High dielectric-energy storage and ferromagnetic-superparamagnetic properties: tetra-doping CuO nanocompositions

Abstract Tetra-doping by (Mn, Fe, Co, Ni) ions strongly boosted the room temperature dielectric constant and ferromagnetic-superparamagnetic characteristics of monoclinic CuO structure. In this study, undoped CuO, Cu 0.98 Mn 0.005 Fe Co Ni O, 0.96 0.01 O 0.94 0.015 nanocompositions were synthesized through coprecipitation technique. The crystal structure analysis verified that all samples have a pure single phase, corresponding to substitution 2+ -sites into lattice , 2+/3+ has been deduced from expansions constant, shifts XRD diffraction peaks band gap energy alteration. additions lead formation homogenous distributed very fine spherical nanoparticles, especially at large concentrations dopants (Cu sample). tetra-doping reduced intensity diffuse reflectance alongside red shifted absorption edge exhibits high relative permittivity value 6096 low frequency 42 Hz with small loss tangent (tan δ) compared one. induced excellent intrinsic ferromagnetic superparamagnetic hysteresis loops full saturation shape variable coercivity values.