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Only the final chapter of this book is concerned with crystallographic aspects.This, however, discusses the very interesting point that, despite the supposed theoretical simplicity of these elements, there is still no generally accepted explanation as to why the preferred crystal structure of Ne, Ar, Kr and Xe is never h.c.p, but always f.c.c. Landolt-Biirnstein. Numerical data and functionalrelationships in science and technology.Group III.Crystal and solid state physics.Vol. 7. Crystal structure data of inorganic compounds.Part e By
J. H. Robertson (Sun,) studied this question.