High-temperature protonic conduction in LaP3O9

Koji Amezawa, Yukinori Kitajima, Yoichi Tomii, Naoichi Yamamoto

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41 Citations (Scopus)


A novel proton-conducting material based on LaP3O9 was developed and its electrical conduction properties were investigated by measuring conductivities under 0.4-5 kPa of p(H2O) and 0.01-100 kPa of p(O2) at 573-973 K. LaP3O9 conducted protons dominantly by partial substitution of Sr for La. Conductivities of the 1 mol % Sr-doped LaP3O9 were 7 × 10-7 to 3 × 10-4 S cm-1 at 573-973 K, and were relatively higher than those of other proton-conducting rare earth phosphates such as LaPO4 and La7P3O18. Conductivities of the Sr-doped LaP3O9 were almost independent of p(H 2O), suggesting dominant protonic conduction even under low p(H 2O) conditions.

Original languageEnglish
Article number4
Pages (from-to)A511-A514
JournalElectrochemical and Solid-State Letters
Issue number12
Publication statusPublished - 2004


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