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. 2023 Sep 20;20(206):20230386. doi: 10.1098/rsif.2023.0386

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© 2023 The Author(s)

Published by the Royal Society. All rights reserved.

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Figure 3. — XRD and TEM of GR transformation products. (a) XRD diffractograms of the mineral species produced following the exposure of GRCO₃ to pressurized CH₄/O₂ atmospheres. Magnetite (Fe₃O₄) and lepidocrocite (γ-FeO(OH)) were the primary transformation products of GR corresponding to low (approx. 0.1 bar) and high (greater than 0.1 bar) O₂ content, respectively. Partially transformed products are displayed below the primary product, with the residual GR's low 2θ d-spacing listed adjacent. (b) The corresponding SEM images of the pure mineral phases characterized in (a).