Variation in the ratio of Mg 2Co and MgCo 2 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; Thomas Proffen

doi:10.1524/zkri.2012.1496

Variation in the ratio of Mg ₂Co and MgCo ₂ 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, Thomas Proffen

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11 Scopus citations

Abstract

Mg ₂Co- and MgCo ₂-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 Mg ₂Co and MgCo ₂. This strongly supports our two-phase model picture where Mg ₂Co-like phase continuously increases while MgCo ₂ decreases with increasing Mg content in Mg _xCo _100-x.

Original language	English
Pages (from-to)	299-303
Number of pages	5
Journal	Zeitschrift fur Kristallographie
Volume	227
Issue number	5
DOIs	https://doi.org/10.1524/zkri.2012.1496
State	Published - May 2012

Funding

Acknowledgements. We thank Kevin Beyer, Katharine Page, and Joan Siewenie for help with the experiments. This work was partly supported by the New Energy and Industrial Technology Development Organization (NEDO) under Advanced Fundamental Research Project on Hydrogen Storage Materials (HYDRO-STAR). HK and TP acknowledge support from the Lujan Neutron Scattering Center, funded by the DOE Office of Basic Energy Sciences. Los Alamos National Laboratory is operated by Los Alamos National Security LLC under Contract DE-AC52–06NA25396. Use of the Advanced Photon Source, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science by Argonne National Laboratory, was supported by the U.S. DOE under Contract No. DE-AC02–06CH11357.

Funders	Funder number
U.S. Department of Energy	DE-AC02–06CH11357
Office of Science
Basic Energy Sciences
Argonne National Laboratory
Los Alamos National Laboratory	DE-AC52–06NA25396
New Energy and Industrial Technology Development Organization

Keywords

Amorphous materials
Atomic pair distribution function
Hydrogen storage materials
Local structure
Mechanical alloying

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1524/zkri.2012.1496

Cite this

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title = "Variation in the ratio of Mg 2Co and MgCo 2 in amorphous-like mechanically alloyed Mg xCo 100-x using atomic pair distribution function analysis",

abstract = "Mg 2Co- and MgCo 2-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 Mg 2Co and MgCo 2. This strongly supports our two-phase model picture where Mg 2Co-like phase continuously increases while MgCo 2 decreases with increasing Mg content in Mg xCo 100-x.",

keywords = "Amorphous materials, Atomic pair distribution function, Hydrogen storage materials, Local structure, Mechanical alloying",

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

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AU - Kim, Hyunjeong

AU - Nakamura, Jin

AU - Shao, Huaiyu

AU - Nakamura, Yumiko

AU - Akiba, Etsuo

AU - Chapman, Karena W.

AU - Chupas, Peter J.

AU - Proffen, Thomas

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AB - Mg 2Co- and MgCo 2-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 Mg 2Co and MgCo 2. This strongly supports our two-phase model picture where Mg 2Co-like phase continuously increases while MgCo 2 decreases with increasing Mg content in Mg xCo 100-x.

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KW - Atomic pair distribution function

KW - Hydrogen storage materials

KW - Local structure

KW - Mechanical alloying

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