Sodium super-ionic conductors

Monophosphate tungsten bronzes with pentagonal tunnels NASICON = Sodium super ionic conductor NLO = Nonlinear Optical PLZT = Lead lanthanum zirconium titanate PZT = Lead zirconium titanate SBT = Strontium Bismuth Tantalate, SrBi2Ta209 SOFC = Solid oxide fuel cell TTB = Tetragonal tungsten bronze YAG = Yttrium iron garnet 3D = Three-dimensional TEOS = Tetraethylorthosilicate. 

Ceramics, like NASICON (sodium super ionic conductor) prepared by the sol-gel method, were found to give selective potentiometric response toward various cations. Selectivity is provided by the... 

UPON lithium phosphorus oxynitride, NASICON sodium super-ionic conductor Source Data from Park et al. (2003), Iwahara (2009), etc. 

It is the purpose of this paper to suggest a simple model for the metal-super ionic conductor interphase which can explain some of the experimental observations which have been made on these systems. The model is essentially a refinement of one discussed earlier (1). Super ionic conductors are taken to be (typically) sodium 3 Al203 and Agi+Rbl5, i.e. solids which have very high ionic conductivities (up to 10 0. cm" ), negligible electronic conductivities and very high concentrations of mobile species ( 10 mol 1" ). In what follows it will be assumed initially that the solid consists of immobile anions and cations which are all equivalent and all mobile. 

Materials of composition Nai+ Zr2P3 Si (Oi2 (0 < X < 3) are known as Na super-ionic conductors (NASICON) and also have potential application in sodium/ sulfur batteries. They comprise solid solutions of NaZr2(P04)3 (the host lattice) and Na4Zr2(Si04)3. The... 

As discussed in Chapter 5, LiFeP04 is a widely used phosphate positive electrode. In this section, other kinds of phosphates, mostly based on LiMnP04, are discussed. The complex phosphate Li3Fe2(P04)3 has a sodium (Na) Super Ionic CONductor (NASICON) structure. The cyclic voltammogram ( ) curve shows two plateaus during the charge and discharge processes, at 2.80 and 2.65 V, with a reversible capacity of up to 1.5-1.6 Li per unit. Since very little is known about this material, it will not be discussed further. 

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