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The anharmonic entropy is extracted from the experimental total entropy at temperatures up to melting for Na, K, and Rb. The anharmonic entropy is {}1% of the total entropy. When allowance is made for small constant errors in the data, the anharmonic entropy of these metals lies on a single curve; this curve is in qualitative agreement with earlier computer simulations for Na. The present results and the computer simulations suggest the failure of leading-order anharmonic perturbation theory.
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Duane C. Wallace (1992) studied this question.
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