Synthesis and crystal structure of new hydrides in Mg-RE systems under high-pressure (RE = La, Ce, Pr)

Yasuyuki Goto, Hirofumi Kakuta, Atsunori Kamegawa, Hitoshi Takamura, Masuo Okada

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)

Abstract

The high-pressure synthesis of new hydrides of Mg-RE-H systems, where RE = La, Ce and Pr, were conducted by using a cubic-anvil-type apparatus, and their crystal structure, thermal stabilities and hydrogen contents were investigated. In MgH2-xmol%REH (REH = LaH3, CeH2.5 and PrH3), new hydrides with primitive tetragonal structure were synthesized around x = 25 - 33 under GPa-order high pressures. The lattice constants were a = 0.8193 nm, c = 0.5028 nm, a - 0.8118 nm, c = 0.4979 nm and a = 0.8058 nm, c= 0.4970 nm at x = 25 in Mg-La, Ce and Pr systems, respectively. The hydrogen contents of the novel compounds were 4.1 mass%, 3.7 mass% and 3.9 mass% in Mg-La, Ce and Pr systems, respectively, and the chemical formulas were found to correspond to Mg3LaH9, Mg3CeH 8.1 and Mg3PrH9. The new hydrides decomposed into Mg and rare-earth hydride at about 600 K (Mg3LaH9: 614 K, Mg3CeH8.1: 609 K, Mg3PrH9: 630 K) with an endothermic reaction.

Original languageEnglish
Pages (from-to)2521-2526
Number of pages6
JournalMaterials Science Forum
Volume475-479
Issue numberIII
DOIs
Publication statusPublished - 2005
EventPRICM 5: The Fifth Pacific Rim International Conference on Advanced Materials and Processing - Beijing, China
Duration: 2004 Nov 22004 Nov 5

Keywords

  • High pressure
  • Hydride
  • Magnesium-Cerium system
  • Magnesium-Lanthanum system
  • Magnesium-Praseodymium system
  • Thermal stability

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