Effect of Mg doping on the electrical, dielectric and relaxation properties of LiMnPO4 nanoparticles

LiMnPO4 and LiMn0.9Mg0.1PO4 nanostructures were synthesized by a rapid microwave-assisted solvothermal method. Powder X-ray diffraction (XRD) studies confirmed the orthorhombic crystal structure of LiMnPO4 and LiMn0.9Mg0.1PO4 nanostructures. It is also noticed that the Mg2+ ions doping into manganese sites did not affect the crystal structure of LiMnPO4. The scanning electron microscope (SEM) micrographs of LiMnPO4 and LiMn0.9Mg0.1PO4 showed the formation of nanoparticles with mixed morphology, i.e., spherical particle morphology and one-dimensional nanorod morphology. The LiMn0.9Mg0.1PO4 nanoparticles exhibited an improved electrical properties compared to that of LiMnPO4 nanoparticles. At room temperature, LiMn0.9Mg0.1PO4 nanoparticles exhibited an electrical conductivity of 3.705 × 10–7 S cm−1. The dielectric constant of LiMnPO4 and LiMn0.9Mg0.1PO4 nanostructures is high at low frequencies and decreases gradually towards high frequencies. The LiMnPO4 and LiMn0.9Mg0.1PO4 nanostructures are found to exhibit non-Debye-type relaxation behavior.