Hydrogen permeation and diffusion in niobium

Journal Article · Tue Feb 01 04:00:00 EST 1983 · Metall. Trans., A; (United States)

DOI:https://doi.org/10.1007/BF02651617· OSTI ID:5434981

Sherman, R; Birnbaum, H K

High temperature hydrogen permeation experiments were performed on niobium using ultra high vacuum techniques in an attempt to maintain clean specimen surfaces. Diffusivities and permeabilities were measured from 700 K to about 1400 K at hydrogen pressures ranging from 4.26 Pa to about 0.013 Pa. The measured diffusivities are in agreement with values extrapolated from the low temperature surface independent measurements. In contrast to low temperature measurements, a trend indicating a classical isotope effect is observed for hydrogen and deuterium diffusivities in niobium at the higher temperatures. The measured hydrogen permeation constants agree with independent solubility and diffusivity measurements and are characterized by a negative enthalpy, as expected from low temperature solubility and diffusivity measurements. These results are contrasted with previou measurements which appear to have been controlled by surface reactions.

• Research Organization: Southwest Research Institute, San Antonio, TX 78284
• DOE Contract Number: AC02-76ER01198
• OSTI ID: 5434981
• Journal Information: Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States) Vol. 14A; ISSN MTTAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
CLEANING
DEUTERIUM
DEUTERIUM COMPOUNDS
DIFFUSION
ELEMENTS
HEAT TREATMENTS
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
ISOTOPE EFFECTS
ISOTOPES
LIGHT NUCLEI
MATERIALS TESTING
MECHANICAL TESTS
METALLOGRAPHY
METALS
NIOBIUM
NONMETALS
NUCLEI
ODD-ODD NUCLEI
PERMEABILITY
STABLE ISOTOPES
SURFACE CLEANING
SURFACE FINISHING
TEMPERATURE DEPENDENCE
TESTING
THERMAL DIFFUSION
TRANSITION ELEMENTS