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

Jürgen Haase, Eric Oldfield, Kirk Schmitt

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish (US)
Pages (from-to)274-280
Number of pages7
JournalChemical Physics Letters
Volume193
Issue number4
DOIs
StatePublished - May 29 1992

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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