Abstract
LiNi1 − x M x PO4 (M = Zn, Al and x = 0, 0.05, 0.10, 0.15, and 0.20) was synthesized by classical solid-state reaction method. The reaction temperature is determined by thermogravimetric analysis. X-ray diffraction patterns show that an impurity peak is absorbed for Al3+-doped samples but not in the case of Zn2+-doped samples. Laser Raman studies confirm that phase pure LiNiPO4 is formed and the dopant is entered into the host lattice. Impedance spectroscopy is used to study the ion dynamics of both doped and undoped systems. Higher DC conductivity value is observed for LiNi0.85Zn0.15PO4 and LiNi0.925Al0.05PO4 compared with pristine LiNiPO4. The temperature-dependent DC conductivity and the frequency-dependent dielectric loss maxima are found to obey the Arrhenius law of conduction. In the modulus analysis, the stretching exponent β is found to be temperature independent. The scaling behavior of the imaginary part of the electric modulus suggests that the relaxation mechanism is independent of temperatures. Electrochemical impedance spectroscopy (EIS) studies also show that electrical conductivity is increased upon Zn2+ and Al3+ doping.
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The financial support from BRNS, Government of India, DAE, research project 2010/20/37P/3/BRNS/1062 is gratefully acknowledged. One of the authors (S. Karthickprabhu) thanks the BRNS, DAE, Government of India, for the award of Senior Research Fellowship.
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Karthickprabhu, S., Hirankumar, G., Maheswaran, A. et al. Influence of metals on the structural, vibrational, and electrical properties of lithium nickel phosphate. Ionics 21, 345–357 (2015). https://doi.org/10.1007/s11581-014-1192-2
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DOI: https://doi.org/10.1007/s11581-014-1192-2