Single-Crystal 27 Al NMR Study of Corundum ¥á-Al2O3

摘要

27Al NMR chemical shielding, quadrupolar coupling, and dipolar coupling interactions for corundum (メ-Al2O3) are determined from the single-crystal 27 Al NMR spectra according to the rotation about three orthogonal axis. 27 Al NMR parameters obtained in this work with high accuracy are as follows: ヤiso = 7.4(4) ppm, QCC = 2.30(4) MHz, h = 0.08(3), and R = 2.0(3) kHz. This work appears to be the first NMR measurement of an aluminum-aluminum dipolar coupling interaction in メ-Al2O3 crystals.