Provided is a method for producing magnesium hydride, the method including a plasma treatment step of exposing a raw material mixture of at least one magnesium-based raw material selected from the group consisting of magnesium, magnesium hydroxide, and magnesium oxide and magnesium hydride to hydrogen plasma.

Provided is an integrated device for preparing magnesium hydride powder and a method for preparing magnesium hydride powder. The device comprises a heating chamber for heating a magnesium-based metal material to produce metal droplets; a powder-making chamber comprising an atomizing means used for atomizing the metal droplets which are then cooled to form a metal powder; and a reaction chamber used for performing a hydrogenation reaction on the metal powder to form the magnesium hydride powder. The device is an integrated structure monolithic with a simple structure and a convenient operation; and the entire process of preparing magnesium hydride powder can be completed in this single device and can realize automated control. The preparation method is simple and easy to operate and produces a product that has a moderate size, uniform particles, and excellent performance.

Provided is an integrated device for preparing magnesium hydride powder and a method for preparing magnesium hydride powder. The device comprises a heating chamber for heating a magnesium-based metal material to produce metal droplets; a powder-making chamber comprising an atomizing means used for atomizing the metal droplets which are then cooled to form a metal powder; and a reaction chamber used for performing a hydrogenation reaction on the metal powder to form the magnesium hydride powder. The device is an integrated structure monolithic with a simple structure and a convenient operation; and the entire process of preparing magnesium hydride powder can be completed in this single device and can realize automated control. The preparation method is simple and easy to operate and produces a product that has a moderate size, uniform particles, and excellent performance.

Provided is a method for producing magnesium hydride, the method including a plasma treatment step of exposing a raw material mixture of at least one magnesium-based raw material selected from the group consisting of magnesium, magnesium hydroxide, and magnesium oxide and magnesium hydride to hydrogen plasma.

Rare earth (RE) superhydrides exhibit high temperature superconductivity but are difficult to characterize and use in applications due to their high formation and stability pressures, which are typically in excess of 100 GPa. Cryomilling of metal precursors improves hydrogen reactivity and hydrogen uptake for forming such metal hydrides at lower pressures. As an example, an elemental lanthanum precursor was milled at liquid nitrogen temperatures for different time intervals. After exposure to gaseous hydrogen at 380? C. and 100 bar, a systematic enhancement of hydrogen absorption with increasing ball milling time was found for forming the LaH.sub.x, x=2-3 phase. Exposing the La precursor to pressures up to 60 GPa with an ammonia borane (BNH.sub.6) hydrogen source resulted in a hypervalent LaH.sub.4 phase. This LaH.sub.4 phase is associated with the suppression of a rhombohedral distortion of the Fm3m cubic structure after cryomilling the precursor.

A system including a material is described. The material includes at least one rare earth (R), hydrogen (H), and at least one dopant (D). The material includes R, H, and D with R:H:D in a ratio of 1:x:y, where x is greater than 2 and less than 3, and y is at least 0.4 and less than 1.