The Chemical Shift of the Si Nuclear Magnetic Resonance in a Synthetic Single Crystal of Mg
نویسندگان
چکیده
Z. Naturforsch. 40 a, 126-130 (1985); received November 23, 1984 Dedicated to Professor Dr. Alarich Weiss on the occasion of his 60th birthday The angular dependence of the chemical shift of the Si nuclear magnetic resonance has been measured in a synthetic single crystal of Mg2Si04 (space group Pbnm, Z = 4). The measurements were performed at room temperature at a frequency of 39.758 MHz using the FT-NMR technique. The eigenvalues of the shift tensor with respect to Si in TMS are Sx = — 38.8 ppm, <>i = —55.3 ppm and ö= — 95.4 ppm, with the eigenvector y parallel to c and the eigenvector z forming an angle of 7.5° with a. The results show clearly the influence of the individual S i 0 bonds on the chemical shift tensor. The chemical shift along the S i O bond depends in good approximation exponentially on the S i 0 bond distance.
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