Results 181 to 190 of about 20,006 (235)

Synthesis of Cubic Boron Nitride by Decomposition of Magnesium Boron Nitride

Journal of the American Ceramic Society, 1992
Cubic boron nitride ( c ‐BN) was synthesized by the decomposition of Mg 3 BN 3 under high pressure and high temperature.
Satoshi Nakano, Hiroyuki Ikawa, Osamu Fukunaga   +2 more
openaire   +1 more source

Boron suboxide: As hard as cubic boron nitride

Applied Physics Letters, 2002
The 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, Yusheng Zhao, L. Daemen, J. Qian, T. D. Shen, T. W. Zerda   +5 more
openaire   +1 more source

Laser deposited cubic boron nitride films

Carbon, 1990
ABSTRACTWe report the successful growth of cubic boron nitride thin films on single crystal 100 silicon by using pulsed excimer laser ablation of a hexagonal boron nitride bulk target. Optical emission spectra were obtained during the film deposition giving insight into the deposition mechanism.
Gary L. Doll, Jeffrey A. Sell, Lourdes Salamanca-riba, Ashwin K. Ballal   +3 more
openaire   +1 more source

The near edge structure of cubic boron nitride

Micron, 2012
We compare the near edge structure (NES) of cubic boron nitride (cBN) measured using both electron energy loss spectroscopy (EELS) and X-ray absorption spectroscopy (XAS) with that calculated using three commonly used theoretical approaches. The boron and nitrogen K-edges collected using EELS and XAS from cBN powder were found to be nearly identical ...
D G, McCulloch, D W M, Lau, R J, Nicholls, J M, Perkins   +3 more
openaire   +2 more sources

Title: Periodic Mesoporous Hexagonal Boron Nitride at High Pressure: A Route to Cubic Boron Nitride Nanocrystals and Mesoporous Cubic Boron Nitride

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, Cong Liu, Toby Sanders, Fadi Haso, Venkata Bhadram, Ilke Arslan, Tianbo Liu, Yingwei Fei, Kai Landskron   +8 more
openaire   +1 more source

Transformation of Cubic Boron Nitride to a Graphitic Form of Hexagonal Boron Nitride

Nature, 1959
R. H. WENTORF1 has reported that a fragment of borazon (synthetic cubic boron nitride) was twice heated to over 2000°C. in vacuo without change. Dr. Wentorf was kind enough to supply us with some small specimens, both black and yellow. Some of these, which gave random-rotation X-ray photographs showing them to be twins (only two nearly single crystals ...
H. JUDITH MILLEDGE, E. NAVE, F. H. WELLER   +2 more
openaire   +1 more source

Cubic Phase of Boron Nitride by AES

Surface Science Spectra, 1992
Auger electron spectra of the cubic phase of boron nitride are presented. The line shapes of the boron and nitrogen KLL transitions are characteristic for this phase of boron nitride. Therefore, cubic-boron nitride can be distinguished from other phases of boron nitride based on Auger line shapes.
Steven J. Simko, Maria C. Militello
openaire   +1 more source

Melting of cubic boron nitride at extreme pressures

Journal of Physics: Condensed Matter, 2012
Due to its large pressure range of stability and inert nature, cubic boron nitride has been proposed as a potential pressure standard for high pressure experiments. It is extremely refractive upon compression, although its melting temperature is not known beyond 10 GPa.
openaire   +2 more sources

Lanthanide Doped Cubic Boron Nitride

MRS Proceedings, 2002
ABSTRACTFirst 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, T. Taniguchi, U. Wahl, J. Correia, A. Müller, C. Ronning, H. Hofsäss, M. Dietrich, Isolde Collaboration   +8 more
openaire   +1 more source

Synthesis of boron nitride with a cubic mesostructure

Microporous and Mesoporous Materials, 2006
The synthesis of mesoporous boron nitride by using tri(methylamino)borazine (MAB) as boron nitride source and a cubic mesoporous carbon (CMK-8) as template is described. The X-ray diffraction, TEM and pore size analysis show that the structure of the mesoporous BN consists in a 3D cubic array of uniform mesopores of 4.7 nm in diameter.
Philippe Dibandjo, Fernand Chassagneux, Laurence Bois, Catherine Sigala, Philippe Miele   +4 more
openaire   +1 more source