Nuclear magnetic resonance and infrared spectroscopic study of excess-boron olenite from Koralpe, Styria, Austria
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Bernd Marler
Abstract
Significant amounts of boron in both trigonal and tetrahedral coordination have been found through 11B magic-angle-spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy of natural olenite (aluminum-rich tourmaline) from Stoffhütte, Koralpe, Styria, Austria. The 11B MAS NMR spectrum consists of a superposition of two quadrupolar MAS peaks. A broad peak with δiso = 18.3 ppm, νQ = 1410 KHz, and η = 0.11 demonstrates the trigonal-planar environment of the BO3 group (relative area ratio = 80%). The narrow symmetrical peak (δiso = 0.0 ppm, νQ = 300 KHz, η = 0.00) represents tetrahedral BO4 groups (relative area ratio = 20%). An infrared spectrum shows hydroxyl stretching bands at low wavenumbers indicating that underbonded O atoms of the hexagonal ring (due to a partial replacement of [4]Si4+ by [4]B3+) form relatively strong hydrogen bonds with the protons of the hydroxyl groups. A 29Si MAS NMR spectrum shows a peak consisting of a main signal at -90 ppm and a shoulder at about -85 ppm. The main signal originates from Si atoms connected (via oxygen bridges) to two other Si atoms in the hexagonal ring, and the minor signal is from Si atoms connected to one Si and one B atom. No signal corresponding to [6]Si was detected in this natural olenite sample.
© 2015 by Walter de Gruyter Berlin/Boston
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- Nuclear magnetic resonance and infrared spectroscopic study of excess-boron olenite from Koralpe, Styria, Austria
Articles in the same Issue
- Presidential Address. Scales of disequilibrium and rates of equilibration during metamorphism
- Characterization of coexisting NH4- and K-micas in very low-grade metapelites
- Effect of sonic and ultrasonic frequencies on the crystallization of basalt
- Sulfur saturation limits in silicate melts and their implications for core formation scenarios for terrestrial planets
- Molecular water in beryl, VIAl2 [Be3Si6O18]·nH2O, as a function of pressure and temperature: An experimental study
- Fluid-induced nucleation of (Y + REE)-phosphate minerals within apatite: Nature and experiment. Part I. Chlorapatite
- X-ray spectroscopic investigations of fluids in the hydrothermal diamond anvil cell: The hydration structure of aqueous La3+ up to 300 °C and 1600 bars
- Fibrous nanoinclusions in massive rose quartz: HRTEM and AEM investigations
- Polysomatism in högbomite: The crystal structures of 10T, 12H, 14T, and 24R polysomes
- Ordering of hydroxyl defects in hydrous wadsleyite (β-Mg2SiO4)
- The crystal structure and cation ordering of Phase-X-(K1–x–n)2(Mg1–n[Al,Cr]n)2Si2O7H2x: A potential K- and H-bearing phase in the mantle
- Feasibility of determining the quantitative OH content of garnets with Raman spectroscopy
- Raman spectroscopic study of garnet inclusions in diamonds from the mantle transition zone
- Raman spectroscopy of Fe2O3 to 62 GPa
- Study of the (010) olivine surface by Rutherford backscattering spectrometry in channeling geometry
- Equation of state of dense hydrous magnesium silicate phase A, Mg7Si2O8(OH)6
- Si-F bonding in aluminosilicate glasses: Inferences from ab initio NMR calculations
- Monoclinic nearly stoichiometric wüstite at low temperatures
- On the nature of tincalconite
- Letters. Chloride ion sites in silicate and aluminosilicate glasses: A preliminary study by 35Cl solid-state NMR
- Nuclear magnetic resonance and infrared spectroscopic study of excess-boron olenite from Koralpe, Styria, Austria
