The Orientational Ordering in Dilute Solid N2–Ar Mixtures

NMR studies have been carried out to determine the nature of the orientational ordering of N2in dilute solid N2–Ar mixtures. The orientational ordering for cubic lattices (x(N2)≍50%) was compared to that observed for the hexagonal lattice structures for 57 < x(N2) < 75%. The NMR line shapes for the cubic structures were found to be sharply defined and could only be explained in terms of a narrow distribution of order parameters. This is in contrast to the quadrupolar glass state with a very broad order parameter distribution observed for the hexagonal structures.