Nuclear magnetic resonance survey of hydrogen motion and electronic structure in. alpha. -phase (Nb-Mo)-H alloys

Conference · Mon Jan 01 04:00:00 EST 1990

OSTI ID:6858035

Ibanez-Meier, R; Torgeson, D R; Barnes, R G ^[1]

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1. Ames Lab., IA (USA) Iowa State Univ. of Science and Technology, Ames, IA (USA). Dept. of Physics

The results of a proton nuclear magnetic resonance (NMR) survey of hydrogen motion and electronic structure in the solid solution ({alpha}) phase of niobium rich Nb{sub 1-y} Mo{sub y}H{sub x} alloys are reported (y{le}0.2, x{le}0.2). Measurements of the temperature dependence of the proton spin-lattice relaxation time T{sub 1} over the range 20{le}T{le}800 K were analyzed to yield values of the activation energy E{sub a} and jump attempt frequency {nu}{sub 0} for hydrogen diffusive hopping and of the product T{sub 1e}T = C{sub e} indicative of the electronic density-of-states at the Fermi level, N(E{sub F}), where T{sub 1e} is that contribution to T{sub 1}. The T{sub 1} vs T behavior shows features characteristic of hydrogen in random alloys, reflecting a distribution of E{sub a} and {nu}{sub 0} values. At high temperatures ({approximately}500 K), T{sub 1} exhibits anomalous behavior, passing through a maximum and decreasing again at higher temperatures in the same manner found in the Nb--H and (Nb--V)-H systems. 10 refs., 2 figs.

• Research Organization: Ames Lab., IA (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6858035
• Report Number(s): IS-M-639; CONF-9009141--4; ON: DE90018044
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
656002* -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACTIVATION ENERGY
ALLOYS
BARYONS
ELECTRONIC STRUCTURE
ELEMENTARY PARTICLES
ELEMENTS
ENERGY
FERMIONS
HADRONS
HYDROGEN
MAGNETIC RESONANCE
MOLYBDENUM ALLOYS
NIOBIUM ALLOYS
NIOBIUM BASE ALLOYS
NONMETALS
NUCLEAR MAGNETIC RESONANCE
NUCLEONS
PROTONS
RELAXATION
RESONANCE
SPIN-LATTICE RELAXATION
TEMPERATURE DEPENDENCE