Structural and electrical characterization of La2ZnMnO6 double perovskite

Polycrystalline La2ZnMnO6 (LZM) compound was synthesized successfully by solid state reaction route with single phase orthorhombic structure (Pnma space group) as revealed by X-ray diffraction analysis. The microstructure of LZM has inhomogeneous distributions of grains and average grain size is varying from 0.05 to 5.0 μm. EDAX survey showed Zn rich lines with an uneven distribution of the atoms. Peaks in Raman spectrum of LZM compound correspond to MnO bond stretching and tilt of the MnO octahedral. The dielectric behavior of ceramics in lower frequency regions exclusively depends on grain boundary effect. The temperature dependent dielectric loss study shows relaxation peaks dominating at lower frequencies and shifted towards higher temperature range with increasing frequency. The strong influence of non-Debye type relaxation is confirmed by Bergman fitting to experimentally observe electric modulus curve. VRH model has been used to study conduction behavior of the sample.