“…In view of that the quaternary spinel system Mg x Co 1−x Cr x Fe 2−x O 4 (x = 0.0, 0.25, 0.50, 0.75 and 1.0) was chosen for neutron diffraction study as functions of composition as well as temperature to have a clear understanding of the magnetic ordering in such a doubly substituted system. Our cation distribution study on the system reported recently [20] showed that the B site has become highly inhomogeneous in respect of magnetic ion concentration due to the presence of three types of magnetic ions (Cr 3+ , Fe 3+ and Co 2+ ) differing in strength of their magnetic moments and at the same time by the presence of the majority of nonmagnetic Mg 2+ ions. Shukla et al [21] reported the structural and magnetic properties of the system Mg x Co 1−x FeCrO 4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5 and 0.6) based on X-ray diffraction, magnetization, ac susceptibility and Mössbauer spectroscopy analysis.…”