yumiko Nakamura; Etsuo Akiba; Karena W. Chapman; Peter J. Chupas; Thomas Proffen

doi:10.1524/zkri.2012.1496

Published by De Gruyter (O) January 31, 2012

Variation in the ratio of Mg₂Co and MgCo₂ in amorphous-like mechanically alloyed Mg_xCo_100–x using atomic pair distribution function analysis

Hyunjeong Kim , Jin Nakamura , Huaiyu Shao , Yumiko Nakamura , Etsuo Akiba , Karena W. Chapman , Peter J. Chupas and Thomas Proffen

From the journal Zeitschrift für Kristallographie - Crystalline Materials

https://doi.org/10.1524/zkri.2012.1496

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Abstract

Mg₂Co- and MgCo₂-like local atomic arrangements in mechanically alloyed Mg_xCo_100–x were investigated using atomic pair distribution function (PDF) analysis derived from synchrotron X-ray total scattering data. We show that changes in Mg_xCo_100–x PDFs with x are well explained by the structural features of Mg₂Co and MgCo₂. This strongly supports our two-phase model picture where Mg₂Co-like phase continuously increases while MgCo₂ decreases with increasing Mg content in Mg_xCo_100–x.

Keywords: Hydrogen Storage Materials; Mechanical Alloying; Amorphous Materials; Local Structure; Atomic Pair Distribution Function

^* Correspondence address: National Institute of Advanced Industrial Science and Technology, Energy Technology Research Institute, 305-8565 Tsukuba, Ibaraki, Japan, hj.kim@aist.go.jp

Published Online: 2012-01-31

Published in Print: 2012-05

Variation in the ratio of Mg₂Co and MgCo₂ in amorphous-like mechanically alloyed Mg_xCo_100–x using atomic pair distribution function analysis

Abstract

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