Probing disorder in high-pressure cubic tin (IV) oxide: a combined X-ray diffraction and absorption study

Sneed, D.; Kearney, J.S.C.; Smith, D.; Smith, J.S.; Park, C.; Salamat, A.

doi:10.1107/S1600577519003904

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Figure 2
XRD of SnO₂ under pressure. (a) (Blue) Cubic ( $[Pa\bar{3}]$ , green ticks) and orthorhombic (Pnnm, red ticks) phases of SnO₂ coexisting on room-temperature compression in quasi-hydrostatic Ne at 44.5 GPa, well within the stability region of the $[Pa\bar{3}]$ phase. (Red) $[Pa\bar{3}]$ SnO₂ following laser heating to 2648 ± 41 K, with no remnants of the Pnnm phase and significantly reduced peak widths. Blue asterisks (*) denote reflections from Ne, and red asterisks those from KBr. (b) Pressure evolution of select Bragg reflections from $[Pa\bar{3}]$ SnO₂ from its formation at 17.5 GPa. The effect of thermal annealing is evident in the sharpening of peaks, particularly at high-q. Each pattern was collected at 300 K, the legend denotes pressure condition and annealing temperature. (c) Rietveld refinement of laser-annealed $[Pa\bar{3}]$ SnO₂ at 44.5 GPa at room temperature (R_P = 1.177%, R_WP = 2.89%).

JOURNAL OF
SYNCHROTRON
RADIATION

ISSN: 1600-5775

Volume 26| Part 4| July 2019| Pages 1245-1252

https://doi.org/10.1107/S1600577519003904

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