Abstract
We have prepared a series of double perovskites La2−xYxNiMnO6 (x = 0.0, 0.5, 1.0, 1.5, 2.0 mol%) by sol-gel method. The structural, optical and transport properties of La2−xYxNiMnO6 have been characterized by x-ray diffraction (XRD), Fourier transform infrared (FTIR) and ultra-violet (UV) visible spectroscopy at room temperature whereas dielectric and electrical properties are calibrated in the temperature range of 293–473 K. The structural properties are discussed by rietveld refinement (JANA software) which gives monoclinic structure with space group P21/n for all series. FT-IR measurements give IR spectra which are fitted by using Lorentz oscillator model, optical conductivity, oscillator strength and damping factors. UV-visible spectroscopy gives optical band gaps, indicating the semiconducting behavior of observed series. The transport characteristics of La2−xYxNiMnO6 have been found by dielectric and electrical measurements. The dielectric constant, tangent losses and ac conductivities as function of frequency and temperature have been discussed in detail. The activation energies are calculated by Arrhenius plot which inveterate the semiconducting nature of all samples. It has been further confirmed that there is small polaron hopping (SPH) conduction mechanism in all samples.
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