Glasses Tech

September 22, 2009

Detection of multiple boron sites in glasses by satellite transition nuclear magnetic resonance spectroscopy

Filed under: Glasses 1995 — admin @ 1:54 am

Eyeglasses

The magic-angle spinning sidebands of the satellite transition (ST, m equals plus or minus 3/2 arrow left right plus or minus one half ) for **1**1B nuclear magnetic resonance (**1**1B ST spectroscopy) have been used to detect multiple boron sites in Na//2O-B//2O//3-SiO//2 glasses. The experimental details and data analysis are described, how multiple BO//4 and BO//3 units can be distinguished using standard magic-angle spinning. For a 16Na//2O-30B//2O//3-53.9SiO//2 glass (0.1 MnO) two BO//4 units with chemical shifts of minus 2.5 and 0 ppm were found which differ considerably in their quadrupole interaction. Besides this we found three different BO//3 units with approximate chemical shifts of 17, 15, and 19 ppm. The results are compared with earlier measurements. (Author abstract) 35 Refs.

Jaeger, C. Herzog, K. Thomas, B. Feike, M. Kunath-Fandrei, G.

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