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D loss as a function of temperature in ERD2 films on kovar with and without an intermediate Mo diffusion barrier

Proceedings of the 2008 International Hydrogen Conference - Effects of Hydrogen on Materials

Kammler, Daniel K.; Wampler, William R.; Van Deusen, Stuart B.; King, Saskia H.; Tissot, Ralph G.; Brewer, Luke N.; Espada Castillo, Loren I.; Goeke, Ronald S.

The mechanisms governing D loss in ErD2 films with and without a Mo diffusion barrier on kovar substrates were studied between 200 and 600 °C via in-situ Ion Beam Analysis (IBA). Significant intermixing between kovar and Er was observed above 450°C and between kovar and ErD2 above 500 °C. The D loss mechanism in ErD2 films was found to change from intermixing between kovar and ErD2 at low temperatures (< 500 °C) to thermal decomposition at higher temperatures (> 500 °C). Diffusion between kovar and ErD2 was measured isothermally at 500 and 550 °C. An activation energy of 2.1 eV and a pre-exponential factor of 0.071 cm2/s were determined. Diffusion between the kovar components and ErD2 film was inhibited by depositing a 200 nm Mo diffusion barrier between the kovar substrate and the ErD2 film. The processing of the Mo diffusion barrier was shown to impact its performance. Intermixing between the kovar / Mo / ErD2 stack becomes significant between 500 and 550 °C with a sputter deposited Mo diffusion barrier and between 550 and 600 °C for an electron-beam evaporated Mo diffusion barrier. Copyright © 2009 ASM International® All rights reserved.

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D loss as a function of temperature in ErD2 films on kovar with and without an intermediate Mo diffusion barrier

Kammler, Daniel K.; Wampler, William R.; Van Deusen, Stuart B.; King, Saskia H.; Tissot, Ralph G.; Brewer, Luke N.; Espada Castillo, Loren I.; Goeke, Ronald S.

{sm_bullet}Mixing from some thermal process steps thought to drive H,D,T loss - This does not appear to be a problem with the Mo/Er occluder stacks {sm_bullet}Diffusion barriers investigated to prevent mixing

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Summary of Sandia research on metal tritides : FY 2007

Snow, Clark S.; Kammler, Daniel K.; Ferrizz, Robert F.; Espada Castillo, Loren I.; Wixom, Ryan R.; Rodriguez, Marko A.

Sandia National Laboratories has cradle to grave responsibility for all neutron generators in the US nuclear weapons stockpile. As such, much research effort is exerted to develop a comprehensive understanding of all the major components of a neutron generator. One of the key components is the tritium containing target. The target is a thin metal tritide film. Sandia's research into metal tritides began in the early 1960's with a collaboration with the Denver Research Institute (DRI) and continues to this day with a major in house research effort. This document is an attempt to briefly summarize what is known about the aging of erbium tritide and to review the major publications conducted at Sandia in FY 07. First, a review of our knowledge of helium in erbium tritide will be presented. Second, executive summaries of the six major SAND reports regarding neutron tube targets published in FY07 by Department 2735, the Applied Science and Technology Maturation Department, and research partners are presented.

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14 Results
14 Results