High-field QCPMG NMR of strontium nuclei in natural minerals

Geoffrey M. Bowers, Andrew S. Lipton, Karl T. Mueller

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

The only stable NMR-active isotope of strontium, 87Sr, is a spin-9/2 quadrupolar nucleus that has a low gyromagnetic ratio, a low natural abundance, and a large nuclear electric quadrupole moment. In this work, we utilize the quadrupolar Carr-Purcell-Meiboom-Gill (QCPMG) pulse sequence and a 21.14 T NMR spectrometer at the Pacific Northwest National Laboratory to characterize the strontium sites in the natural minerals strontianite (SrCO 3) and celestine (SrSO4). QCPMG at 21.14 T was found to provide sensitivity enhancements of roughly two orders of magnitude over Hahn-echo experiments at an 11.74 T magnetic field. We extracted the quadrupolar parameters for the strontium nuclei through iterative simulations of the experimental spectra with the SIMPSON program by Bak, Rasmussen, and Nielsen. The data show that the quadrupolar parameters of 87Sr appear to be highly sensitive to the symmetry of the strontium coordination environment and can thus provide information about the strontium binding environment in complex systems.

Original languageEnglish (US)
Pages (from-to)95-103
Number of pages9
JournalSolid State Nuclear Magnetic Resonance
Volume29
Issue number1-3
DOIs
StatePublished - Feb 2006

All Science Journal Classification (ASJC) codes

  • Radiation
  • Chemistry(all)
  • Nuclear and High Energy Physics
  • Instrumentation

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