Structural change and hydrogenation behavior of (Sr, Ca)2Al alloys

The phase structure and hydrogenation behavior of the (Sr1−xCax)2Al (x = 0.5, 0.6, 0.7, 0.8 and 0.9) alloys were investigated. It was found that the (Sr1−xCax)2Al alloys have different phase components with the change of Ca content. When x = 0.6 and 0.7, the single (Sr, Ca)2Al phase can be obtained. The lattice parameters of (Sr, Ca)2Al compound in the (Sr1−xCax)2Al alloys decrease gradually with the increase of Ca content. The (Sr, Ca)2Al phase can absorb hydrogen even at 303 K. During hydrogenation, the (Sr, Ca)2Al compound transforms into distinct phases at different temperatures.