Ultrahydrous stishovite from high-pressure hydrothermal treatment of SiO2
نویسندگان
چکیده
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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Surface modification of titanium was investigated by means of hydrothermal treatment with a maximum pressure of 6.3 MPa (280 degrees C temperature) in CaO solution or water to improve bioactivity and biocompatibility. As a result, calcium titanate was formed on the titanium surface. Moreover, titanium oxide and titanium hydroxide layers on the surface increased as temperature and pressure incre...
متن کاملElectron-density distribution in stishovite, SiO2: a new high-energy synchrotron-radiation study.
The electron-density distribution of the high-pressure polymorph of SiO2, stishovite [a = 4.177 (1), c = 2.6655 (5) A, space group P4(2)/mnm, Z = 2], has been redetermined by single-crystal diffractometry using synchrotron radiation of 100.42 and 30.99 keV, respectively, in order to obtain essentially absorption- and extinction-free data. Room-temperature diffraction experiments on two samples ...
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: Proceedings of the National Academy of Sciences
سال: 2011
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.1117152108