Bulk nanocrystalline gamma magnesium hydride with low dehydrogenation temperature stabilized by plastic straining via high-pressure torsion

Kaveh Edalati, Kouki Kitabayashi, Yuji Ikeda, Junko Matsuda, Haiwen Li, Isao Tanaka, Etsuo Akiba, Zenji Horita

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

MgH2 with the α tetragonal structure was plastically strained using the high-pressure torsion (HPT) method and fully transformed to a nanonocrystalline γ orthorhombic phase with increasing the strain. The formation of nanocrystalline high-pressure γ phase resulted in decreasing the dehydrogenation temperature by 80 K. First-principles phonon calculations showed that both α and γ phases are dynamically stable, but the γ phase with the ionic binding has weaker hydrogen binding energy and accordingly lower dehydrogenation temperature. This study confirms the significance of crystal structure on thermal stability of hydrides for hydrogen storage applications.

Original languageEnglish
Pages (from-to)54-57
Number of pages4
JournalScripta Materialia
Volume157
DOIs
Publication statusPublished - Dec 1 2018

Fingerprint

Dehydrogenation
dehydrogenation
Hydrides
Torsional stress
Magnesium
hydrides
torsion
magnesium
plastics
Plastics
Hydrogen storage
hydrogen
Binding energy
Hydrogen
Thermodynamic stability
thermal stability
Crystal structure
binding energy
Temperature
crystal structure

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Bulk nanocrystalline gamma magnesium hydride with low dehydrogenation temperature stabilized by plastic straining via high-pressure torsion. / Edalati, Kaveh; Kitabayashi, Kouki; Ikeda, Yuji; Matsuda, Junko; Li, Haiwen; Tanaka, Isao; Akiba, Etsuo; Horita, Zenji.

In: Scripta Materialia, Vol. 157, 01.12.2018, p. 54-57.

Research output: Contribution to journalArticle

@article{f98794bf7bb5429dbbb84562f1541759,
title = "Bulk nanocrystalline gamma magnesium hydride with low dehydrogenation temperature stabilized by plastic straining via high-pressure torsion",
abstract = "MgH2 with the α tetragonal structure was plastically strained using the high-pressure torsion (HPT) method and fully transformed to a nanonocrystalline γ orthorhombic phase with increasing the strain. The formation of nanocrystalline high-pressure γ phase resulted in decreasing the dehydrogenation temperature by 80 K. First-principles phonon calculations showed that both α and γ phases are dynamically stable, but the γ phase with the ionic binding has weaker hydrogen binding energy and accordingly lower dehydrogenation temperature. This study confirms the significance of crystal structure on thermal stability of hydrides for hydrogen storage applications.",
author = "Kaveh Edalati and Kouki Kitabayashi and Yuji Ikeda and Junko Matsuda and Haiwen Li and Isao Tanaka and Etsuo Akiba and Zenji Horita",
year = "2018",
month = "12",
day = "1",
doi = "10.1016/j.scriptamat.2018.07.043",
language = "English",
volume = "157",
pages = "54--57",
journal = "Scripta Materialia",
issn = "1359-6462",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Bulk nanocrystalline gamma magnesium hydride with low dehydrogenation temperature stabilized by plastic straining via high-pressure torsion

AU - Edalati, Kaveh

AU - Kitabayashi, Kouki

AU - Ikeda, Yuji

AU - Matsuda, Junko

AU - Li, Haiwen

AU - Tanaka, Isao

AU - Akiba, Etsuo

AU - Horita, Zenji

PY - 2018/12/1

Y1 - 2018/12/1

N2 - MgH2 with the α tetragonal structure was plastically strained using the high-pressure torsion (HPT) method and fully transformed to a nanonocrystalline γ orthorhombic phase with increasing the strain. The formation of nanocrystalline high-pressure γ phase resulted in decreasing the dehydrogenation temperature by 80 K. First-principles phonon calculations showed that both α and γ phases are dynamically stable, but the γ phase with the ionic binding has weaker hydrogen binding energy and accordingly lower dehydrogenation temperature. This study confirms the significance of crystal structure on thermal stability of hydrides for hydrogen storage applications.

AB - MgH2 with the α tetragonal structure was plastically strained using the high-pressure torsion (HPT) method and fully transformed to a nanonocrystalline γ orthorhombic phase with increasing the strain. The formation of nanocrystalline high-pressure γ phase resulted in decreasing the dehydrogenation temperature by 80 K. First-principles phonon calculations showed that both α and γ phases are dynamically stable, but the γ phase with the ionic binding has weaker hydrogen binding energy and accordingly lower dehydrogenation temperature. This study confirms the significance of crystal structure on thermal stability of hydrides for hydrogen storage applications.

UR - http://www.scopus.com/inward/record.url?scp=85050851260&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85050851260&partnerID=8YFLogxK

U2 - 10.1016/j.scriptamat.2018.07.043

DO - 10.1016/j.scriptamat.2018.07.043

M3 - Article

VL - 157

SP - 54

EP - 57

JO - Scripta Materialia

JF - Scripta Materialia

SN - 1359-6462

ER -