Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
91 (2002), S. 4438-4446
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Electron paramagnetic resonance (EPR) signals from powdered samples of boron carbide B4C are recorded at g factor 2.0028±0.0002. The dependence on temperature and thermal treatment of the samples is studied. We demonstrated that native defects of boron carbide and conduction electrons are responsible for EPR absorption. The temperature dependence of the EPR line width ΔB(T) is accounted for via the Korringa mechanism. By fitting experimental and theoretical curves for ΔB(T), distances of donor levels from the edge of the conduction band ΔEd are obtained. The process of sample preparation strongly effects the value of ΔEd. We assume a radical formation of the type B3C with local concentration Nloc∼1019–2×1020 cm−3 is responsible for the EPR signal under these conditions. © 2002 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1448879
Permalink
|
Location |
Call Number |
Expected |
Availability |
