Fabrication and magnetic property of novel (Co,Zn,Fe,Mn,Ni)3O4 high-entropy spinel oxide

A new high-entropy spinel oxide, namely (Co,Zn,Fe,Mn,Ni)₃O₄, has been prepared by solution combustion synthesis method at different temperatures from 350 °C to 750 °C. The structure and magnetic property are compared with those of (Co,Cr,Fe,Mn,Ni)₃O₄, (Zn,Cr,Fe,Mn,Ni)₃O₄ and (Co,Cr,Fe,Mn,Zn)₃O₄. The X-ray diffraction demonstrates all samples are single-phase spinel structure. Their lattice parameters decrease with reduction in the ionic radius of Cr³⁺, Zn²⁺, Co²⁺ and Ni²⁺. The energy dispersive spectrum spectra and mapping show a random, uniform and equiatomic distribution of all the elements. Further, magnetic moment and crystallite size can be controlled through the components of high-entropy oxides, to achieve tailorable magnetic property.