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Ionic conduction and dielectric properties of yttrium doped LiZr2(PO4)3 obtained by a Pechini-type polymerizable complex route |
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| Authors: | CR Mariappan P Kumar A Kumar S Indris H Ehrenberg G Vijaya Prakash R Jose |
| Affiliation: | 1. Department of Physics, National Institute of Technology, Kurukshetra, Haryana 136119, India;2. School of Materials Science and Technology, National Institute of Technology, Kurukshetra, Haryana 136119, India;3. Institute for Applied Materials (IAM), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany;4. Nanophotonics Laboratory, Department of Physics, Indian Institute of Technology-Delhi, New Delhi 110016, India;5. Nanostructured Renewable Energy Materials Laboratory, Faculty of Industrial Sciences & Technology, Universiti Malaysia Pahang, 26300 Kuantan, Malaysia |
| Abstract: | We report on the ion transport properties of Li1+xZr2-xYx(PO4)3 (0.05?≤ x?≤?0.2) NASICON type nanocrystalline compounds prepared through a Pechini-type polymerizable complex method. Structural properties were characterized by means of powder X-ray diffraction, Raman spectroscopy and electron microscopy with selected area electron diffraction. Impedance spectroscopy was utilised to investigate the lithium ion transport properties. Y3+ doped LiZr2(PO4)3 compounds showed stabilized rhombohedral structure with enhanced total ionic conductivity at 30?°C from 2.87?×?10?7 S?cm?1 to 0.65?×?10?5 S?cm?1 for x=0.05 to 0.20 respectively. The activation energies of Li1+xZr2-xYx(PO4)3 show a decreasing trend from 0.45?eV to 0.35?eV with increasing x from 0.05 to 0.20. The total conductivity of these compounds is thermally activated, with activation energies and pre-exponential factors following the Meyer-Neldel rule. The tanδ peak position shifts to the high-frequency side with increasing yttrium content. Scaling in AC conductivity spectra shows that the electrical relaxation mechanisms are independent of temperature. |
| Keywords: | Lithium ionic conductor Impedance spectroscopy Activation energy AC conductivity Dielectric properties |
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