Structural, elemental, morphological, optical, vibrational and magnetic behaviour of Mg2+ doped La2CuO4 nanoparticles
摘要
The combustion method was used to prepare the Mg2+ substituted La2CuO4 nanocrystals (La2Cu1−xMgxO4, where x = 0, 0.1, 0.3, and 0.5). Through XRD and Rietveld refinements, it was confirmed that the presence of Mg2+ in La2CuO4 resulted in a secondary La2O3 phase. The nanostructures displayed an average crystallite size ranging from 27 to 40 nm. FT-IR spectra observed the stretching frequency of the sample. Because of the evolution of sub-bands, attributed to Mg2+ doping concentration, the energy gap values decrease from 1.75 to 1.78 eV. The sub-bands are computed with the help of the Kubelka–Munk (K–M) function. FE-SEM pictures revealed the characteristics of the grain boundaries of the nanoparticles. The EDX analysis validates the elemental mixing of Mg2+/Cu2+, La3+ and O2−. Magnetic measurements of undoped and Mg2+ doped La2CuO4 perovskite samples showed ferromagnetic behaviour at room temperature.