Abstract
Equations with and without an external magnetic field were derived by using the Bethe-Peierls-Weiss method for the exchange energy and the effective field for iron. The numerical values for both the exchange energy and the effective field were obtained in the neighborhood of the Curie temperature. It was found that the external magnetic field does influence the exchange energy, and the critical point of the exchange energy at the Curie temperature vanishes if an external magnetic field is applied.
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