Notizen: Mischkristallbildung und Natriumionenleitung im System Na₃PO₄/Na₂CO₃ / Solid State Miscibility and Sodium Ion Conduction in the System Na₃PO₄/Na₂CO₃

Abstract

Na3PO4 and Na2CO3 form solid solutions with the high-temperature Na3PO4 structure and a maximum content of nearly 25 mole-% Na2CO3 at 873 K and 15 mole-% at room temperature. The sodium ion conduction is enhanced due to the creation of sodium vacancies. In contrast to pure Na3PO4 there is a second order transition into the highly ionic conducting state. As a result of rotational disorder of the anions the activation energy is lowered.