Anelastic studies of interstitially trapped hydrogen in niobium

Technical Report · Mon Jan 01 04:00:00 EST 1979

DOI:https://doi.org/10.2172/5492221· OSTI ID:5492221

Zapp, Philip Emerson

The trapping and quantum mechanical motion of hydrogen were investigated in Nb-O-H and Nb-N-H by anelastic relaxation. The measured relaxations were caused by the local, stress induced reorientation of single H atoms bound to single, essentially immobile O and N atoms. The symmetries and binding enthalpies of O-H pairs were studied in oriented single crystals of high-purity Nb using pulse-echo attenuation of very-high frequency longitudinal stress waves between 100 and 300/sup 0/K. Well-defined internal friction peaks were found in the <100>, <110>, and <111> directions of the b.c.c. lattice. Temperature dependence of the jump frequency of H below 100/sup 0/K was studied in the Nb-N-H system using lower frequency methods. Internal friction peaks were measured, relaxation times were calculated from strain relaxation measurement below 60/sup 0/K. Data show marked deviation from classical thermally activated Arrhenius behavior. (FS)

• Research Organization: Illinois Univ., Urbana (United States). Graduate Coll.
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76ER01198
• OSTI ID: 5492221
• Report Number(s): DOE/ER/01198--1299
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals &amp; Alloys-- Structure &amp; Phase Studies
ALLOYS
ANNEALING
CRYOGENIC FLUIDS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DIFFUSION
ELEMENTS
FLUIDS
GRAIN BOUNDARIES
GRAIN SIZE
HEAT TREATMENTS
HYDROGEN
HYDROGEN ADDITIONS
INTERSTITIALS
ION IMPLANTATION
METALS
MICROSTRUCTURE
NIOBIUM
NITROGEN
NITROGEN ADDITIONS
NONMETALS
ORIENTATION
OXYGEN
OXYGEN ADDITIONS
POINT DEFECTS
RECRYSTALLIZATION
REFRACTORY METALS
SIZE
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TRANSITION ELEMENTS
TRAPPING