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Title: Diffusion of Ag, Au and Cs implants in MAX phase Ti3SiC2

Abstract

MAX phases (M: early transition metal; A: elements in group 13 or 14; X: C or N), such as titanium silicon carbide (Ti3SiC2), have a unique combination of both metallic and ceramic properties, which make them attractive for potential nuclear applications. Ti3SiC2 has been considered as a possible fuel cladding material. This study reports on the diffusivities of fission product surrogates (Ag and Cs) and a noble metal Au (with diffusion behavior similar to Ag) in this ternary compound at elevated temperatures, as well as in dual-phase nanocomposite of Ti3SiC2/3C-SiC and polycrystalline CVD 3C-SiC for behavior comparisons. Samples were implanted with Ag, Au or Cs ions and characterized with various methods, including x-ray diffraction, electron backscatter diffraction, energy dispersive x-ray spectroscopy, Rutherford backscattering spectrometry, helium ion microscopy, and transmission electron microscopy. The results show that in contrast to immobile Ag in 3C-SiC, there is a significant outward diffusion of Ag in Ti3SiC2 within the dual-phase nanocomposite during Ag ion implantation at 873 K. Similar behavior of Au in polycrystalline Ti3SiC2 was also observed. Cs out-diffusion and release from Ti3SiC2 occurred during post-implantation thermal annealing at 973 K. This study suggests caution and further studies in consideration of Ti3SiC2 as amore » fuel cladding material for advanced nuclear reactors operating at very high temperatures.« less

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1182888
Report Number(s):
PNNL-SA-107242
48707; 44713; NT0104000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Nuclear Materials, 462:310-320
Additional Journal Information:
Journal Name: Journal of Nuclear Materials, 462:310-320
Country of Publication:
United States
Language:
English
Subject:
Diffusion; MAX phase; Ti3SiC2; fuel cladding; Environmental Molecular Sciences Laboratory

Citation Formats

Jiang, Weilin, Henager, Charles H., Varga, Tamas, Jung, Hee Joon, Overman, Nicole R., Zhang, Chonghong, and Gou, Jie. Diffusion of Ag, Au and Cs implants in MAX phase Ti3SiC2. United States: N. p., 2015. Web. doi:10.1016/j.jnucmat.2015.04.002.
Jiang, Weilin, Henager, Charles H., Varga, Tamas, Jung, Hee Joon, Overman, Nicole R., Zhang, Chonghong, & Gou, Jie. Diffusion of Ag, Au and Cs implants in MAX phase Ti3SiC2. United States. doi:10.1016/j.jnucmat.2015.04.002.
Jiang, Weilin, Henager, Charles H., Varga, Tamas, Jung, Hee Joon, Overman, Nicole R., Zhang, Chonghong, and Gou, Jie. Sat . "Diffusion of Ag, Au and Cs implants in MAX phase Ti3SiC2". United States. doi:10.1016/j.jnucmat.2015.04.002.
@article{osti_1182888,
title = {Diffusion of Ag, Au and Cs implants in MAX phase Ti3SiC2},
author = {Jiang, Weilin and Henager, Charles H. and Varga, Tamas and Jung, Hee Joon and Overman, Nicole R. and Zhang, Chonghong and Gou, Jie},
abstractNote = {MAX phases (M: early transition metal; A: elements in group 13 or 14; X: C or N), such as titanium silicon carbide (Ti3SiC2), have a unique combination of both metallic and ceramic properties, which make them attractive for potential nuclear applications. Ti3SiC2 has been considered as a possible fuel cladding material. This study reports on the diffusivities of fission product surrogates (Ag and Cs) and a noble metal Au (with diffusion behavior similar to Ag) in this ternary compound at elevated temperatures, as well as in dual-phase nanocomposite of Ti3SiC2/3C-SiC and polycrystalline CVD 3C-SiC for behavior comparisons. Samples were implanted with Ag, Au or Cs ions and characterized with various methods, including x-ray diffraction, electron backscatter diffraction, energy dispersive x-ray spectroscopy, Rutherford backscattering spectrometry, helium ion microscopy, and transmission electron microscopy. The results show that in contrast to immobile Ag in 3C-SiC, there is a significant outward diffusion of Ag in Ti3SiC2 within the dual-phase nanocomposite during Ag ion implantation at 873 K. Similar behavior of Au in polycrystalline Ti3SiC2 was also observed. Cs out-diffusion and release from Ti3SiC2 occurred during post-implantation thermal annealing at 973 K. This study suggests caution and further studies in consideration of Ti3SiC2 as a fuel cladding material for advanced nuclear reactors operating at very high temperatures.},
doi = {10.1016/j.jnucmat.2015.04.002},
journal = {Journal of Nuclear Materials, 462:310-320},
number = ,
volume = ,
place = {United States},
year = {2015},
month = {5}
}