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The Néel temperature (T N ) of (Mg 1-X ,Fe X )O and its compositional dependence have been studied with a superconducting quantum interference device (SQUID) in the temperature range 5-300 K at constant magnetic field of 1000 Oe. We determined the magnetic phase diagram at ambient pressure. As the T N  constantly increased with iron content, we found a kink in the paramagnetic-antiferromagnetic boundary at around X = 0.5, which suggests a possible change of the magnetic structure in the antiferromagnetic state. We propose that the magnetic boundary ends at X = 0.12(1) and 0 K. Our results show that the pressure of the rhombohedral distortions of (Mg,Fe)O can be very sensitive to Fe content if the structure distortion is correlated to magnetic ordering

Néel transition in (Mg,Fe)O: A possible change of magnetic structure