Abstract
We reported 11B nuclear magnetic resonance studies of boron nitride (BN) nanotubes prepared by mechano-thermal route. The NMR lineshape obtained at 192.493 MHz (14.7 T) was fitted with two Gaussian functions, and the 11B nuclear magnetization relaxations were satisfied with the stretched-exponential function, exp[-(t/T1)(D+1)/6] (D: space dimension) at all temperatures. In addition, the temperature dependence of spin-lattice relaxation rates was well described by T1-1=aT (a: constant, T: temperature) and could be understood in terms of direct phonon process. All the 11BNMR results were explained by considering the inhomogeneous distribution of the paramagnetic metal catalysts, such as α-Fe, Fe-N, and Fe2 B, that were incorporated during the process of high-energy ball milling of boron powder and be synthesized during subsequent thermal annealing. X-ray powder diffraction as well as electron paramagnetic resonance (EPR) on BN nanotubes were also conducted and the results obtained supported these conclusions.
Original language | English |
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Pages (from-to) | 419-423 |
Number of pages | 5 |
Journal | Solid State Communications |
Volume | 134 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2005 May |
Bibliographical note
Funding Information:This work was supported by the Center for Nanoscale Mechatronics and Manufacturing.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
Keywords
- A. Nanotube
- D. Spin-lattice relaxation
- E. Nuclear magnetic resonance
ASJC Scopus subject areas
- General Chemistry
- Condensed Matter Physics
- Materials Chemistry