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Vibrational and Thermodynamic Properties of Hydrous Iron-Bearing Lowermost Mantle Minerals

Phase Transitions in Natural Vanadinite at High Pressures

School of Gemmology, China University of Geosciences, Beijing 100083, China
Hawaii Institute of Geophysics and Planetology, University of Hawaii at Manoa, Honolulu, HI 96822, USA
Gemmological Institute, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
Argonne National Laboratory, Center for Advanced Radiation Sources, University of Chicago, Lemont, IL 60439, USA
Authors to whom correspondence should be addressed.
Academic Editors: Anna Pakhomova and Ilya Kupenko
Minerals 2021, 11(11), 1217;
Received: 23 August 2021 / Revised: 25 October 2021 / Accepted: 28 October 2021 / Published: 31 October 2021
(This article belongs to the Special Issue Minerals under Extreme Conditions)
The structural stability of vanadinite, Pb5[VO4]3Cl, is reported by high-pressure experiments using synchrotron radiation X-ray diffraction (XRD) and Raman spectroscopy. XRD experiments were performed up to 44.6 GPa and 700 K using an externally-heated diamond anvil cell (EHDAC), and Raman spectroscopy measurements were performed up to 26.8 GPa at room temperature. XRD experiments revealed a reversible phase transition of vanadinite at 23 GPa and 600 K, which is accompanied by a discontinuous volume reduction and color change of the mineral from transparent to reddish during compression. The high-pressure Raman spectra of vanadinite show apparent changes between 18.0 and 22.8 GPa and finally become amorphous at 26.8 GPa, suggesting structural transitions of this mineral upon compression. The structural changes can be distinguished by the emergence of a new vibrational mode that can be attributed to the distortion of [VO4] and the larger distortion of the V–O bonds, respectively. The [VO4] internal modes in vanadinite give isothermal mode Grüneisen parameters varying from 0.149 to 0.286, yielding an average VO4 internal mode Grüneisen parameters of 0.202. View Full-Text
Keywords: X-ray diffraction; Raman spectroscopy; high pressure and high temperature; apatite group X-ray diffraction; Raman spectroscopy; high pressure and high temperature; apatite group
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MDPI and ACS Style

Liu, Y.; Dai, L.; Lai, X.; Zhu, F.; Zhang, D.; Hu, Y.; Tkachev, S.; Chen, B. Phase Transitions in Natural Vanadinite at High Pressures. Minerals 2021, 11, 1217.

AMA Style

Liu Y, Dai L, Lai X, Zhu F, Zhang D, Hu Y, Tkachev S, Chen B. Phase Transitions in Natural Vanadinite at High Pressures. Minerals. 2021; 11(11):1217.

Chicago/Turabian Style

Liu, Yingxin, Liyun Dai, Xiaojing Lai, Feng Zhu, Dongzhou Zhang, Yi Hu, Sergey Tkachev, and Bin Chen. 2021. "Phase Transitions in Natural Vanadinite at High Pressures" Minerals 11, no. 11: 1217.

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