TY - JOUR
T1 - A static and "magic-angle" sample-spinning nuclear magnetic resonance spectroscopic study of 11B in Si[B]. An analysis of spin-spin and spin-lattice relaxation behavior in the metallic state
AU - Haase, Jürgen
AU - Oldfield, Eric
AU - Schmitt, Kirk
N1 - Funding Information:
Correspondence to: E. Oldtield, Department of Chemistry, University of Illinois at Urbana-Champaign, 505 South Mathews Avenue, Urbana, IL 6 1801, USA. * This work was supported in part by the United States National Science Foundation Solid State Chemistry Program (grant DMR 88-14789) and by the Materials Research Laboratory Program (grant DMR 89-20538, JH).
PY - 1992/5/29
Y1 - 1992/5/29
N2 - We have investigated the signal intensity, lineshape, spin-lattice and spin-spin (spin-echo decay) relaxation behavior of 11B nuclei in a Si[B] extrinsic semiconductor in the metallic state, as a function of magnetic field strength and temperature. We find that essentially all boron spins are in a highly symmetric environment, characterized by a mean nuclear quadrupole coupling constant (e2qQ/h) of ≈ 12 kHz. The spin-lattice relaxation is Korringa like, with a T1T ≈ 550 s K, at both 5 and 300 K, indicating a mean Knight shift of ≈ 70 ppm. The spin-spin relaxation time, T2E, is 25 ms at 8.45 T, independent of temperature, or magnetic field strength in the range 2.35 to 11.7 T, at 300 K. The T2E value is in good agreement with the predictions of a model of homonuclear dipolar interactions within metallic Si[B] clusters.
AB - We have investigated the signal intensity, lineshape, spin-lattice and spin-spin (spin-echo decay) relaxation behavior of 11B nuclei in a Si[B] extrinsic semiconductor in the metallic state, as a function of magnetic field strength and temperature. We find that essentially all boron spins are in a highly symmetric environment, characterized by a mean nuclear quadrupole coupling constant (e2qQ/h) of ≈ 12 kHz. The spin-lattice relaxation is Korringa like, with a T1T ≈ 550 s K, at both 5 and 300 K, indicating a mean Knight shift of ≈ 70 ppm. The spin-spin relaxation time, T2E, is 25 ms at 8.45 T, independent of temperature, or magnetic field strength in the range 2.35 to 11.7 T, at 300 K. The T2E value is in good agreement with the predictions of a model of homonuclear dipolar interactions within metallic Si[B] clusters.
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U2 - 10.1016/0009-2614(92)85667-Y
DO - 10.1016/0009-2614(92)85667-Y
M3 - Article
AN - SCOPUS:44049118500
SN - 0009-2614
VL - 193
SP - 274
EP - 280
JO - Chemical Physics Letters
JF - Chemical Physics Letters
IS - 4
ER -