Decomposition of magnesium hydride fiber observed using TEM and in-situ AFM

Itoko Matsumoto, Junko Matsuda, Yumiko Nakamura, Etsuo Akiba

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The thermodynamics and the decomposition behavior of an MgH2 fiber of a single crystal synthesized by chemical vapor deposition were investigated using in-situ atomic force microscopy and transmission electron microscopy. The MgH2 fiber without oxidation decomposed into polycrystalline Mg with a crystalline size of 20-50 nm. The polyciystalline Mg absorbed hydrogen at a pressure similar to the equilibrium pressure of bulk Mg. On the other hand, the MgH2 fiber with surface oxidation decomposed into Mg crystals larger than 100 nm. The surface oxide layer affected the decomposition behavior of the MgH2 fiber and prevented polycrystallization. These results suggest that surface oxidation increases the equilibrium pressure for hydrogen absorption of the MgH2 fiber.

Original languageEnglish
Pages (from-to)481-485
Number of pages5
JournalMaterials Transactions
Volume52
Issue number3
DOIs
Publication statusPublished - Mar 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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