The relative stability of spray-frozen/freeze-dried β″-Al2O3 powders

From High- to Low-Temperature: The Revival of Sodium-Beta Alumina for Sodium Solid-State Batteries

Conduction paths in sintered ionic conductive material Na1+xYxZr2−x(PO4)3

Fast ion conduction and phase transitions in various preparations of Na3Sc2P3O12

This paper discusses the measurement of ionic conductivity on polycrystalline pellets The complex impedance method seems to be the only one able to recover the actual value of the ohmic conductivity Its precision has been tested on polycrystalline pellets; it is not excellent but may be considered as acceptable

https://iopscience.iop.org/article/10.1209/0295-5075/8/5/009/pdf

Measurement of Ionic Conductivity in Solid Electrolytes

The polarization behavior of lithia-stabilized sodium ..beta..''-alumina in the form of polycrystalline pressed and sintered specimens was studied at 100 to 400/sup 0/C by observing the isothermal values of the complex admittance from approx. = 5 Hz to 500 kHz. Analyzing these data in the complex admittance plane in terms of an equivalent circuit for the system made it possible, when ion-blocking electrodes were used, to distinguish the separate contributions of the grain boundaries and the bulk crystals to the total electrolyte resistance. These results gave activation energies of 0.32 to 0.41 eV for the grain-boundary resistance and 0.11 to 0.14 eV for the bulk resistance. The prefactors in the Arrhenius expressions for these resistances appeared to be more sensitive to factors such as specimen composition, microstructure, and specimen preparation conditions than are the activation energies.

Analysis of Electrolyte Polarization in Polycrystalline Sodium β‐Alumina by a Complex Admittance Method

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Analysis of Electrolyte Polarization in Polycrystalline Sodium β‐Alumina by a Complex Admittance Method