The effect of anion substitution and nonstoichiometry on the fast ion conductor Cu 6PSe 5i

R. B. Beeken, A. T. Lintereur

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Abstract

Cu 6PSe 5I is a fast ion conductor exhibiting an order-of-magnitude change in electrical conductivity at its 265 K superionic-covalent phase transition. Replacing 5% of the selenide anions in this compound with sulfide results in a substantial enhancement of conductivity as well as a decrease in the phase transition temperature. Replacing 5% of the iodide anions with bromide produces a similar enhancement of conductivity, but has no effect upon the phase transition temperature. Introducing 2% halide vacancies into the Cu 6PSe 5I lattice via nonstoichiometric sample preparation has little effect upon the superionic conductivity, but significantly enhances conductivity and reduces activation energy in the covalent phase. Finally, the introduction of 1% vacancies into the chalcogenide sites via nonstoichiometric sample preparation shifts the superionic-covalent phase transition to higher temperatures.

Original languageEnglish (US)
Article number033522
JournalJournal of Applied Physics
Volume100
Issue number3
DOIs
StatePublished - Aug 25 2006

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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