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Correlation between structure of titanium additives and dehydrogenation reaction of magnesium borohydride studied by continuous observation of X-ray absorption spectroscopy

Matsumura, Daiju   ; Oyama, Takahiro*; Okajima, Yuka*; Nishihata, Yasuo; Li, H.-W.*; Orimo, Shinichi*

Local structure of Ti-based additives in Mg(BH$$_{4}$$)$$_{2}$$ 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(BH$$_{4}$$)$$_{2}$$. Simultaneous measurement of the dehydrogenation curve and the X-ray absorption spectroscopy by the dispersive optics revealed that a part of TiCl$$_{3}$$ additive is converted to Ti$$_{x}$$Mg$$_{1-3x/2}$$(BH$$_{4}$$)$$_{2}$$ ($$x$$ = 0$$sim$$0.67) just after ball milling mixture and then promptly resolved to TiB$$_{2}$$ at 100-150$$^{circ}$$C with the first dehydrogenation peak. TiO$$_{2}$$ additive is slowly converted to lower oxidation state in wide temperature range around the second dehydrogenation peak at 350$$^{circ}$$C where the main dehydrogenation reaction of Mg(BH$$_{4}$$)$$_{2}$$ occurs.

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Category:Materials Science, Multidisciplinary

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