Nuclear magnetic resonance wide-line study of hydrogen in the yttrium-yttrium dihydride system

Technical Report · Sat Mar 01 00:00:00 EST 1980

DOI:https://doi.org/10.2172/5624405· OSTI ID:5624405

Anderson, D. L.

The /sup 1/H nuclear magnetic resonance was studied in the yttrium-hydrogen system YH/sub x/ in the composition range 0.20 less than or equal to x less than or equal to 1.98 and temperature range 77 K less than or equal to T less than or equal to 490/sup 0/K. Both ..cap alpha..- and ..beta..-phases of YH/sub x/ were investigated in polycrystalline (powdered) specimens. Rigid lattice proton resonance second moments were obtained for both ..cap alpha..- and ..beta..-phase samples. Analysis of the second moment for ..cap alpha..-YH/sub x/ (..cap alpha..-phase) indicates that the hydrogen resides in both the tetrahedral and octahedral interstitial sites of the hcp Y lattice. Second moment values for ..beta..-YH/sub x/ (..beta..-phase) indicate that a sizeable fraction of the octahedral interstitial sites in the fcc yttrium metal lattice are occupied by hydrogen, while a nonnegligible fraction of the tetrahedral interstitial sites are vacant. For example, in YH/sub 1.98/, 28% of the octahedral sites are occupied, while 15% of the tetrahedral sites are vacant. The results for ..beta..-YH/sub x/ also indicate that as the H concentration increases, the probability of H occupation of octahedral sites increases.

• Research Organization: Ames Lab., Ames, IA (United States)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5624405
• Report Number(s): IS-T-877; TRN: 80-005688
• Resource Relation: Other Information: Thesis
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
YTTRIUM HYDRIDES
PHASE STUDIES
ACTIVATION ENERGY
DIFFUSION
HYDROGEN
LATTICE PARAMETERS
LINE NARROWING
NUCLEAR MAGNETIC RESONANCE
PHASE TRANSFORMATIONS
CRYOGENIC FLUIDS
ELEMENTS
ENERGY
FLUIDS
HYDRIDES
HYDROGEN COMPOUNDS
MAGNETIC RESONANCE
NONMETALS
RESONANCE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360102* - Metals & Alloys- Structure & Phase Studies