Abstract
A novel proton-conducting material based on LaP 3 O 9 was developed and its electrical conduction properties were investigated by measuring conductivities under 0.4-5 kPa of p(H 2 O) and 0.01-100 kPa of p(O 2 ) at 573-973 K.LaP 3 O 9 conducted protons dominantly by partial substitution of Sr for La. Conductivities of the 1 mol % Sr-doped LaP 3 O 9 were 7 X 10 - 7 to 3 X 10 - 4 S cm - 1 at 573-973 K, and were relatively higher than those of other proton-conducting rare earth phosphates such as LaPO 4 and La 7 P 3 O 1 8 . Conductivities of the Sr-doped LaP 3 O 9 were almost independent of p(H 2 O), suggesting dominant protonic conduction even under low p(H 2 O) conditions.
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