Journal Article Hysteresis phenomena on the crystal lattice of Ti0.8Zr0.2Mn1.5 in the hydrognation and dehydrogenatuion process

Noritake, Tatsuo  ,  Aoki, Masakazu  ,  Shin-ichi, Towata  ,  Machida, Akihiko  ,  Watanuki, Tetsu

42 ( 26 )  , pp.16667 - 16674 , 2017-06 , Elsevier
The structural changes in the hydrogenation and dehydrogenation reaction process on Ti0.8Zr0.2Mn1.5 alloy have been investigated by the in-situ synchrotron radiation X-ray diffraction experiments to elucidate the mechanism of hysteresis phenomena in equilibrium hydrogen pressure.The lattice constant and unitcell volume of both hydrogen solid solution phase and hydride phase in the dehydrogenation pricess are smaller than those in hydrogenation process despite of lower equilibrium pressure. This result is opposite to the general relation between the lattice volume and pressure. The hysteresis behavior also exhibits in the diffraction peak width. The hysteresis behavior may be related to lattice difects and hydrogen concentration.

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