Modified Pechini-type polymerizable precursor method has been used to prepare nanosized Li1-xTbxNiPO4 (x = 0, 0.03, 0.05, and 0.07) solid solutions to obtain homogeneous with controlled stoichiometry and smaller particle size. The reaction temperature was determined by thermogravimetric (TG/DTA) analysis. X-ray diffraction analysis reveals the formation of orthorhombic structure and the calculated crystallite sizes are found to be in the range of 75–89 nm. Morphological, compositional, and vibrational properties were performed by SEM, EDAX, and FTIR, respectively. Conductivity measurements were carried out at room temperature by AC impedance analysis. The Li0.97Tb0.03Ni0.99PO4 sample shows one order of higher conductivity than pure LiNiPO4. Higher concentration of terbium samples such as Li0.95Tb0.05Ni0.99PO4 and Li0.93Tb0.07Ni0.99PO4 lead to decrease of conductivity. The frequency dependency of dielectric permittivity, dielectric loss, and electric modulus of Li1-x TbxNiPO4 solid solutions are studied. The frequency-dependent plot of modulus reveals that the conductivity relaxation is of non-Debye type.
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K. Murugesan, Kadarkarai, G., Subramanian, Sa, Manavalan, P., and Parthasarathy, S. K., “Synthesis and characterization of Li1-xTbxNiPO4 solid solution as cathode materials for lithium ion battery application”, Ionics, pp. 1-9, 2016.