Materials Transactions Online

Materials Transactions, Vol.52 No.04 (2011) pp.635-640
© 2011 The Japan Institute of Metals

Correlation between Structure of Titanium Additives and Dehydrogenation Reaction of Magnesium Borohydride Studied by Continuous Observation of X-Ray Absorption Spectroscopy

Daiju Matsumura1, Takahiro Ohyama1, Yuka Okajima1, Yasuo Nishihata1, Hai-Wen Li2 and Shin-ichi Orimo2

1Quantum Beam Research Directorate, Japan Atomic Energy Agency, Hyogo 679-5148, Japan
2Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

Local structure of Ti-based additives in Mg(BH4)2 was studied by X-ray absorption fine structure spectroscopy with conventional and dispersive mode in order to understand the correlation between the structure of the additives and dehydrogenation property of Mg(BH4)2. Simultaneous measurement of the dehydrogenation curve and the X-ray absorption spectroscopy by the dispersive optics revealed that a part of TiCl3 additive is converted to TixMg1-3x/2(BH4)2 (x = 0∼0.67) just after ball milling mixture and then promptly resolved to TiB2 at 100–150°C with the first dehydrogenation peak. TiO2 additive is slowly converted to lower oxidation state in wide temperature range around the second dehydrogenation peak at 350°C where the main dehydrogenation reaction of Mg(BH4)2 occurs.

(Received 2010/10/25; Accepted 2010/12/7; Published 2011/1/26)

Keywords: magnesium borohydride, X-ray absorption fine structure, dehydrogenation reaction, hydrogen, hydride

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