  Low-temperature, high-field (H[-110] <= 7.5 T), neutron diffraction
experiments on single-crystal Ce0.70Pr0.30B6 are reported. Two successive
incommensurate phases are found to exist in zero field. The appearance, for H
>= 4.6 T at T = 2 K, of an antiferromagnetic structure, k{AF} = (1/2, 1/2,
1/2), most likely due to an underlying antiferroquadrupolar order, is discussed
in connection with recent x-ray diffraction experiments.
