Back to Search
Start Over
Magnesium behavior and structural defects in Mg+ ion implanted silicon carbide
- Source :
- Journal of Nuclear Materials. 458:146-155
- Publication Year :
- 2015
- Publisher :
- Elsevier BV, 2015.
-
Abstract
- As a candidate material for fusion reactor applications, silicon carbide (SiC) undergoes transmutation reactions under high-energy neutron irradiation with magnesium as the major metallic transmutant; the others include aluminum, beryllium and phosphorus in addition to helium and hydrogen gaseous species. The impact of these transmutants on SiC structural stability is currently unknown. This study uses ion implantation to introduce Mg into SiC. Multiaxial ion-channeling analysis of the as-produced damage state suggests that there are preferred Si interstitial splits. The microstructure of the annealed sample was examined using high-resolution scanning transmission electron microscopy. The results show a high concentration of likely non-faulted tetrahedral voids and possible stacking fault tetrahedra near the damage peak. In addition to lattice distortion, dislocations and intrinsic and extrinsic stacking faults are also observed. Magnesium in 3C-SiC prefers to substitute for Si and it forms precipitates of cubic Mg2Si and tetragonal MgC2. The diffusion coefficient of Mg in 3C-SiC single crystal at 1573 K has been determined to be 3.8±0.4×10e-19 m2/sec.
- Subjects :
- Nuclear and High Energy Physics
Materials science
Magnesium
Metallurgy
Analytical chemistry
chemistry.chemical_element
Microstructure
chemistry.chemical_compound
Tetragonal crystal system
Ion implantation
stomatognathic system
chemistry
Materials Science(all)
Nuclear Energy and Engineering
Silicon carbide
General Materials Science
Beryllium
Single crystal
Stacking fault
Subjects
Details
- ISSN :
- 00223115
- Volume :
- 458
- Database :
- OpenAIRE
- Journal :
- Journal of Nuclear Materials
- Accession number :
- edsair.doi.dedup.....3410517054d88cce79d6eeba3838d3bd
- Full Text :
- https://doi.org/10.1016/j.jnucmat.2014.12.071