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Equation of state of elbaite at high pressure up to 21.1 GPa and room temperature

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Abstract

The equation of the state of a natural elbaite sample has been investigated at room temperature and up to 21.1 GPa for the first time using in situ synchrotron X-ray diffraction in this study. No phase transition is observed on elbaite over the experimental pressure range. The pressure–volume data were fitted by the third-order Birch-Murnaghan equation of state (EoS) with the zero-pressure unit-cell volume V0 = 1540.7 (6) Å3, the zero-pressure bulk modulus KT0 = 114.7 (7) GPa, and its pressure derivative K'T0 = 4.2 (1), while obtained V0 = 1540.1 (4) Å3 and KT0 = 116.4 (4) GPa when fixed K'T0 = 4. Furthermore, the axial compressional behavior of elbaite was also fitted with a linearized third-order Birch-Murnaghan EoS, the obtained axial moduli for a-axis and c-axis are Ka0 = 201 (4) GPa and Kc0 = 60 (1) GPa, respectively. The axial compressibilities of a-axis and c-axis are βa = 1.66 × 10–3 GPa−1 and βc = 5.56 × 10–3 GPa−1 with an anisotropic ratio of βa: βc = 0.30: 1.00, which shows an intense axial compression anisotropy. The potential influencing factors on the bulk moduli and the anisotropic linear compressibilities of tourmalines were further discussed.

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Acknowledgements

This project was supported by the National Natural Science Foundation of China (U2032118 and 42172048), the Youth Innovation Promotion Association CAS (Dawei Fan, 2018434), the Chinese Academy of Sciences “Light of West China” Program (2019), the Science and Technology Foundation of Guizhou Province (QKHJC-ZK[2021]ZD042), and the Guizhou Provincial 2020 Science and Technology Subsidies (No. GZ2020SIG). The high-pressure XRD experiments were conducted at the BL15U1 of the Shanghai Synchrotron Radiation Facility (SSRF). We acknowledge H.Y. Su for the neon gas loading assistance.

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Correspondence to Wenge Zhou.

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Chen, W., Huang, S., Ye, Z. et al. Equation of state of elbaite at high pressure up to 21.1 GPa and room temperature. Phys Chem Minerals 49, 27 (2022). https://doi.org/10.1007/s00269-022-01201-w

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  • DOI: https://doi.org/10.1007/s00269-022-01201-w

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