Abstract
The metamict fergusonite-(Y) with the formula (Y0.70Ln0.20Ca0.13U0.02Th0.02)∑1.07(Nb0.72Ta0.17W0.06Ti0.04)∑1(O3.97(OH)0.11F0.08Cl0.03) · 2.12H2O from the Blyumovskaya Pit, Ilmeny Mountains (Russia) was studied by the means of high-temperature X-ray diffraction, thermal analysis, Raman spectroscopy and microprobe analysis. Thermal expansion was studied for both tetragonal (α-fergusonite) and monoclinic (β-fergusonite) polymorphs. The expansion of β-fergusonite is anisotropic and strongly negative along the α33. In contrast, α-fergusonite exhibits a relatively isotropic thermal expansion upon heating. The volume CTE (αV) for β-fergusonite varies in the range 22.87(94)–75.4(2.5) × 10–6 ºC−1, whereas α-fergusonite has αV = 32.33(57)–31.66(49) × 10-6 ºC−1 in the temperature range 850–1200 °C. After heating to 1100 °C, the mineral develops a porous texture, and the radioactivity is reduced by 37%, which can be attributed to the partial volatilization of some radionuclides. In situ experiments revealed the complete sequence of the thermal evolution of the metamict fergusonite-(Y) for the first time.
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Acknowledgements
We thank Anatoly Zaitsev for the valuable discussions on fergusonite-(Y) microprobe data. Technical support by the SPbSU X-ray diffraction and Geomodel Resource Centers (No. 103752493) is gratefully acknowledged.
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R. Chen and O.I. Siidra: conceptualization. R. Chen and all other coauthors: writing—original draft preparation.. O.I. Siidra: writing—review and editing. R. Chen, V.A. Firsova, O.I. Siidra: X-ray diffraction, thermal expansion calculation. N.S. Vlasenko and R. Chen: electron microprobe analysis.. V.N. Bocharov and R. Chen: Raman spectroscopy. V.L. Ugolkov and R. Chen: thermal analysis. I.V. Tokarev: radioactivity measurements. O.I. Siidra, A.M. Arevalo-Lopez, M. Colmont: general supervision.
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Chen, R., Siidra, O.I., Firsova, V.A. et al. Thermal evolution of the metamict fergusonite-(Y). Phys Chem Minerals 51, 8 (2024). https://doi.org/10.1007/s00269-023-01263-4
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DOI: https://doi.org/10.1007/s00269-023-01263-4