The discovery of TiO2-II, the α-PbO2-structured high-pressure polymorph of rutile, in the Suizhou L6 chondrite

Xie, Xiande; Gu, Xiangping; Chen, Ming

doi:10.1007/s11631-022-00585-4

Cited by 4 publications

(1 citation statement)

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“…The α-PbO2 structure is common to binary oxides, typically as a high-pressure phase accessible via compression pathways from the rutile or CaCl2 structures [1]. In TiO2, α-PbO2-type ‘TiO2–II’ has been discovered in impact craters and meteorites [44,45], or can be synthesized by ball milling anatase-type TiO2 [46]. Although reported in SnO2 [2–5], the phase has never been observed in isolation from other structures.…”

Section: High-pressure Polymorphism Of Normalsno2mentioning

confidence: 99%

Stable and metastable structures of tin (IV) oxide at high pressure

Sneed,

Smith,

Kearney

et al. 2023

Phil. Trans. R. Soc. A.

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We have analysed SnO 2 with a combination of synchrotron X-ray diffraction and X-ray absorption spectroscopy across a pressure range of 0 → 82.9 GPa with thermal annealing by a CO 2 laser allowing access to all of the known high-density polymorphs of SnO 2 , and here report their crystallographic information. The metastability of the post-rutile α - PbO 2 and PdF 2 structures in SnO 2 are investigated by experiment and PW-DFT simulations, revealing a complex energetic landscape and suggesting a significant dependence of the observed phases on the pressure–temperature pathway taken in experiment. This article is part of the theme issue ‘Exploring the length scales, timescales and chemistry of challenging materials (Part 1)’.

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