4.6 Article

Insights into the TT-Nb2O5 crystal structure behavior

Journal

MATERIALS LETTERS
Volume 318, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.matlet.2022.132136

Keywords

Niobium pentoxide; Powder diffraction; Crystal structure; TT-Nb2O5; Rietveld refinement

Funding

  1. CAPES [2032/2014]
  2. CNPq [142398/2017-9, 311588/218-2]
  3. FAPEMIG [APQ03191-18]

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This study presents insights into the crystal structure of the TT-phase of Nb2O5, revealing a pseudohexagonal unit cell and a tunnel-like structure of 4 angstrom along the b-axis.
The discussion about the Nb2O5 crystal structure persists nowadays, especially for the TT-phase. It has been shown that the TT-phase can accommodate defects in the crystal structure due to its opened structure and non-stoichiometry behavior. Several works suggested that the TT-phase could crystallize in monoclinic, hexagonal, pseudohexagonal, or orthorhombic structures. For this reason, this work presents insights about the TT-phase crystal structure, which presented a pseudohexagonal unit cell within a disordered orthorhombic superlattice, showing a tunnel-like structure of 4 angstrom along the b-axis.

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