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A combined x-ray and neutron diffraction study has shown that the so-called "triple-→q" structure is not the correct model of the magnetic structure of neodymium. The x-ray data showed only the Bragg reflections originating from the double-hcp lattice. Hence, all additional reflections observed below TN by neutrons are of magnetic origin. Additional neutron-diffraction data have shown that the magnetic structure must be described by modulation wave vectors with components both parallel and perpendicular to the $〈100〉$ axes.
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Lebech et al. (1979) studied this question.
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