Results 111 to 120 of about 16,067 (139)
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Characterization of Hafnium Diboride, HfB2 (0001), by XPS
Surface Science Spectra, 2000X-ray photoelectron spectra of a clean, well-ordered HfB2 (0001) single crystal surface are reported. A survey spectrum covering a binding energy range of 0 to 1000 eV is shown, which reveals the presence of minor amounts of oxygen and zirconium. Spectra over narrower binding energy ranges are also shown for the Hf 4f, B 1s, and Hf 4s/O 1s regions.
C. L. Perkins +3 more
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The energy landscape of glassy dynamics on the amorphous hafnium diboride surface
The Journal of Chemical Physics, 2014Direct visualization of the dynamics of structural glasses and amorphous solids on the sub-nanometer scale provides rich information unavailable from bulk or conventional single molecule techniques. We study the surface of hafnium diboride, a conductive ultrahigh temperature ceramic material that can be grown in amorphous films.
Duc, Nguyen +6 more
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Nanoscratch and nanofriction behavior of hafnium diboride thin films
Wear, 2008Abstract Hafnium diboride (HfB 2 ) offers an excellent combination of high bulk hardness (29 GPa), high melting point (3295 °C) and high wear resistance, thus making it an attractive material for wear resistant coatings. In this work, the nanoscale friction response of as-deposited and annealed HfB 2 films is reported.
Abhishek Chatterjee +4 more
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Microstructure and nanohardness of hafnium diboride after ion irradiations
Journal of Nuclear Materials, 1998Abstract In order to simulate helium and lithium appearance originating from the 10B (n,α)7Li reaction, that occurs under neutron irradiation in a PWR, hafnium diboride samples have been irradiated with He+ and Li+ ions at 350°C. As implanted and annealed materials have been characterised by TEM observations and nanohardness measurements. In spite of
P. Cheminant-Coatanlem +3 more
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Electrosynthesis of Hafnium Diboride From Cryolite-Alumina Melts Containing Hafnium and Boron Oxides
Russian Journal of Electrochemistry, 2005Electrosynthesis of hafnium diboride from cryolite-alumina melts containing hafnium and boron oxides is studied. Thermodynamic estimation and voltammetric measurements show this process to occur in one-stage. Hafnium diboride coatings on nickel are obtained by electrolysis.
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Preparation of Hafnium Diboride Nanopowders in an Anhydrous Na2B4O7 Ionic Melt
Inorganic Materials, 2015Reactions between hafnium powder and microcrystalline boron in a Na2B4O7 ionic melt have been studied at temperatures from 600 to 850°C. The results demonstrate that nanoparticulate hafnium diboride forms starting at 750°C. According to electron microscopy data, the HfB2 powder obtained at 850°C consists of nearly spherical particles 50–55 nm in ...
Sergey Shilkin +2 more
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Microstructural Damage in Hafnium Diboride Under Neutron Irradiation
Key Engineering Materials, 1997Pascale Cheminant +3 more
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Oxidation Behaviour of an Aluminium Nitride–Hafnium Diboride Ceramic Composite
Journal of the European Ceramic Society, 2005Abstract An aluminium nitride–hafnium diboride electroconductive particulate composite was produced via hot isostatic pressing without sintering aids. Oxidation kinetics studies were performed up to 1350 °C under a flow of pure oxygen using a microbalance. The reaction products were analysed using SEM and XRD techniques.
Yury Gogotsi, Davide Mattia
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Growth kinetics and properties of nanostructured hafnium diboride films
Technical Physics, 2009The composition, structure, substructure, and physicomechanical properties of hafnium diboride films deposited by nonreactive rf magnetron sputtering are studied by X-ray diffraction (including photographic recording) and electron microscopy. The results obtained are analyzed, and the film growth kinetics is revealed.
V. A. Konovalov, D. N. Terpiy
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Journal of the American Ceramic Society, 2008
Fine hafnium diboride (HfB 2 ) powders have been prepared by modified carbothermal/borothermal reduction of hafnium dioxide (HfO 2 ) at relatively low temperatures (1500°–1600°C) for 1–2 h.
De‐Wei Ni +3 more
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Fine hafnium diboride (HfB 2 ) powders have been prepared by modified carbothermal/borothermal reduction of hafnium dioxide (HfO 2 ) at relatively low temperatures (1500°–1600°C) for 1–2 h.
De‐Wei Ni +3 more
openaire +1 more source