Entropy-dominated dissipation in sapphire shock-compressed up to 400 GPa (4 Mbar)
نویسندگان
چکیده
منابع مشابه
Melting curve and Hugoniot of molybdenum up to 400 GPa by ab initio simulations
We report ab initio calculations of the melting curve and Hugoniot of molybdenum for the pressure range 0 − 400 GPa, using density functional theory (DFT) in the projector augmented wave (PAW) implementation. We use the “reference coexistence” technique to overcome uncertainties inherent in earlier DFT calculations of the melting curve of Mo. Our calculated melting curve agrees well with experi...
متن کاملRobust zero resistance in a superconducting high-entropy alloy at pressures up to 190 GPa
We report the observation of extraordinarily robust zero-resistance superconductivity in the pressurized (TaNb)0.67(HfZrTi)0.33 high-entropy alloy--a material with a body-centered-cubic crystal structure made from five randomly distributed transition-metal elements. The transition to superconductivity (TC ) increases from an initial temperature of 7.7 K at ambient pressure to 10 K at ∼60 GPa, a...
متن کاملRefractive Index of Lithium Fluoride Ramp Compressed to 800 GPa
LLE Review, Volume 126 59 Introduction The transition of an insulator to a metal (metallization) at high compression is generally the result of pressure-induced closure of the band gap.1–4 Lithium fluoride’s (LiF’s) largeband-gap and ionic crystalline structure produces its uniquely high ultraviolet transmissivity. Two rare-gas solids, He and Ne, have anomalously high metallization pressures be...
متن کاملA versatile photoelectron spectrometer for pressures up to 30 mbar.
High-pressure photoelectron spectroscopy is a rapidly developing technique with applications in a wide range of fields ranging from fundamental surface science and catalysis to energy materials, environmental science, and biology. At present the majority of the high-pressure photoelectron spectrometers are situated at synchrotron end stations, but recently a small number of laboratory-based set...
متن کاملThe electrical conductivity of Al2O3 under shock-compression
Sapphire (Al2O3) crystals are used below 100 GPa as anvils and windows in dynamic-compression experiments because of their transparency and high density. Above 100 GPa shock pressures, sapphire becomes opaque and electrically conducting because of shock-induced defects. Such effects prevent temperature and dc conductivity measurements of materials compressed quasi-isentropically. Opacities and ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2010
ISSN: 1742-6596
DOI: 10.1088/1742-6596/215/1/012148