This article is cited in 2 papers

Lattice dynamics

Potassium cation conduction in K$_{3-2x}$Pb$_x$PO$_4$ solid solutions

E. I. Burmakin, G. Sh. Shekhtman

Institute of High-Temperature Electrochemistry, RAS, Ekaterinburg

Abstract: New materials of the K$_{3-2x}$Pb$_x$PO$_4$ system with high potassium-cation conductivity have been synthesized and studied. It has been found that the introduction of Pb$^{2+}$ cations substantially increases the conductivity of K$_3$PO$_4$ due to the formation of potassium vacancies and the stabilization of the high-temperature cubic structure of the orthophosphate. At low temperatures, the maximum conductivity has been observed in the composition range $x$ = 0.15–0.20 and varies from $\sim$ 10$^{-2}$ S cm$^{-1}$ at 400$^\circ$C to $\sim$ 10$^{-1}$ S cm$^{-1}$ at 700$^\circ$C. The factors influencing the transport properties of the materials under study have been discussed.

Received: 26.12.2013

 English version: Physics of the Solid State, 2014, 56:6, 1224–1227

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