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Interlayer Communication in Aurivillius Vanadate to Enable Defect Structures and Charge Ordering.

Yaoqing Zhang1,2, Takafumi Yamamoto2, Mark A Green3

  • 1Institute for Solid State Physics, University of Tokyo , Kashiwa, Chiba 277-8581, Japan.

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|October 27, 2015
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Summary

This study reveals complex phase transitions in bismuth vanadate (Bi3.6V2O10), detailing defect chemistry and polymorphism. These findings offer insights into fast oxide ion transport in layered materials.

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Crystallography

Background:

  • The fluorite-like [Bi2O2](2+) layer is a key structural motif in many layered compounds.
  • Aurivillius phases, such as Bi3.6V2O10, exhibit complex structural and electronic properties.

Purpose of the Study:

  • To comprehensively investigate the defect chemistry and polymorphism of Bi3.6V2O10.
  • To explore the implications of its structural behavior for fast oxide ion transport at lower temperatures.

Main Methods:

  • High-temperature X-ray diffraction to study phase transitions (γ, B, and A phases).
  • Quenching techniques to kinetically trap high-temperature phases (γ and B) at ambient temperature.
  • Analysis of defect chemistry, including bismuth vacancies and oxygen coordination changes.

Main Results:

  • Bi3.6V2O10 exhibits a high-temperature I4/mmm structure (γ-phase) tolerant to Bi vacancies.
  • Cooling induces phase transitions to an orthorhombic B-phase and an oxygen-vacancy ordered A-phase.
  • The A-phase shows a novel charge ordering of V(4+)/V(5+) cations with concomitant changes in oxygen coordination.
  • Kinetically trapped γ and B phases allow for ambient temperature structural analysis.
  • Interlayer diffusion of oxide anions in the γ-phase leads to compositional reshuffling.

Conclusions:

  • Bi3.6V2O10 displays intricate polymorphism and defect chemistry, crucial for understanding its properties.
  • The observed phase transitions and charge ordering offer new perspectives on ionic transport mechanisms.
  • Controlling polymorphism is key to tuning the material's potential for applications in oxide ion conductors.