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Crystal Structure Evolution of La2Ni7 during Hydrogenation

Published online by Cambridge University Press:  21 February 2013

Yuki Iwatake
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
Kyosuke Kishida
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
Haruyuki Inui
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
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Abstract

Atomic scale characterization of the La2Ni7 hydrides by high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) revealed that not only the anisotropic expansion of the La2Ni4 unit layer previously reported but also the shearing on the basal plane of the La2Ni4 unit layers occur during one-cycle of hydrogen absorption/desorption process. Two different types of orthorhombic La2Ni7 hydrides with the same atomic arrangement of La and different atomic arrangement of Ni were observed depending on the maximum hydrogen concentration achieved during one hydrogen absorption/desorption cycle.

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Articles
Copyright
Copyright © Materials Research Society 2013 

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References

REFERENCES

Yamamoto, T., Inui, H., Yamaguchi, M., Sato, K., Fujitani, S., Yonezu, I., and Nishio, K., Acta Mater., 45, 5213 (1997).CrossRefGoogle Scholar
Buschow, K.H.J. and Van Der Goot, A.S., J. Less-Comm. Met., 22, 419 (1970).CrossRefGoogle Scholar
Oesterreicher, H., Clintonn, J., and Bittner, H., Mater. Res. Bull., 11, 1241 (1976).CrossRefGoogle Scholar
Chung, U.I. and Lee, J.Y., J. Non-Cryst. Solids, 110, 203 (1989).10.1016/0022-3093(89)90259-7CrossRefGoogle Scholar
Yartys, V.A., Riabov, A.B., Denys, R.V., Sato, M., and Delaplane, R.G., J. Alloys Compd., 408412, 273 (2006).CrossRefGoogle Scholar
Iwase, K., Sasaki, K., Nakamura, Y., and Akiba, E., Inorg. Chem., 49, 8763 (2010).10.1021/ic100964jCrossRefGoogle Scholar
Pennycook, S.J., Lupini, A.R., Varela, M., Borisevich, A.Y., Peng, Y., Oxley, M.P. and Chisholm, M.F., in Scanning Transmission Electron Microscopy for Nanostructure Characterization, edited by Zhou, W. and Wang, Z.L., (Springer, New York, 2006) p.152.Google Scholar
Kishida, K. and Browning, N.D., Physica C 351, 281 (2001).CrossRefGoogle Scholar
Buschow, K.H.J., J. Magn. Magn. Mater., 40, 224 (1983).CrossRefGoogle Scholar