Abstract
We have studied the zero-field hyperfine splitting of 
in ferrimagnetic 
(x = 1, 1.5, 2) using spin-echo NMR at 4.2 K. Distinct spectra arising from the different sites characterized by the numbers of carbon nearest neighbours (NN = 0, 1, 2, 3) are observed. The measured hyperfine parameters 
and 
for all four spectra are given for x = 1.5 and 2. Analysis of the quadrupolar splitting indicates that in 
the dominant contribution to the magnetocrystalline anisotropy arises from the NN = 3 sites.
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