Protonic conduction in LaPO4-based ceramics

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Significant protonic conduction has been found at high temperature in LaPO4-based ceramics, in which protons are considered to dissolve as defects in the presence of hydrogen-containing gases. This report describes electrolyte properties of 5mol% Sr-substituted LaPO4. In air, this material can be regarded as a pure protonic conductor at 600°C when PH(2)O > 1kPa, and at 700°C when PH(2)O > 3kPa. At high temperature, low PH(2)O, and high PO(2), the material shows mixed conduction by protons and electron holes. The contribution of electron hole conduction to the total conductivity becomes significant as temperature increases, PO(2) increases, and PH(2)O decreases, although protonic conduction is still dominant even at 900°C in wet air.

Original languageEnglish
Pages (from-to)207-211
Number of pages5
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Issue number3
Publication statusPublished - 1999 Mar
Externally publishedYes

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry


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