Abstract
The 11.7 T 25Mg, 27Al, 29Si, and 11B MAS NMR spectra are reported for well-characterized grandidierite, (Mg,Fe)Al3SiBO9, which contains both Al and Mg in fivefold coordination with oxygen. The 25Mg spectrum is the first to be reported for 5Mg, and exhibits a quadrupolar lineshape from which the nuclear quadrupolar coupling constant (3.8 ± 0.1 MHz), the asymmetry parameter (0.6 ± 0.05), and the isotropic chemical shift (55 ± 2 ppm) were derived by spectral simulation. These spectroscopic parameters are discussed in terms of the crystallographic geometry of the fivefold-coordinated site.
This content is PDF only. Please click on the PDF icon to access.
You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
