Details

Autor(en) / Beteiligte

• Bandi, Suresh
• Srivastav, Ajeet K

Titel

Unveiling the crystallographic origin of mechanochemically induced monoclinic to triclinic phase transformation in WO3

Ist Teil von

• CrystEngComm, 2021-02, Vol.23 (8), p.1821-1827

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• This study reports the anomalously stabilized low-temperature triclinic phase (δ-WO3) during high energy ball milling (HEBM) of the monoclinic γ-WO3 phase. The transformation evidenced unit cell contraction with distorted structural parameters resulted in a lower symmetry phase. The phase transformation was understood to be HEBM-induced pressure/compression involved atomic displacement and octahedral tilting-driven polymorphic transition. The major distortion/cooperative octahedral tilting occurred on the (020) plane of γ-WO3 parallel to the b axis. The crystallographic origin of such distortions and unit cell compression mechanisms are explained further. The obtained δ-WO3 phase was stable at room temperature owing to its nanocrystalline structure (11 ± 6 nm) that limits reversible and forward transformations of δ-WO3 → γ-WO3 and γ-WO3 → ϵ-WO3, respectively.