Abstract
Nuclear magnetic resonance (NMR) spectra of the 9Be nucleus in an alexandrite (BeAl2-xCrxO4, x=0.02) single crystal, grown by the Czochralski method, have been investigated employing a Bruker FT NMR spectrometer. Two sets of NMR spectra for 9Be (I=3/2) were observed in the crystallographic planes. The principal X axis of the electric field gradient tensors for both is found to be along the crystallographic a axis. The principal Y and Z axes are located in the b-c plane at about 9 degrees from the crystallographic c and b axes, respectively. These results indicate that there are two magnetically inequivalent Be sites, but they are chemically equivalent. The temperature dependence of 9Be NMR spectra has been measured in the temperture range 120-440 K. e2qQ/h for 9Be is found to increase linearly whereas eta decreases with increasing temperature.
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