The mcan position and thc mean-square thermal displacement of the atom executed in thc doublequadratic well potential are derived as a function of the atomic order parameter on the basis of the mean ficld approximation. In contrast to the early split-atom potential model, the temperature dependent effective force constant is concluded and its influence on the mean-square thcrmal displacement is discussed. It is shown that the atomic order parameter, the effective force constant, the distance hctween equilibrium positions and the barrier height of the atom potential can be evaluated by comparing these thermal averages with experimental values.
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