快淬工艺对Mg2Ni型合金气态及电化学贮氢动力学的影响

以聚苯乙烯胶体晶体为模板,通过调制溅射功率和溅射时间制备了相同厚度、不同孔间距的Co有序大孔阵列.利用扫描电子显微镜(SEM)、原子力显微镜(AFM)、X射线衍射(XRD)和振动样品磁强计(VSM)考察了样品的结构和磁学特性.发现Co有序大孔阵列的矫顽力和剩磁比最大达到175.02×10-4 T和0.76,分别为Co薄膜的2.2倍和2.5倍,并且随孔间距的增大逐渐降低.结合理论分析结果表明,Co有序大孔阵列本身的形状各向异性是其取得优良磁学性能的原因,孔洞形状各向异性和薄膜本身磁晶各向异性的竞争机制是造成其磁性发生变化的物理本质.

Influence of Melt Spinning on Gaseous and Electrochemical Hydrogen Storage Kinetics of Mg2Ni-type Alloys

Co ordered macroporous arrays with different microgrid spacing and the same thickness were prepared via sputtering Co into the gaps of PS colloidal crystal templates by adjusting sputtering power and sputtering time. The structure and magnetic properties of the Co ordered macroporous arrays were characterized by SEM, AFM, XRD and VSM, respectively. Results show that the coercivity and remanence ratio of the Co ordered macroporous arrays are up to 175.02 × 10-4 T and 0.76, which are 2.2 and 2.5 times of those of Co films, respectively. Moreover, with the increase of the microgrid spacing, the coercivity and the remanence ratio decrease gradually. The results of theoretical analysis indicate that the excellent magnetic characteristics come from the shape anisotropies induced by the structure itself, and the competition between the shape anisotropies and the magnetocrystalline anisotropy results in the change of the magnetic properties