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Title: Stabilizing effects of oxidation on propagating formation reactions occurring in nanometer-scale metal multilayers

Abstract

Reactive rare-earth / transition metal multilayers exhibit a variety of complex reaction behaviors depending on surrounding gaseous environment and material design. Small period (< 100 nm bilayer), 5 gm-thick Sc/Ag multilayers undergo self-sustained formation reactions when ignited in air or in vacuum. High-speed videography reveals unstable reaction waves in these samples, characterized by the repeated, transverse passage of narrow, spin bands. Intermediate Sc/Ag designs — with multilayer period between 100 and 200 nm — only react in air. These multilayers exhibit propagating reactions with alternating unstable and stable characteristics. Narrow, spin bands advance the reaction front stepwise. Soon after the passage of a transverse band, a trailing oxidation wave encroaches on the intermetallic reaction front temporarily pushing the stalled wave forward in a uniform manner. Viewed in full, these events repeat giving rise to a new oscillatory behavior. Sc/Ag multilayers having a large period (> 200 nm bilayer) also react exclusively in air but exhibit a different propagating mode. The oxidation of Sc combined with the exothermic reaction of metal species results in continually-stable waves characterized by a smooth wavefront morphology and uniform velocity. The flame temperatures associated with propagating waves are estimated using measured heats of reaction and enthalpy-temperaturemore » relationships in order to provide insight into the possible phase transformations that occur during these different exothermic reactions.« less

Authors:
 [1];  [1];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1530530
Report Number(s):
SAND-2019-6987J
Journal ID: ISSN 0040-6090; 676629
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Thin Solid Films
Additional Journal Information:
Journal Name: Thin Solid Films; Journal ID: ISSN 0040-6090
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Adams, David P., Abere, Michael J. K., Sobczak, Catherine Elizabeth, and Rodriguez, Mark A. Stabilizing effects of oxidation on propagating formation reactions occurring in nanometer-scale metal multilayers. United States: N. p., 2019. Web. doi:10.1016/j.tsf.2019.05.068.
Adams, David P., Abere, Michael J. K., Sobczak, Catherine Elizabeth, & Rodriguez, Mark A. Stabilizing effects of oxidation on propagating formation reactions occurring in nanometer-scale metal multilayers. United States. doi:10.1016/j.tsf.2019.05.068.
Adams, David P., Abere, Michael J. K., Sobczak, Catherine Elizabeth, and Rodriguez, Mark A. Wed . "Stabilizing effects of oxidation on propagating formation reactions occurring in nanometer-scale metal multilayers". United States. doi:10.1016/j.tsf.2019.05.068.
@article{osti_1530530,
title = {Stabilizing effects of oxidation on propagating formation reactions occurring in nanometer-scale metal multilayers},
author = {Adams, David P. and Abere, Michael J. K. and Sobczak, Catherine Elizabeth and Rodriguez, Mark A.},
abstractNote = {Reactive rare-earth / transition metal multilayers exhibit a variety of complex reaction behaviors depending on surrounding gaseous environment and material design. Small period (< 100 nm bilayer), 5 gm-thick Sc/Ag multilayers undergo self-sustained formation reactions when ignited in air or in vacuum. High-speed videography reveals unstable reaction waves in these samples, characterized by the repeated, transverse passage of narrow, spin bands. Intermediate Sc/Ag designs — with multilayer period between 100 and 200 nm — only react in air. These multilayers exhibit propagating reactions with alternating unstable and stable characteristics. Narrow, spin bands advance the reaction front stepwise. Soon after the passage of a transverse band, a trailing oxidation wave encroaches on the intermetallic reaction front temporarily pushing the stalled wave forward in a uniform manner. Viewed in full, these events repeat giving rise to a new oscillatory behavior. Sc/Ag multilayers having a large period (> 200 nm bilayer) also react exclusively in air but exhibit a different propagating mode. The oxidation of Sc combined with the exothermic reaction of metal species results in continually-stable waves characterized by a smooth wavefront morphology and uniform velocity. The flame temperatures associated with propagating waves are estimated using measured heats of reaction and enthalpy-temperature relationships in order to provide insight into the possible phase transformations that occur during these different exothermic reactions.},
doi = {10.1016/j.tsf.2019.05.068},
journal = {Thin Solid Films},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {6}
}

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This content will become publicly available on June 12, 2020
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