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Sodium ion-conducting solid electrolytes in the system Na3PO4Na2SO4

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Author(s)

J. T.S. Irvine, A. R. West

School/Research organisations

Abstract

In the system Na3PO4Na2SO4, the high-temperature, cubic γ form of Na3PO4 forms an extensive range of solid solutions: Na3-x(P1-xSx)O4, 0 < x < (0.57 to 0.70, depending on temperature). For compositions in the range x = ca. 0.33 to 0.57, these γ solid solutions are thermodynamically stable at all temperatures. The conductivity of the γ solid solutions increases with increasing x and reaches a maximum at x = 0.5 to 0.6, with values of 2 × 10-5 ohm-1 cm-1 at 100°C, rising to 1.3 × 10-2 ohm-1 cm-1 by 300°C; this conductivity increase with x is attributed to an increase in the sodium ion vacancy concentration, associated with the solid solution mechanism Na + PS. The phase diagram for the system Na3PO4Na2SO4 is given together with lattice parameters of the γ solid solutions.

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Original languageEnglish
Pages (from-to)126-134
Number of pages9
JournalJournal of Solid State Chemistry
Volume69
Issue number1
DOIs
Publication statusPublished - Jul 1987

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