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Structural and Magnetic Properties of New Zr(Fe0.8Cu0.2)2 and Zr(Fe0.8Cu0.1Co0.1)2 Hydrogen Storage Materials

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Abstract:

In this work we investigate the effect of hydrogen absorption/desorption at room temperature on the structural, magnetic and microstructural characteristics of Zr(Fe0.8Cu0.2)2 and Zr(Fe0.8Co0.1Cu0.1)2. Hydrating kinetics of the as cast bulk samples have been examined while in both samples an anomalous behavior at the absorption part of the P-C curve has been observed. Co doped sample absorbs higher hydrogen content at lower pressure. Crystal structure analysis has been performed by using the Rietveld method. Co free sample has saturation magnetization of 50.85 Am2/kg while Co doped sample has 54.04 Am2/kg at external field of 1.8 T. After hydrogenation the magnetization decreases. Thermomagnetic analysis in the range of 4.2 to 1100 K reveals that the Curie temperature of AB2 phases is in the range of 510 to 550 K. Scanning electron microscopy with energy dispersive x-ray spectroscopy was used in order to examine the composition and surface morphology of the bulk samples. The grain size reduces due to hydrogenation and this is attributed to the more hysteretic magnetization curve.

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Advanced Materials Forum III View Preview

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Periodical:

Materials Science Forum (Volumes 514-516)

Pages:

432-436

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.514-516.432

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Online since:

May 2006

Authors:

Sofoklis S. Makridis, Mary Konstantakou, Th.A. Steriotis, Eleni Pavlidou, K.G. Efthimiadis, M. Daniil, A. Ioannidou, E.S. Kikkinidis, Athanasios K. Stubos

Keywords:

Intermetallic Compound (IMC), Laves Phases, Magnetic Material, Metal Hydride

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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References

[1] G. Sandrock and G. Thomas, Compilation of IEA/DOE/SNL hydride databases, IEA Technical Report (1977), which is available via Web site (http: /hydpark. ca. sandia. gov).

Google Scholar

[2] J.J.G. Willems, K.H.J. Buschow: J. Less-Common Met. Vol. 129 (1987), p.13.

Google Scholar

[3] B.V. Ratnakumar, Jr.C. Witham, R.C. Bowman, A. Hightower, B. Fultz: J. Electrochem. Soc. Vol. 143 (1996), p.2578.

Google Scholar

[4] T. Sakai, T. Hazama, H. Miyamura, N. Kuriyama, A. Kato, H. Ishikawa: J. Less-Common Met. Vol. 172-174 (1991), p.1175.

DOI: 10.1016/s0022-5088(06)80025-1

Google Scholar

[5] H.G. Pan, Y. Chen, C.S. Wang, J.X. Ma, C.P. Chen, Q.D. Wang: Electrochim Acta Vol. 44 (1999), p.2263.

Google Scholar

[6] J.X. Ma, H.G. Pan, Y.F. Zhu, S.Q. Li, C.P. Chen, Q.D. Wang: Electrochim Acta Vol 46 (2001), p.2427.

Google Scholar

[7] E. Justi, H. Ewe, A. Kalberlah, N. Sardakis, M. Schaefer: Energy Convers Vol. 10 (1970), p.183.

Google Scholar

[8] S.R. Ovshinsky, M.A. Fetcenko, J. Ross: Science Vol. 260 (1993), p.176.

Google Scholar

[9] D.L. Sun, Y.Q. Lei, W.H. Liu, J.J. Jiang, J. Wu, Q.D. Wang: J. All. and Comp. Vol. 231 (1995), p.621.

Google Scholar

[10] M. Tsukahara, T. Kamiya, K. Takahashi, A. Kawabata, S. Sakurai, J. Shi, H.T. Takeshita, N. Kuriyama, T. Sakai: J. Electrochem. Soc. Vol. 147 (2000), p.2941.

DOI: 10.1149/1.1393628

Google Scholar

[11] H. Yamada, T. Tohyama and M. Shimizu: J. Magn. Magn. Mat. Vol. 66 (1987) p.413.

Google Scholar