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Title: Be:B Amorphous Coatings and Order-Disorder Transitions

Abstract

Here Be:B films were explored as a possible ablator material for use in inertial confinement fusion target capsules. It was found that Be:B forms an amorphous structure near the eutectic composition of 11 to 12 at. % B. It is believed that having an amorphous ablator should be useful in suppressing Rayleigh-Taylor instabilities during compression of the target. As the composition is moved away from the eutectic, an amorphous-to–columnar structure transition was more likely to be observed after some finite thickness of amorphous material had been deposited. Microstructural analysis indicated that this transition involved the nucleation of nanocrystal structures within the amorphous matrix. This nanocrystal nucleation is believed to be due to supersaturation of the dopant atom in the host. Finally, an efficient packing analysis is also presented in an effort to explain the most favorable amorphous composition of 11 to 12 at. % B doping observed.

Authors:
 [1];  [1];  [1];  [1];  [1]
  1. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1481000
Grant/Contract Number:  
NA0001808
Resource Type:
Accepted Manuscript
Journal Name:
Fusion Science and Technology
Additional Journal Information:
Journal Volume: 73; Journal Issue: 3; Journal ID: ISSN 1536-1055
Publisher:
American Nuclear Society
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Be:B films; inertial confinement; fusion targets

Citation Formats

Xu, H., Huang, H., Walker, J., Elsner, F. H., and Farrell, M. P. Be:B Amorphous Coatings and Order-Disorder Transitions. United States: N. p., 2017. Web. doi:10.1080/15361055.2017.1396180.
Xu, H., Huang, H., Walker, J., Elsner, F. H., & Farrell, M. P. Be:B Amorphous Coatings and Order-Disorder Transitions. United States. doi:10.1080/15361055.2017.1396180.
Xu, H., Huang, H., Walker, J., Elsner, F. H., and Farrell, M. P. Tue . "Be:B Amorphous Coatings and Order-Disorder Transitions". United States. doi:10.1080/15361055.2017.1396180. https://www.osti.gov/servlets/purl/1481000.
@article{osti_1481000,
title = {Be:B Amorphous Coatings and Order-Disorder Transitions},
author = {Xu, H. and Huang, H. and Walker, J. and Elsner, F. H. and Farrell, M. P.},
abstractNote = {Here Be:B films were explored as a possible ablator material for use in inertial confinement fusion target capsules. It was found that Be:B forms an amorphous structure near the eutectic composition of 11 to 12 at. % B. It is believed that having an amorphous ablator should be useful in suppressing Rayleigh-Taylor instabilities during compression of the target. As the composition is moved away from the eutectic, an amorphous-to–columnar structure transition was more likely to be observed after some finite thickness of amorphous material had been deposited. Microstructural analysis indicated that this transition involved the nucleation of nanocrystal structures within the amorphous matrix. This nanocrystal nucleation is believed to be due to supersaturation of the dopant atom in the host. Finally, an efficient packing analysis is also presented in an effort to explain the most favorable amorphous composition of 11 to 12 at. % B doping observed.},
doi = {10.1080/15361055.2017.1396180},
journal = {Fusion Science and Technology},
number = 3,
volume = 73,
place = {United States},
year = {2017},
month = {12}
}

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Figures / Tables:

Fig. 1 Fig. 1: (a) SEM cross sectional image of a Be:B coating on a GDP mandrel. 7µm Be:B Coating with B concentration of 11 at.% shows non-columnar structure. (b) SEM cross sectional image of Be:B coating on Si substrate. The coating is ~57 µm thick with B concentration of 12 at.%more » and showed non-columnar structure. Both films are presumed to be amorphous in nature. Both 1a and 1b are fractured cross section. Any features without regular columnar characteristics are likely due to fracture.« less

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Works referenced in this record:

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.