Uptake rates for hydrogen by Nb and Ta; effect of thin metallic overlayers

PDF Version Also Available for Download.

Description

The hydrogen uptake rates of clean Nb and Ta foils were measured as a function of temperature and pressure. The sticking coefficient (number of hydrogen atoms entering the bulk / number of hydrogen atoms hitting the surface) of hydrogen on clean Nb and Ta, at approx. = 2.2 x 10/sup -5/ Torr hydrogen and room temperature, was found to be surprisingly low, approx. = 0.005 and approx. = 0.05 respectively, resulting in very low uptake rates under these conditions. This result is explained on the basis of a model recently proposed. It was found that these uptake rates can be ... continued below

Physical Description

Pages: 12

Creation Information

Pick, M A; Strongin, M & Greene, M G January 1, 1980.

Context

This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this article can be viewed below.

Who

People and organizations associated with either the creation of this article or its content.

Publisher

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

Contact Us

What

Descriptive information to help identify this article. Follow the links below to find similar items on the Digital Library.

Description

The hydrogen uptake rates of clean Nb and Ta foils were measured as a function of temperature and pressure. The sticking coefficient (number of hydrogen atoms entering the bulk / number of hydrogen atoms hitting the surface) of hydrogen on clean Nb and Ta, at approx. = 2.2 x 10/sup -5/ Torr hydrogen and room temperature, was found to be surprisingly low, approx. = 0.005 and approx. = 0.05 respectively, resulting in very low uptake rates under these conditions. This result is explained on the basis of a model recently proposed. It was found that these uptake rates can be significantly enhanced or decreased by the surface deposition of a thin layer of Pd, Pt, or Ni. The hydrogen uptake rates, i.e., sticking coefficients, were measured as a function of the overlayer thickness. In the case of Pd it was found that a layer less than one monolayer thick will either not change or even inhibit the hydrogen uptake, whereas a layer over one monolayer thick will dramatically enhance the sticking coefficient to a value of 1. It was found that the change at one monolayer is related to a phase transition of the Pd surface layer at that coverage. Both Pt and Ni do not exhibit this effect but do influence the uptake rate by an amount depending on their thickness. Thick overlayers inhibit uptake due to a limited permeation rate through the layer.

Physical Description

Pages: 12

Notes

Dep. NTIS, PC A02/MF A01.

Source

  • International symposium on the properties and applications of metal hydrides, Colorado Springs, CO, USA, 7 Apr 1980

Language

Item Type

Identifier

Unique identifying numbers for this article in the Digital Library or other systems.

  • Report No.: BNL-27208
  • Report No.: CONF-800402-7
  • Grant Number: EY-76-C-02-0016
  • Office of Scientific & Technical Information Report Number: 5691282
  • Archival Resource Key: ark:/67531/metadc1092455

Collections

This article is part of the following collection of related materials.

Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

What responsibilities do I have when using this article?

When

Dates and time periods associated with this article.

Creation Date

  • January 1, 1980

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

Description Last Updated

  • April 24, 2018, 11:24 a.m.

Usage Statistics

When was this article last used?

Congratulations! It looks like you are the first person to view this item online.

Interact With This Article

Here are some suggestions for what to do next.

Start Reading

PDF Version Also Available for Download.

International Image Interoperability Framework

IIF Logo

We support the IIIF Presentation API

Pick, M A; Strongin, M & Greene, M G. Uptake rates for hydrogen by Nb and Ta; effect of thin metallic overlayers, article, January 1, 1980; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc1092455/: accessed September 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.