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Li3Fe2(PO4)3 is interesting because of its technological application and environmentally benign nature. Nanocrystalline Li3Fe2(PO4)3 is synthesized by a solution combustion technique. The role of fuels/complexing agents in deciding the structural parameters and ac electrical behavior is investigated in this study. Antiferromagnetic nature and direct bandgap energy of 3.09 eV are recognized in the material. Enhanced conduction is established through mobility of Li+ ion in four co-ordination in the modified monoclinic symmetry and high temperature stability through orthorhombic symmetry. Quality of electrical data is confirmed through a Kramers-Kronig test and electrical relaxation parameters are obtained from modulus analysis. Scaling analysis of modulus data confirmed the time-temperature superposition principle. [ABSTRACT FROM AUTHOR]

Highlights: [•] Solution combustion technique and preparation of nanocrystalline olivine materials. [•] Olivine type LiNiPO4 based nanocrystalline materials and characterization. [•] AC electrical studies on olivine type LiNi1−x M x PO4(M=Cu2+/Mg2+)based materials. [•] Enhancement of ionic conductivity in the nanocrystalline phase of LiNiPO4 material. [Copyright &y& Elsevier]

Abstract: A lithium-rich Li2NiZrO4 is synthesized by solution combustion technique in phase pure nanocrystalline form for the first time. The material is crystallized in the cubic structure of space group with lattice parameter: a =4.2457(3)Å and the average crystallites size is 55nm. Nanocrystalline nature of the sample is confirmed through transmission electron microscopy. Ac electrical properties are investigated and the activation energy for cross-over frequency is less than that of conduction as evident from Almond and West formalism. The conductivity and modulus formalisms provide nearly the same activation energies for electrical relaxation of mobile ions. The frequency dependent plots of M″ and Z″ show that the electrical relaxation is non-Debye in nature. The scaling behavior of M″ and Z″ formalisms confirmed the temperature independent nature of relaxation mechanism. [Copyright &y& Elsevier]