Preparation, Structural and Dielectric Behaviors of Co_xMn_1-xMn₂O₄ (0 ≤ x ≤ 1) Nanoparticles

Cobalt-manganese oxide nanoparticles become remarkable metal oxides due to their physical characters, for example, their electrical properties. In this paper, we report the synthesis of Co _x Mn_1-xMn₂O₄ (0 ≤ x ≤ 1) nanoparticles via a precipitation method. The structural and dielectric properties were investigated by means of X-ray diffractometer (XRD) and LCR-meter. From the data analysis, it was found that the Co _x Mn_1-xMn₂O₄ particles structured spinel cubic with the particle size ranging from 22.7 to 28.6 nm. Increasing Co²⁺ ions led to declining lattice and crystal volume of the Co _x Mn_1-xMn₂O₄ nanoparticles. Such phenomenon was originated from the substitution process of Co²⁺ ions that change the metal construction both at the octahedral and tetrahedral sites. Furthermore, the Co²⁺ ion substitution resulted in an increase in the dielectric properties of the Co _x Mn_1-xMn₂O₄ nanoparticles regarding with dipole moment. Interestingly, the increase was also influenced by reducing the particle size and crystal volume of the Co _x Mn_1-xMn₂O₄ nanoparticles.