Humidity-Sensitive Characteristics of PbCrO₄-PbO Thick Film Elements

Abstract

The humidity-sensitive characteristics in the system PbCrO₄ combined with various oxides such as M₂O₃ (M=AI, Fe), M'O₂ (M'=Zr, Sn, Ti, Th) and M"₂O₅ (M"=Ta) depend on the host composition which is PbCrO₄ or Pb₂CrO₅.
In the system PbCrO₄-PbO, the effect of composition and microstructure on the humidity-sensitive characteristics of thick film elements were examined to confirm the predominant phase over elements.
The sensitivity in low humidity region increased as the host composition of elements changed from hydrophobic PbCrO₄ to hydrophilic Pb₂CrO₅. These results were interpreted by a humidity-sensitive mechanism proposed for hydrophilic Pb₂CrO₅.