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Proton conductivity in multi-component ABO4-type oxides.

Ashraf A A Elameen1,2, Arkadiusz Dawczak2, Tadeusz Miruszewski2

  • 1Department of Chemical and Physical Sciences, University of L'Aquila, L'Aquila, Italy.

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Summary
This summary is machine-generated.

Configurational entropy in oxides influences proton conductivity. Introducing more elements into LaNbO4 oxides enhanced proton transport, with a five-element composition showing the highest conductivity.

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Electrochemistry

Background:

  • Proton conductivity in oxides is crucial for energy applications.
  • Configurational entropy is a potential factor influencing ionic transport in materials.
  • Understanding the relationship between material composition and proton conductivity is essential for developing advanced ceramic electrolytes.

Purpose of the Study:

  • To investigate the effect of configurational entropy on proton conductivity in complex oxides.
  • To synthesize and characterize novel multi-element substituted A-site niobium oxides.
  • To evaluate the proton transport properties of these materials under varying atmospheric and temperature conditions.

Main Methods:

  • Synthesis of three novel A-site substituted ANbO4 oxides with increasing elemental complexity (5, 6, and 7 elements).
  • Characterization of the synthesized materials using techniques to confirm single-phase formation (monoclinic fergusonite structure).
  • Measurement of electrical conductivity in dry and wet atmospheres across a temperature range of 600-800 °C to determine proton conductivity.

Main Results:

  • All synthesized samples maintained a homogenous single-phase monoclinic fergusonite structure.
  • Proton conductivity was observed in all samples, evidenced by conductivity differences between dry and wet atmospheres.
  • The sample with five elements (La1/5 Nd1/5 Sm1/5 Gd1/5 Eu1/5NbO4) exhibited the highest proton conductivity, reaching approximately 3.0 × 10^-6 S cm^-1 at 800 °C in a wet atmosphere.

Conclusions:

  • Increasing configurational entropy through multi-element substitution in ANbO4 oxides can positively influence proton conductivity.
  • The synthesized complex oxides demonstrate modest proton conductivity, suggesting potential for further optimization.
  • This study highlights the importance of compositional disorder in designing proton-conducting ceramic materials.