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Plasmonic-Active Nanostructured Thin Films
Open AccessArticle

Synthesis, Electrical Properties and Na+ Migration Pathways of Na2CuP1.5As0.5O7

Chemistry Department, College of Science, King Khalid University, Abha 61413, Saudi Arabia
Chemistry Department, Faculty of Sciences of Sfax, University of Sfax, Sfax 3038, Tunisia
Laboratoire de Matériaux, Cristallochimie et Thermodynamique Appliquée, Faculté des Sciences de Tunis, Université de Tunis El Manar, El Manar II, Tunis 2092, Tunisia
Laboratory of valorization of useful materials, National Center of Materials Sciences Research, Technopole Borj Cedria, BP 73, Soliman 8027, Tunisia
Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, Sydney 2234, Australia
School of Chemistry, The University of Sydney, Sydney 2006, Australia
Author to whom correspondence should be addressed.
Processes 2020, 8(3), 305;
Received: 10 February 2020 / Revised: 1 March 2020 / Accepted: 3 March 2020 / Published: 6 March 2020
(This article belongs to the Special Issue Materials Processing for Production of Nanostructured Thin Films)
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. View Full-Text
Keywords: diphosphate-diarsenate; crystal structure; electrical properties; transport pathways simulation diphosphate-diarsenate; crystal structure; electrical properties; transport pathways simulation
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ALQarni, O.S.A.; Marzouki, R.; Ben Smida, Y.; Alghamdi, M.M.; Avdeev, M.; Belhadj Tahar, R.; Zid, M.F. Synthesis, Electrical Properties and Na+ Migration Pathways of Na2CuP1.5As0.5O7. Processes 2020, 8, 305.

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