Results 221 to 230 of about 21,776 (269)
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Electronic correlations of cubic boron nitride
Physical Review B, 1991We have calculated total and binding energies of zinc-blende-structure boron nitride. Starting from a self-consistent-field ground-state calculation within a finite basis of Gaussian orbitals centered at the different atoms, the electron correlations were treated by applying the local ansatz.
, Ganduglia-Pirovano, , Stollhoff
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Lanthanide Doped Cubic Boron Nitride
MRS Proceedings, 2002ABSTRACTFirst basic investigations on lanthanide implanted cubic boron nitride were performed with focus on the site of the implanted ions as well as their luminescence behaviour. In order to investigate the lattice sites of lanthanides in c-BN, we implanted single crystal c-BN with radioactive 139Ce ions using the on-line isotope separator ISOLDE at ...
U. Vetter +8 more
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Superhard transparent polycrystalline cubic boron nitride
Applied Physics Letters, 2021Polycrystalline cubic boron nitride (PcBN) has been synthesized at 14 GPa and high temperatures of 1300–2000 °C in a two-stage multi-anvil cell. Sintered PcBN synthesized at 1700–1800 °C and 14 GPa with a grain size of ∼200 nm is optically transparent with a transmittance of ∼70% at wavelengths of 400–1500 nm and has the Vickers hardness of ∼63–69 GPa.
Mengxi Zhao +10 more
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Diamond and Related Materials, 2000
Abstract The use of Raman spectroscopy, and in particular Raman line shifts, to measure stress in diamond and nitrides such as gallium nitride (GaN), is well known. In both diamond and GaN the application is principally to study stresses in thin films and at the substrate–thin film interface.
R.M. Erasmus, J.D. Comins, M.L. Fish
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Abstract The use of Raman spectroscopy, and in particular Raman line shifts, to measure stress in diamond and nitrides such as gallium nitride (GaN), is well known. In both diamond and GaN the application is principally to study stresses in thin films and at the substrate–thin film interface.
R.M. Erasmus, J.D. Comins, M.L. Fish
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Synthesis of Cubic Boron Nitride by Decomposition of Magnesium Boron Nitride
Journal of the American Ceramic Society, 1992Cubic boron nitride ( c ‐BN) was synthesized by the decomposition of Mg 3 BN 3 under high pressure and high temperature.
Satoshi Nakano +2 more
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Boron suboxide: As hard as cubic boron nitride
Applied Physics Letters, 2002The Vickers hardness of boron suboxide single crystals was measured using a diamond indentation method. Under a loading force of 0.98 N, our test gave an average Vickers hardness of 45 GPa. The average fracture toughness was measured as 4.5 MPa m1/2. We also measured the hardness of the cubic boron nitride and sapphire single crystals for comparison ...
Duanwei He +5 more
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ChemistrySelect, 2017
Abstract Periodic mesoporous hexagonal boron nitride was investigated as a precursor for nanoscale forms of cubic boron nitride. Cubic boron nitride (c‐BN) nanocrystals were obtained at a pressure of 14 GPa and a temperature of 1300 °C.
Manik Mandal +8 more
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Abstract Periodic mesoporous hexagonal boron nitride was investigated as a precursor for nanoscale forms of cubic boron nitride. Cubic boron nitride (c‐BN) nanocrystals were obtained at a pressure of 14 GPa and a temperature of 1300 °C.
Manik Mandal +8 more
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Shock compression of cubic boron nitride
Journal of Applied Physics, 2009Hugoniot measurements have been performed on high-purity cubic boron nitride polycrystals in the pressure range up to 296GPa using a two-stage light-gas gun. Hugoniot parameters have been measured by a line reflection method and Fabry–Pérot velocimetry.
Nobuaki Kawai +4 more
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1999
Cubic BN (c-BN) is a compound crystallizing in the zinc-blende structure. It is the lightest among the III–V family. It possesses many unique phySiCal properties like extreme hardness, high melting point, high thermal conductivity, large band-gap energy, low dielectric constant, and high chemical stability. If the problems of crystal growth are solved,
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Cubic BN (c-BN) is a compound crystallizing in the zinc-blende structure. It is the lightest among the III–V family. It possesses many unique phySiCal properties like extreme hardness, high melting point, high thermal conductivity, large band-gap energy, low dielectric constant, and high chemical stability. If the problems of crystal growth are solved,
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Grinding with Cubic Boron Nitride
1974Beginning with a comparison of various abrasives and their mechanisms of wear, the specific problems when grinding high-speed steel with cubic boron nitride cup wheels are discussed. The necessary truing and dressing of the grinding section before the first usage is given special attention, because these preparations have an important effect on ground ...
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