caa a22 4500 606181768 CHVBK 20210128100812.0 cr unu---uuuuu 210128e20150701xx s 000 0 eng 10.1007/s10876-014-0812-3 doi (NATIONALLICENCE)springer-10.1007/s10876-014-0812-3 Infra-red, NMR Spectroscopy and Transport Properties of Diphosphate NaAlP2O7 [Elektronische Daten] [Y. Ben Taher, R. Hajji, A. Oueslati, M. Gargouri] The sodium aluminum diphosphate compound has been synthesized by the classic ceramic method and characterized by X-ray diffraction technique, IR, 31P NMR, 23Na NMR and impedance spectroscopy. It crystallizes in monoclinic space group P21/c . The MAS-NMR spectra showed two and one isotropic resonances relatives to 31P and 23Na, respectively, revealing the existence of two phosphorus and one sodium environments in the structure. The electrical properties of this compound have been measured in the temperature range from 523 to 673K and the frequency range from 209Hz to 5MHz. The Nyquist plots are fitted to an equivalent circuit modeled by a combination series of two parallel (R//C) and (R//CPE). Impedance measurements show NaAlP2O7 an ionic conductor being the conductivity 1.16×10−5Ωcm−1 at 613K and Ea is 0.95eV. The conductivity provide nearly the same activation energies for electrical relaxation of mobile ions revealing that transport properties in this material appear to be due to an ionic hopping mechanism dominated by the motion of the Na+ ions along [101] tunnels direction presented in the structure of the investigated material. The peak positions ωp of M″ spectra shift toward higher frequencies with increase in temperature. Springer Science+Business Media New York, 2014 Ceramics nationallicence Chemical synthesis nationallicence X-ray diffraction nationallicence Electrical conductivity nationallicence Nuclear magnetic resonance (NMR) nationallicence Ben Taher Y. Condensed Matter Laboratory, Faculty of Sciences, University of Sfax, B.P. 1171, 3000, Sfax, Tunisia aut Hajji R. Condensed Matter Laboratory, Faculty of Sciences, University of Sfax, B.P. 1171, 3000, Sfax, Tunisia aut Oueslati A. Condensed Matter Laboratory, Faculty of Sciences, University of Sfax, B.P. 1171, 3000, Sfax, Tunisia aut Gargouri M. Condensed Matter Laboratory, Faculty of Sciences, University of Sfax, B.P. 1171, 3000, Sfax, Tunisia aut Journal of Cluster Science Springer US; http://www.springer-ny.com 26/4(2015-07-01), 1279-1294 1040-7278 26:4<1279 2015 26 10876 https://doi.org/10.1007/s10876-014-0812-3 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10876-014-0812-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ben Taher Y. Condensed Matter Laboratory, Faculty of Sciences, University of Sfax, B.P. 1171, 3000, Sfax, Tunisia aut NATIONALLICENCE 700 1- Hajji R. Condensed Matter Laboratory, Faculty of Sciences, University of Sfax, B.P. 1171, 3000, Sfax, Tunisia aut NATIONALLICENCE 700 1- Oueslati A. Condensed Matter Laboratory, Faculty of Sciences, University of Sfax, B.P. 1171, 3000, Sfax, Tunisia aut NATIONALLICENCE 700 1- Gargouri M. Condensed Matter Laboratory, Faculty of Sciences, University of Sfax, B.P. 1171, 3000, Sfax, Tunisia aut NATIONALLICENCE 773 0- Journal of Cluster Science Springer US; http://www.springer-ny.com 26/4(2015-07-01), 1279-1294 1040-7278 26:4<1279 2015 26 10876