Synthesis, electrical properties and Na+ migration pathways of Na2CuP1.5As0.5O7
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Date
2020-03-06
Journal Title
Journal ISSN
Volume Title
Publisher
MDPI
Abstract
A new member of sodium metal diphosphate-diarsenate, Na2CuP1.5As0.5O7, was synthesized as polycrystalline powder by a solid-state route. X-ray diffraction followed by Rietveld refinement show that the studied material, isostructural with β-Na2CuP2O7, crystallizes in the monoclinic system of the C2/c space group with the unit cell parameters a = 14.798(2) Å; b = 5.729(3) Å; c = 8.075(2) Å; β = 115.00(3)°. The structure of the studied material is formed by Cu2P4O15 groups connected via oxygen atoms that results in infinite chains, wavy saw-toothed along the [001] direction, with Na+ ions located in the inter-chain space. Thermal study using DSC analysis shows that the studied material is stable up to the melting point at 688 °C. The electrical investigation, using impedance spectroscopy in the 260–380 °C temperature range, shows that the Na2CuP1.5As0.5O7 compound is a fast-ion conductor with σ350 °C = 2.28 10−5 Scm−1 and Ea = 0.6 eV. Na+ ions pathways simulation using bond-valence site energy (BVSE) supports the fast three-dimensional mobility of the sodium cations in the inter-chain space. © MDPI
Description
Keywords
Crystal structure, Electrical properties, Polycrystals, Sodium, Oxygen, Impedance
Citation
ALQarni, O. S. A., Marzouki, R., Ben Smida, Y., Alghamdi, M. M., Avdeev, M., Belhadj Tahar, R., & Zid, M. F. (2020). Synthesis, electrical properties and Na+ migration pathways of Na2CuP1.5As0.5O7. Processes, 8(3), 305. doi:10.3390/pr8030305