Abstract
The existence of a new high-pressure low-symmetry (HPLS) \(\hbox {ZrSiO}_4\) phase (space group \(I\bar{4}2d\)), which has been predicted by density-functional-theory (DFT) calculations (Stangarone et al. in Am Mineral, 2019b), is experimentally confirmed by in situ high-pressure Raman spectroscopic analysis up to 25.3 GPa. The new \(\hbox {ZrSiO}_4\) polymorph is developed from zircon via a soft-mode-driven displacive phase transition. The Cochran-law-type pressure dependency of the soft-mode wavenumber reveals a zircon-to-HPLS critical pressure \(p_{{\mathrm{c}}}\) = 20.98 ± 0.02 GPa. The increase in the phonon compressibilities of the zircon hard mode near \(\hbox {202 cm}^{-1}\) at \(p>p_{{\mathrm{r}}}=10.0\) GPa as well as of the reidite hard mode near \(\hbox {349 cm}^{-1}\) at \(p<p_{\mathrm {r}}\) marks the pressure above which zircon becomes thermodynamically metastable with respect to reidite; the experimentally determined value of \(p_{\mathrm {r}}\) is in good accordance with the equilibrium zircon–reidite transition pressure derived from DFT simulations. However, at room temperature, there is not enough driving force to rebuild the atomic linkages and the reconstructive transition to reidite happens \(\sim\) 1.4 GPa above \(p_{\mathrm {c}}\), indicating that at room temperature, the HPLS phase is a structural bridge between zircon and reidite. The pressure dependencies of the phonon modes in the range \(\hbox {350--460 cm}^{-1}\) reveal that the reconstructive phase transition in the \(\hbox {ZrSiO}_4\) system is triggered by energy resonance and admixture of hard modes from the parent and resultant phase.
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Acknowledgements
Financial support by the European Research Council (ERC grant 714936 to Matteo Alvaro, University of Pavia) and Deutsche Forschungsgesellschaft (MI 1127/7-2) is gratefully acknowledged. We thank Prof. Björn Winkler, Goethe-Universität Frankfurt, for the opportunity to use the He-gas loading setup available in his laboratory and Dr. Lkhamsuren Bayarjargal for help with gas loading.
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Mihailova, B., Waeselmann, N., Stangarone, C. et al. The pressure-induced phase transition(s) of \(\hbox {ZrSiO}_4\): revised. Phys Chem Minerals 46, 807–814 (2019). https://doi.org/10.1007/s00269-019-01041-1
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DOI: https://doi.org/10.1007/s00269-019-01041-1