Nuclear-magnetic-resonance studies of hydrogen antitrapping effects by impurities (Mn,Cr,Fe) in zirconium dihydride

Journal Article · Thu Nov 01 04:00:00 EST 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.42.7710· OSTI ID:5999329

Han, J ^[1]; Torgeson, D R; Barnes, R G ^[2]

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1. Korea Standards Research Institute, Taedok Science Town, Taejon (Republic of Korea)
2. Ames Laboratory, US Department of Energy, Ames, IA (USA) Department of Physics, Iowa State University, Ames, IA (USA)

We report nuclear-magnetic-resonance measurements of the proton spin-lattice relaxation time {ital T}{sub 1} in both pure and paramagnetic impurity-containing zirconium dihydrides. Measurements of the temperature dependence of the proton spin-lattice relaxation times {ital T}{sub 1} were made on two series of ZrH{sub {ital x}} samples (pure and impurity doped). The results show that paramagnetic impurities (Mn,Cr,Fe) contribute an additional spin-lattice relaxation rate {ital R}{sub 1{ital p}}, which is observed to increase in the sequence Fe{r arrow}Cr{r arrow}Mn and also to increase sharply with increasing hydrogen concentration at fixed impurity content in each case. The former result is consistent with the experimental results that the tendency towards localized moment formation in zirconium increases in the same sequence, whereas the latter may be accounted for by the antitrapping character of these impurities. Furthermore, the fit of {ital R}{sub 1{ital p}} data for the ZrH{sub 1.97} sample doped with 500 ppm Mn or Cr yields an activation energy {ital E}{sub {ital a}}=0.78 eV/atom, which is {approximately}75% of {ital E}{sub {ital a}} in the bulk.

• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5999329
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 42:13; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656002 -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHROMIUM
ELEMENTS
HYDRIDES
HYDROGEN
HYDROGEN COMPOUNDS
IMPURITIES
IRON
MAGNETIC RESONANCE
MANGANESE
METALS
NONMETALS
NUCLEAR MAGNETIC RESONANCE
QUANTITY RATIO
RELAXATION
RESONANCE
SPIN-LATTICE RELAXATION
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TRAPPING
ZIRCONIUM COMPOUNDS
ZIRCONIUM HYDRIDES