• M Ben Bechir

      Articles written in Bulletin of Materials Science

    • A.c. conductivity and dielectric study of LiNiPO4 synthesized by solid-state method

      M Ben Bechir A Ben Rhaiem K Guidara

      More Details Abstract Fulltext PDF

      LiNiPO4 compound was prepared by the conventional solid-state reaction. The sample was characterized by X-ray powder diffraction, infrared, Raman analysis spectroscopy and electrical impedance spectroscopy. The compound crystallizes in the orthorhombic system, space group 𝑃𝑛𝑚𝑎 with 𝑎 = 10.0252(7) Å, 𝑏 = 5.8569(5) Å and 𝑐 = 4.6758(4) Å. Vibrational analysis was used to identify the presence of PO$^{3-}_{4}$ group in this compound. The complex impedance has been measured in the temperature and frequency ranges 654–716 K and 242 Hz–5 MHz, respectively. The 𝑍' and 𝑍'' vs frequency plots are well-fitted to an equivalent circuit consisting of series of combination of grains and grain boundary elements. Dielectric data were analysed using complex electrical modulus 𝑀* for the sample at various temperatures. The modulus plots are characterized by the presence of two peaks thermally activated. The frequency dependence of the conductivity is interpreted in terms of equation: 𝜎_a.c.(𝜔) = [𝜎g/(1 + 𝜏2𝜔2) + (𝜎𝜏2𝜔2/1 + 𝜏2𝜔2) + A𝜔n]. The near values of activation energies obtained from the analysis of 𝑀", conductivity data and equivalent circuit confirms that the transport is through ion hopping mechanism dominated by the motion of Li+ in the structure of the investigated material.

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