Abstract
We have measured the nuclear magnetic resonance of 14N in cerous magnesium nitrate hydrate, Ce 2Mg 3(NO 3) 12 · 24H 2O, at 1 K in a magnetic field of 18.335 kG. The dipolar field at the nitrogen nucleus due to the Ce 3+ ions is appreciable at that temperature and field and produces phase shifts in the angular dependence of the spectra. This complicates the interpretation of the data and prevents one from using the customary techniques. From the measurements we have derived values for the quadrupolar coupling constant ( A = 0.160 ± 0.005 MHz), the asymmetry parameter ( η = 0.50 ± 0.05) and the directions of the electric-field gradient axes. The spectra show clearly that for the nitrate groups there is no center of inversion at the cerium ions.
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