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Thermal stability and compressibility of bastnaesite

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Bastnaesite (Ce0.50La0.25Nd0.20Pr0.05)CO3F is an interesting pattern family of (CO3)2− and F co-existing phases, which is a meaningful sample to study the influence of multiple volatiles on minerals. Thermal stability of bastnaesite has been investigated by thermogravimetric experiment and in situ high-temperature Raman. The results demonstrate that bastnaesite undergoes a decarbonization transition at above 673 K. The isobaric-mode Grüneisen parameters range from 0.04 to 2.28. The compressibility of bastnaesite has been investigated by synchrotron radiation X-ray diffraction and Raman spectroscopy combined with diamond anvil cells up to 19.2 GPa at room temperature. Isothermal pressure–volume relationship of bastnaesite is fitted to the second-order Birch–Murnaghan equation of state with V0 = 430.87(3) Å3, K0 = 118.35(1) GPa. Its axial compressibility presents anisotropic, attributed to the rigid (CO3)2− group parallel to c-axis. Its isothermal-mode Grüneisen parameters and intrinsic anharmonic-mode parameters range from 0.23 to 1.91 and− 3.5 × 10−5 K−1 to 0.82 × 10−5 K−1, respectively. The presence of F can largely enhance the thermal stability and incompressibility of minerals.

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X. Wu acknowledges financial support from the National Science Foundation of China (41827802) and use of EPMA in the Key Laboratory of Submarine Geosciences, State Oceanic Administration, China. This work also supported by the Fundamental Research Funds (Grant No CUGL170218) for the Central Universities, China University of Geosciences (Wuhan).

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Correspondence to Xiang Wu.

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Li, X., Liu, Y., Song, H. et al. Thermal stability and compressibility of bastnaesite. Phys Chem Minerals 47, 13 (2020). https://doi.org/10.1007/s00269-020-01084-9

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  • Bastnaesite
  • Fluorocarbonates
  • Thermal stability
  • Compressibility
  • High temperature and high pressure