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Elastic Properties and Thermal Expansion of NaNO 3 Single Crystal

All components of elastic stiffness and compliance in NaNO 3 crystal have been determined from room temperature to 300°C. They show anomalies associated with the phase transition in the vicinity of T c . Thermal expansion coefficients parallel and perpendicular to the three-fold axis exhibit λ-type temperature dependence near T c . The phase transition of NaNO 3 is discussed on the basis of a phenomenological theory with an order parameter related to an irreducible representation at k 8 point of D 5 3d .