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We have investigated the mechanical properties of neutron irradiated Czochralski (NICZ) silicon using nanoindentation combined with micro-Raman spectroscopy. It is found that NICZ silicon shows higher hardness (~13% higher) than non-irradiated one, with a slightly lower Young's modulus. When the samples were subjected to isochronal anneals in the temperature range of 250-650 oC, the hardness of NICZ silicon gradually decreases as the temperature increases and it is finally comparable to that of non-irradiated one. The vacancies and vacancy-oxygen defects induced by neutron irradiation in NICZ silicon annihilate or transform into more complex defects during the annealing processes. It suggests that the vacancy defects play a role in the evolution of hardness, which promotes phase transition from the Si-I phase to the stiffer Si-II phase in NICZ silicon during indentation. In addition, the irradiation induced vacancy defects could lead to the lower Young's modulus.
This article was published in the following journal.
Name: Journal of physics. Condensed matter : an Institute of Physics journal
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The property of emitting radiation while being irradiated. The radiation emitted is usually of longer wavelength than that incident or absorbed, e.g., a substance can be irradiated with invisible radiation and emit visible light. X-ray fluorescence is used in diagnosis.
The scattering of NEUTRONS by matter, especially crystals, with accompanying variation in intensity due to interference effects. It is useful in CRYSTALLOGRAPHY and POWDER DIFFRACTION.
A trace element with the atomic symbol B, atomic number 5, and atomic weight 10.81. Boron-10, an isotope of boron, is used as a neutron absorber in BORON NEUTRON CAPTURE THERAPY.
The properties and processes of materials that affect their behavior under force.
The properties, processes, and behavior of biological systems under the action of mechanical forces.