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Plasmonic-Active Nanostructured Thin Films
Open AccessArticle

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

1
Chemistry Department, College of Science, King Khalid University, Abha 61413, Saudi Arabia
2
Chemistry Department, Faculty of Sciences of Sfax, University of Sfax, Sfax 3038, Tunisia
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Laboratoire de Matériaux, Cristallochimie et Thermodynamique Appliquée, Faculté des Sciences de Tunis, Université de Tunis El Manar, El Manar II, Tunis 2092, Tunisia
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Laboratory of valorization of useful materials, National Center of Materials Sciences Research, Technopole Borj Cedria, BP 73, Soliman 8027, Tunisia
5
Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, Sydney 2234, Australia
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School of Chemistry, The University of Sydney, Sydney 2006, Australia
*
Author to whom correspondence should be addressed.
Processes 2020, 8(3), 305; https://doi.org/10.3390/pr8030305
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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MDPI and ACS Style

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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