Protonic conduction in Sr-doped (La1-xSmx)PO 4

N. Kitamura, K. Amezawa, Y. Tomii, N. Yamamoto, T. Hanada

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21 Citations (Scopus)


High temperature protonic conduction in 1 mol% Sr-doped (La 1-xSmx)PO4 (x=0.3, 0.5 and 0.7) with the monazite structure (S. G.: P21/n) was investigated. The conductivities of the materials under wet atmosphere were considerably higher than those under dry atmosphere. From the conductivity measurements under H 2O- and D2O-containing atmospheres, it was found that the magnitude of H/D isotope effect was 1.2-1.4. These results indicated that protonic conduction was dominant in the materials under wet atmosphere. The p(H2U) dependencies of the conductivities were discussed in terms of the defect equilibria, and, as a result, higher Sm content in 1 mol% Sr-doped (La1-xSmx)PO4 seemed more preferable for proton dissolution.

Original languageEnglish
Pages (from-to)563-567
Number of pages5
JournalSolid State Ionics
Issue number1-4
Publication statusPublished - 2004 Nov 30
EventFourteenth International Conference on Solid State Ionics - Monterey, CA., United States
Duration: 2003 Jun 222003 Jun 27


  • Defect equilibrium
  • Monazite
  • Protonic conduction
  • Rare earth orthophosphate


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