Nanostructure-induced hydrogenation of layered compound MgB2

作者：Li Hai Wen; Matsunaga Tomoya; Yan Yigang; Maekawa Hideki; Ishikiriyama Mamoru; Orimo Shin ichi^*

来源：Journal of Alloys and Compounds, 2010, 505(2): 654-656.

DOI：10.1016/j.jallcom.2010.06.101

• Nanostructured materials
• Hydrogen storage
• Mechanical alloying
• Grain boundary
• Hydrogen
• Hydride

We investigated the hydrogenation properties of layered compound MgB2 mechanically milled under a hydrogen pressure of 1.0 MPa. The total hydrogen concentration after milling for 600 min was approximately 1.0 mass%. No hydrogen insertion into MgB2 interlayer was observed from interlayer distance analysis. On the other hand, mechanical milling generated the nanostructured MgB2 with grain boundary defects in which B-H covalent bond and/or Mg-H bond were assumed to be formed. The nanostructure with grain boundary defects significantly promoted the subsequent high pressure (40.0 MPa) hydrogenation of MgB2 for the synthesis of Mg(BH4)(2) comprising [BH4](-) anions with B-H covalent bonds.

• 出版日期2010-9-3