The free energy functional is derived for an electron gas interacting via insite Hubbard and intersite Heisenberg terms, scattered by some dilute, interstitial, non-magnetic impurities. The equation for the Curie temperature is deduced and discussed in various approximations. The existence is shown of a critical concentration of impurities destroing the ferromagnetism. The dirty specimen has the same critical exponents as the pure one, but the width of the critical region is modified.On deduit la fonctionelle de 1'8nergie libre d'un systeme d'electrons en interaction dbcrite par un hamiltonien aux termes de type Hubbard pour le mbme site du rbseau, Heisenberg pour sites differentes, complbtb par un potential decrivant des impuretes non-magn6tiques interstitielles. La deduction de ]'equation pour la temperature critique est suivie d'une discussion des diffhentes approximations. On prouve l'existence d'une concentration critique d'impureths detruisant le ferromagnetisme. Les exposants critiques sont les m6mes que pour le systkme pur, mais 1'6paisseur de la region critique est modifiee.
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