Radiative Lifetimes of uv Multiplets in Boron, Carbon, and Nitrogen

1966 ◽  
Vol 141 (1) ◽  
pp. 67-70 ◽  
Author(s):  
G. M. Lawrence ◽  
Blair D. Savage
Keyword(s):  
Radiative Lifetimes ◽  
Carbon And Nitrogen ◽  
Boron Carbon

Apfim Investigation of Segregation in a Nickel Base Alloy

1998 ◽  
Vol 4 (S2) ◽  
pp. 118-119
Author(s):  
M. Thuvander ◽  
K. Stiller
Keyword(s):  
Grain Size ◽  
Base Alloy ◽  
Atom Probe ◽  
Model Alloy ◽  
Probe Field ◽  
Inconel 600 ◽  
Carbon And Nitrogen ◽  
Heat Treated ◽  
Nickel Base ◽  
Boron Carbon

Segregation of boron, carbon and nitrogen to grain boundaries in a nickel based model alloy has been investigated using atom probe field ion microscopy (APFIM). The material corresponds to a commercial alloy (Inconel 600), but contains lower levels of alloy additives and impurities. The major composition was Ni-16Cr-10Fe (wt.%). The alloy was solution annealed at 950°C for 10 min, which resulted in a grain size of 20 μ. Subsequently heat treatments for 1 h at temperatures of 550°C, 600°C and 700°C were applied. TEM investigation showed that the heat treatment at 700°C resulted in precipitation of intergranular chromium-rich carbides. The other temperatures were obviously too low and the aging times too short to cause precipitation, since carbides were not observed in the materials heat treated at 550°C and 600°C.As the grain size was about 100 times larger than the accessible depth of APFIM analysis (≃200 nm), much care had to be taken in preparing samples containing a grain boundary close to the tip apex.

STRUCTURAL AND ELECTRONIC PROPERTIES OF BCN NANOFLAKES VIA GRAPH THEORY

2021 ◽  
Author(s):  
SHUSIL BHUSAL ◽  
JONGHOON LEE ◽  
AJIT K. ROY
Keyword(s):  
Graph Theory ◽  
Density Functional ◽  
Hexagonal Boron Nitride ◽  
Hexagonal Lattice ◽  
Stoichiometric Ratio ◽  
Carbon And Nitrogen ◽  
Novel Materials ◽  
Structural And Electronic Properties ◽  
Boron Carbon Nitride ◽  
Boron Carbon

Boron-carbon-nitride (BCN), a ternary system, enables us to compose a wide variety of novel materials due to their unique mechanical, thermal, and electrical properties. We study two-dimensional structures called nanoflakes made of boron, carbon, and nitrogen atoms arranged in hexagonal lattice structures. The physical properties of these nanostructures, in general, are functions of the overall shape, stoichiometric ratio of boron carbon and nitrogen atoms, and their distribution. In this study, we utilize graph theory to randomly generate these structures, forming three different phases: hexagonal graphene, hexagonal boron nitride, and hexagonal BCN in various proportions. We perform density functional theory (DFT) simulations to obtain the optimized nanoflake structures and analyze the electronic structure. Our results have important implications for future studies of novel materials based on BCN nanoflakes and their experimental realizations.

Relationship between the atomic characteristics of boron, carbon, and nitrogen, and their effect on the electronic structure of fcc iron

1998 ◽  
Vol 41 (6) ◽  
pp. 600-606
Author(s):  
I. A. Nechaev ◽  
A. Yu. Moskvichev ◽  
V. S. Demidenko ◽  
V. I. Simakov
Keyword(s):  
Electronic Structure ◽  
Carbon And Nitrogen ◽  
Boron Carbon

scholarly journals Characterization of Newly Synthesized Novel Graphite Films

1988 ◽  
Vol 121 ◽  
Author(s):  
Kannan M. Krishnan ◽  
John Kouvetakis ◽  
Takayoshi Sasaki ◽  
Neil Bartlett
Keyword(s):  
Cross Sections ◽  
Core Loss ◽  
Careful Study ◽  
New Materials ◽  
Carbon And Nitrogen ◽  
Resonance Energies ◽  
Fine Structures ◽  
Electron Energy Loss ◽  
Boron Carbon

ABSTRACTReactions of C5H6 and BCl3 at 800°C yields a metallic graphite-like material of composition BCx (3.0 ≤ x ≤ 4.00) while reactions of BCl3, NH3 and C2 produces a B/C/N graphitic semiconductor of approximate stoichiometry B2CN2. Both materials were shown to be homogeneous using Auger electron spectroscopy and extensively characterized by electron energy-loss spectroscopy. Single loss profiles of the EELS data were obtained using the fourier-log deconvolution method. Compositions were determined using hydrogenic cross-sections. A careful study of the plasmon resonance energies and the fine structures of the core-loss edges of these materials has been invaluable in demonstrating that the boron, carbon and nitrogen atoms are all sp2 hybridized. Therefore, these new materials are in-sheet graphite hybrids and not intercalations.

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