Humidity sensor with sintered β-Ca(PO3)2 for high temperature use

M. Greenblatt, P. P. Tsai, T. Kodama, S. Tanase

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A galvanic cell-type humidity sensor has been constructed from sintered β-Ca(PO3)2 which is a proton conductive solid. The EMF response as a function of the logarithm of water vapor is linear, reversible, reproducible, and very fast over a wide range of vapor pressure measured at 578, 678 and 776°C, respectively. The variation of observed EMF versus logarithm of water vapor is in good agreement with the theoretical EMF expected from the Nernst equation. Experimental results of steam-oxygen and steam-hydrogen concentration cells respectively employing β-Ca(PO3)2 as an electrolyte confirm proton conductivity and suggest the potential application of this material for high temperature galvanic cell-type humidity sensing.

Original languageEnglish (US)
Pages (from-to)444-447
Number of pages4
JournalSolid State Ionics
Issue numberPART 1
Publication statusPublished - Aug 1990


All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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