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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.