منابع مشابه
Picosecond amorphization of SiO2 stishovite under tension
It is extremely difficult to realize two conflicting properties-high hardness and toughness-in one material. Nano-polycrystalline stishovite, recently synthesized from Earth-abundant silica glass, proved to be a super-hard, ultra-tough material, which could provide sustainable supply of high-performance ceramics. Our quantum molecular dynamics simulations show that stishovite amorphizes rapidly...
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First-principles calculations show that the electronic structure of graphene on SiO2 strongly depends on the surface polarity and interface geometry. Surface dangling bonds mediate the coupling to graphene and can induce hole or electron doping via charge transfer even in the absence of extrinsic impurities in substrate. In an interface geometry where graphene is weakly bonded to an O-polar sur...
متن کاملElectronic Structure Theory of Radiation-Induced Defects in Si/SiO2
Radiation-induced defects in metal-oxide semiconductor (MOS) materials are a major problem for MOS devices exposed to high-energy radiation such as in space-based applications. Charge trapping at these defect sites degrades the current/voltage performance of MOS devices and ultimately leads to device failure. A physical understanding of the structure and formation mechanisms of these defects is...
متن کاملEquation of state of stishovite and interpretation of SiO2 shockcompression data
[1] We present an isothermal equation of state for the high-pressure stishovite phase of SiO2 based on synchrotron X-ray diffraction at 300 K to 60 GPa. The inferred equation of state is the same for stishovite synthesized from pure SiO2 glass as from a natural, basalt glass that forms stishovite in association with other mineral phases, yielding a zeropressure bulk modulus K0T = 312.9(±3.4) GP...
متن کاملFracture-induced amorphization of polycrystalline SiO2 stishovite: a potential platform for toughening in ceramics
Silicon dioxide has eight stable crystalline phases at conditions of the Earth's rocky parts. Many metastable phases including amorphous phases have been known, which indicates the presence of large kinetic barriers. As a consequence, some crystalline silica phases transform to amorphous phases by bypassing the liquid via two different pathways. Here we show a new pathway, a fracture-induced am...
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ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2019
ISSN: 1742-6588,1742-6596
DOI: 10.1088/1742-6596/1352/1/012032