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Title: A thermal desorption spectroscopy study of hydrogen trapping in polycrystalline α-uranium

Abstract

The kinetics of hydrogen desorption from polycrystalline α-uranium (α-U) was examined using thermal desorption spectroscopy (TDS). The goal was to identify the major trap sites for hydrogen and their associated trap energies. In polycrystalline α-U six TDS adsorption peaks were observed at temperatures of 521 K, 556 K, 607 K, 681 K, 793 K and 905 K. In addition, the desorption was determined to be second order based on peak shape. The position of the first three peaks was consistent with desorption from UH3. To identify the trap site corresponding to the high temperature peaks the data were compared to a plastically deformed sample and a high purity single crystal sample. The plastically deformed sample allowed the identification of trapping at dislocations while the single crystal sample allow for the identification of high angle boundaries and impurities. Thus, with respect to the desorption energy associated with each peak, values between 12.9 and 26.5 kJ/mole were measured.

Authors:
 [1];  [2]
  1. Univ. of Akron, Akron, OH (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1227462
Alternate Identifier(s):
OSTI ID: 1432083
Report Number(s):
LA-UR-14-28252
Journal ID: ISSN 0022-3115; PII: S0022311515001695
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 461; Journal Issue: C; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 36 MATERIALS SCIENCE; alpha uranium; hydride; trap site; thermal desorption spectroscopy; TDS; activation energy; single crystal

Citation Formats

Lillard, R. S., and Forsyth, R. T.. A thermal desorption spectroscopy study of hydrogen trapping in polycrystalline α-uranium. United States: N. p., 2015. Web. doi:10.1016/j.jnucmat.2015.03.023.
Lillard, R. S., & Forsyth, R. T.. A thermal desorption spectroscopy study of hydrogen trapping in polycrystalline α-uranium. United States. doi:10.1016/j.jnucmat.2015.03.023.
Lillard, R. S., and Forsyth, R. T.. Sat . "A thermal desorption spectroscopy study of hydrogen trapping in polycrystalline α-uranium". United States. doi:10.1016/j.jnucmat.2015.03.023. https://www.osti.gov/servlets/purl/1227462.
@article{osti_1227462,
title = {A thermal desorption spectroscopy study of hydrogen trapping in polycrystalline α-uranium},
author = {Lillard, R. S. and Forsyth, R. T.},
abstractNote = {The kinetics of hydrogen desorption from polycrystalline α-uranium (α-U) was examined using thermal desorption spectroscopy (TDS). The goal was to identify the major trap sites for hydrogen and their associated trap energies. In polycrystalline α-U six TDS adsorption peaks were observed at temperatures of 521 K, 556 K, 607 K, 681 K, 793 K and 905 K. In addition, the desorption was determined to be second order based on peak shape. The position of the first three peaks was consistent with desorption from UH3. To identify the trap site corresponding to the high temperature peaks the data were compared to a plastically deformed sample and a high purity single crystal sample. The plastically deformed sample allowed the identification of trapping at dislocations while the single crystal sample allow for the identification of high angle boundaries and impurities. Thus, with respect to the desorption energy associated with each peak, values between 12.9 and 26.5 kJ/mole were measured.},
doi = {10.1016/j.jnucmat.2015.03.023},
journal = {Journal of Nuclear Materials},
number = C,
volume = 461,
place = {United States},
year = {Sat Mar 14 00:00:00 EDT 2015},
month = {Sat Mar 14 00:00:00 EDT 2015}
}

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