Abstract
Synchrotron X-ray powder diffraction experiments were performed on natural pollucite to observe its transition into hexacelsian-like phase at high pressure and temperature conditions under water pressure medium. When heated to 100 °C at 1.3(1) GPa, the natural cubic pollucite, (Cs, Na)16Al16Si16O96 (Ia \(\overline{3 }\) d), transformed to its triclinic phase (P \(\overline{1 }\)) with discontinuous unit cell volume contraction by ca. 4.4%. After further compression to 4.1(1) GPa and heating up to 250 °C, a new hexagonal phase with a hexacelsian framework, Cs1.28(1)Na0.44(1)Al1.72(1)Si6.28(1)O16 (P63/mcm, (Cs, Na)-HEX), formed with unit cell volume contraction by ca. 6.1% based on 96 oxygen atoms of the framework (Of). The structural model of the newly formed hexacelsian-like phase, (Cs, Na)-HEX, was refined by the Rietveld method to show the disordered distribution of cesium and sodium cations between the double six-membered rings (D6R). Further details of the (Cs, Na)-HEX model are compared to those of the natural Ba-hexacelsian (Ba-HEX) and synthetic Cs-hexacelsian (Cs-HEX).
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Acknowledgements
The X-ray experiment was performed at the beamline 10C at PLS-II funded by the Korean Ministry of Science and ICT (MSIT). This work was supported by the Leader Researcher program (NRF‐2018R1A3B1052042) of MSIT.
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This article is part of a Topical Collection “Experimental & Analytical Techniques at Extreme & Ambient Conditions”, guest edited by Stella Chariton, Vitali B. Prakapenka and Haozhe (Arthur) Liu.
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Choi, W., Choi, J., Hwang, H. et al. Transformation of natural pollucite into hexacelsian under high pressure and temperature. Phys Chem Minerals 49, 15 (2022). https://doi.org/10.1007/s00269-022-01190-w
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DOI: https://doi.org/10.1007/s00269-022-01190-w