Nanostructure-induced hydrogenation of layered compound MgB2

Hai Wen Li, Tomoya Matsunaga, Yigang Yan, Hideki Maekawa, Mamoru Ishikiriyama, Shin Ichi Orimo

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

We investigated the hydrogenation properties of layered compound MgB 2 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(BH 4)2 comprising [BH4]- anions with B-H covalent bonds.

Original languageEnglish
Pages (from-to)654-656
Number of pages3
JournalJournal of Alloys and Compounds
Volume505
Issue number2
DOIs
Publication statusPublished - 2010 Sep 3

Keywords

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

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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