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Ionics

, Volume 2, Issue 3–4, pp 179–183 | Cite as

Preparation, proton transport properties and use in gas sensors of thin films of zirconium phosphate with γ-layered structure

  • G. Alberti
  • M. Casciola
  • L. Massinelli
  • R. Palombari
Article

Abstract

Pellicular γ-zirconium phosphate (γ-ZP(p)), i.e. sheets made up entirely of oriented lamellae of Zr(PO4)(H2PO4)·2H2O (γ-ZP), have been obtained by filtering colloidal dispersions of exfoliated γ-ZP in water/acetone. The ac-conductivity of γ-ZP(p) and γ-ZP was measured in the temperature range 20/–20°C on samples previously conditioned at relative humidities between 90 and 5%. In both cases, the conductivity dependence on material hydration indicates the presence of a non-negligible bulk transport at low relative humidities. For each relative humidity the conductivity data have been parameterised on the basis of the Arrhenius equation. Activation energy and pre-exponential factor values suggest the presence of the same conduction mechanism in both materials. The conductivity of γ-ZP(p) measured by applying the electric field parallel to the sheets ranges from 3·10−4 to 1·10−5 S cm−1 for relative humidity decreasing from 90 to 11%, being an order of magnitude higher than that of γ-ZP. Since the pellicular and microcrystalline material have very similar surface areas (11–12 m2/g), the higher conductivity of γ-ZP(p) is mainly due to the preferred particle orientation parallel to the electric field.

Keywords

Relative Humidity Arrhenius Equation Colloidal Dispersion Proton Transport Field Parallel 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© IfI - Institute for Ionics 1996

Authors and Affiliations

  • G. Alberti
    • 1
  • M. Casciola
    • 1
  • L. Massinelli
    • 1
  • R. Palombari
    • 1
  1. 1.Department of ChemistryUniversity of PerugiaPerugiaItaly

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