High pressure synthesis of novel Li-TM hydrides (TM = Nb, Ta)

Atsunori Kamegawa, Riki Kataoka, Masuo Okadaa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

High-pressure synthesis has been widely used for exploration of novel materials. In this study, new Li-based hydrides in Li-Nb and Li-Ta systems have been successfully synthesized under GPa-order by using a cubic-anvil-type apparatus. And crystal structures, thermal stabilities of novel hydrides were investigated. For Li-Nb-H system, novel hydride with primitive hexagonal structure was synthesized at 973 K under 5 GPa. Its lattice parameter was a = 0.56250(5) nm, c = 0.57416(4) nm. A structural model of the hydride was CaCu5-type structure (P6/mmm, No. 191). For Li-Ta system, novel hydride with C-face centered monoclinic structure was obtained at 973 K under 5 GPa. Its lattice parameter was a = 0.7918(5) nm, b = 0.8012(4) nm, c = 1.030(7) nm, β = 111.27 (6)°. These novel hydrides in Li-Nb and Li-Ta systems were decomposed at 510 K and 573 K, respectively, and these values were about 400 K lower than that of LiH (>953 K).

Original languageEnglish
Title of host publicationWHEC 2012 Conference Proceedings - 19th World Hydrogen Energy Conference
PublisherElsevier Ltd
Pages276-282
Number of pages7
ISBN (Print)9781627483179
DOIs
Publication statusPublished - 2012
Event19th World Hydrogen Energy Conference, WHEC 2012 - Toronto, ON, Canada
Duration: 2012 Jun 32012 Jun 7

Publication series

NameEnergy Procedia
Volume29
ISSN (Print)1876-6102

Other

Other19th World Hydrogen Energy Conference, WHEC 2012
CountryCanada
CityToronto, ON
Period12/6/312/6/7

Keywords

  • High pressure synthesis
  • Li-Nb-h
  • Li-Ta-H
  • Lithium
  • New hydride
  • X-ray diffraction

ASJC Scopus subject areas

  • Energy(all)

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