During gas hydrogen absorption/desorption process, YH3 and YH2 hydrides formed at the contacting sites of Pd particles with Y grains under catalysis of Pd.

• 室温气态充氢过程中；在Pd颗粒催化作用下； Y可形成氢化物YH3和YH2；形成氢化物的局部区域发生膨胀开裂.