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Hydration significantly increases grain boundary resistivity in Sm(0.15)Ce(0.85)O(1.925) by altering space-charge potentials. This finding impacts understanding of water effects on ceramic transport properties.

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Electrochemistry

Background:

  • Microcrystalline Sm(0.15)Ce(0.85)O(1.925) is a ceramic material with potential applications in solid oxide fuel cells.
  • Understanding the influence of environmental factors like hydration on its transport properties is crucial for optimizing performance.

Purpose of the Study:

  • To investigate the impact of hydration on the electrical transport properties of microcrystalline Sm(0.15)Ce(0.85)O(1.925).
  • To elucidate the mechanism behind observed changes in conductivity under humidified conditions.

Main Methods:

  • Conventional ceramic processing to obtain dense polycrystalline samples.
  • High-resolution transmission electron microscopy (HRTEM) to analyze grain boundary structure.
  • Impedance spectroscopy over a range of temperatures and atmospheres (dry, H2O-saturated, D2O-saturated synthetic air, and H2-H2O).

Main Results:

  • Humidification (H2O or D2O) substantially increased grain boundary resistivity while leaving bulk properties unchanged.
  • The observed changes in resistivity were reversible and reproducible.
  • Space-charge potential increased by 5-7 mV under humidification, leading to oxygen vacancy depletion and reduced grain boundary conductivity.

Conclusions:

  • The space-charge model adequately explains the observed hydration effects on grain boundary conductivity.
  • Water uptake into the grain boundary core alters the energetics of vacancy creation, increasing space-charge potential.
  • Negligible bulk water uptake was observed under both oxidizing and reducing conditions.