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High-Pressure Polymorph of NaBiO3.

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A new hexagonal high-pressure sodium bismuthate (NaBiO3) polymorph, β-NaBiO3, was synthesized. This new phase exhibits no photocatalytic activity for phenol decomposition, unlike its parent compound.

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Crystallography

Background:

  • Sodium bismuthate (NaBiO3) is known for its photocatalytic properties.
  • High-pressure synthesis can yield novel material polymorphs with unique characteristics.

Purpose of the Study:

  • To synthesize and characterize a new high-pressure polymorph of NaBiO3.
  • To investigate the structural and photocatalytic properties of the new phase.
  • To compare the properties of the new polymorph with the parent compound.

Main Methods:

  • High-pressure synthesis at 6 GPa and 600 °C.
  • Powder X-ray diffraction for phase identification and indexing.
  • Synchrotron X-ray diffraction for crystal structure refinement.
  • First-principles density functional theory calculations for electronic structure.

Main Results:

  • A new hexagonal polymorph, β-NaBiO3, was successfully synthesized.
  • The crystal structure was determined and found to be related to Ba2SrY6O12.
  • β-NaBiO3 showed no photocatalytic activity for phenol decomposition under visible light.
  • The optical band-gap energy of β-NaBiO3 is narrower than that of NaBiO3.

Conclusions:

  • The high-pressure synthesis yielded a novel NaBiO3 polymorph with distinct structural and electronic properties.
  • The absence of photocatalytic activity in β-NaBiO3 is attributed to its electronic structure, despite a narrower band gap.
  • This study expands the understanding of NaBiO3 polymorphism and its structure-property relationships.