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- W4210361379 abstract "Identifying the factors influencing the movement of sodium cations (Na + ) in glasses accelerates the possible options of glass-based solid electrolyte materials for their applications as a promising electrolyte material in sodium-ion batteries. Nevertheless, due to the poor correlation between the structure and conductivity in glass materials, identifying the factors governing the conductivity still exists as a challenging task. Herein, we have investigated the DC-conductivity variations by correlating the structure and conductivity in sodium superionic conductor (NASICON) based Na 3 Al 2 P 3 O 12 (NAP) glass (mol%: 37.5 P 2 O 5 —25.0 Al 2 O 3 —37.5 Na 2 O) due to the successive substitution of Na 2 SO 4 for Al 2 O 3 . Structural variations have been identified using the Raman and magic-angle spinning nuclear magnetic resonance (MAS-NMR) (for 31 P, 23 Na, and 27 Al nuclei) and conductivity measurements have been done using the impedance spectroscopy. From the ac-conductivity spectra, the correlations between mean square displacement (MSD) and dc-conductivity and between the Na + concentration and dc-conductivity have also been evaluated. Raman spectra reveal that the increase in the Na 2 SO 4 concentration increases the number of isolated SO 4 2− sulfate groups that are charge compensated by the Na + cations in the NAP glass. MAS-NMR spectra reveal that the increase in Na 2 SO 4 concentration increases the concentration of non-bridging oxygens and further neither S-O-P nor S-O-Al bonds are formed. Impedance spectroscopy reveals that, at 373 K, the DC conductivity of the NAP glass increases with increasing the Na 2 SO 4 up to 7.5 mol% and then decreases with the further increase. In the present study, we have shown that the mobility of sodium cations played a significant role in enhancing the ionic-conductivity. Further, we have shown that inter-ionic Coulombic interactions and the structural modification with the formation of SO 4 2− units significantly influence the critical hopping length < R 2 (t p )> of the sodium cations and consequently the mobility and the ionic conductivity. The present study clearly indicates that, based on the compositions, glass materials can also be treated as strong-electrolyte materials." @default.
- W4210361379 created "2022-02-08" @default.
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- W4210361379 date "2022-01-27" @default.
- W4210361379 modified "2023-10-16" @default.
- W4210361379 title "Structure and Conductivity Correlation in NASICON Based Na3Al2P3O12 Glass: Effect of Na2SO4" @default.
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- W4210361379 doi "https://doi.org/10.3389/fmats.2021.802379" @default.
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