Stability of NASICON materials against water and CO 2 uptake

Microstructure–conductivity relationship of Na3Zr2(SiO4)2(PO4) ceramics

“…This is not observed for samples sintered at 1250°C. This phenomenon is assumed to be a result of the absorption of water molecules in the samples with higher porosity, which are desorbed at a higher temperature and thus cause this deviation …”

Fast Na+ Ion Conduction in NASICON-Type Na3.4Sc2(SiO4)0.4(PO4)2.6 Observed by 23Na NMR Relaxometry

“…The 23 Na magic-angle spinning (MAS) NMR spectrum of the same sample shows only a single narrow Lorentzian contribution to the line shape (Figure S2). 31 At temperatures above 300 K, a clear so-called motional narrowing of the line shape, that is, an averaging of local environments around the Na nuclei caused by movement of the Na + ions and thus a decrease of the fwhm of the 23 Na NMR lineshapes, can be observed with a final line width of 2.5 kHz at 550 K (Figure 5). This is caused by movement of the Na + ions with average jump rates well above the line width of 18 kHz observed at low temperatures.…”

Engineering Materials for Progressive All-Solid-State Na Batteries

“…They also found that a black interlayer was formed when the pellet and Na were heated to 380 °C. Guillon et al 51 4A,B). 17,18 Large closo-borate anions remain translationally rigid and possess disordered lattices with a cation vacancy, which enables facile Na + hopping in the structure.…”

“…They also found that a black interlayer was formed when the pellet and Na were heated to 380 °C. Guillon et al studied the stability of NASICON Na 3.4 Sc 2 Si 0.4 P 2.6 O 12 against water and CO 2 . They recommend that Na 3.4 Sc 2 Si 0.4 P 2.6 O 12 as well as other NASICON samples should be stored in a glovebox and treatment above 600 °C can remove the water and CO 2 uptake of the sample.…”