Thermodynamic properties of hydrides of Mg2.0Ni alloy produced by bulk mechanical alloying were determined from the pressure-composition (PC) isotherms over the temperatures from 623 to 423 K. In-situ X-ray diffraction studies indicated the hydride formation is accompanied with structural change of Mg2.0Ni host lattice. The van't Hoff plots for the plateau pressures on isotherms clearly indicated the existence of the structural transformation of the hydride at around 525 K. It is believed that the transformation corresponds to the order/disorder transformation in the hydrogen sublattice. In this paper the difference in the thermodynamic properties between the high and low temperature hydrides will be discussed in relation to the hydrogen order/disorder phenomena presumed by studies on structure of Mg2.0Ni hydrides.
|ジャーナル||Materials Science Forum|
|出版ステータス||Published - 2000 1月 1|
|イベント||Proceedings of the 1st Nagaoka International Workshop on Magnesium Platform Science and Technology 2000 - Nagaoka, Jpn|
継続期間: 2000 7月 27 → 2000 7月 29
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