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Crystal chemistry of Eu-bearing tuite synthesized at high-pressure and high-temperature conditions

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Abstract

Tuite, γ-Ca3(PO4)2, is a potential host for rare-earth elements in the deep mantle. Eu-bearing tuite single crystals with chemical formulas of Ca2.93Eu0.04(PO4)2 and Ca2.88Eu0.07Na0.06(PO4)2 were synthesized at 16 GPa and 1600 °C, and their structures were investigated at room temperature with single-crystal X-ray diffraction. The structure refinements of Eu-bearing tuite indicate the preference of Eu3+ for the smaller 6-coordinated Ca1 site with a coupled vacancy due to the substitution of 2Eu3+ + □ → 3 Ca2+. In NaEu-bearing tuite, both Eu3+ and Na+ occupy the smaller 6-coordinated Ca1 site according to the coupled substitution of Eu3+ + Na+ → 2 Ca2+. The presence of Na results in more Eu2O3 in NaEu-bearing tuite, because the coupled substitution is energetically more favorable. REE-bearing tuite could be found on the Moon and the deep Earth’s mantle as a consequence of REE-bearing apatite or/and merrillite transformation under high-pressure and high-temperature conditions.

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Acknowledgements

We thank Prof. Taku Tsuchiya for his editorial handling. Critical comments and suggestion from Prof. Xiande Xie and an anonymous reviewer are helpful to improve the manuscript. This work was financially supported by the National Natural Science Foundation of China (Grant no. 41372040), Western Light Talents Training Program of CAS, Science and Technology Department of Guizhou Province (Grant nos. [2015] 2140 and [2016] 1157), Science Foundation Arizona, and Visiting Researcher’s Program of the Institute for Planetary Materials, Okayama University.

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Authors and Affiliations

  1. Key Laboratory of High-temperature and High-pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, Guizhou, China

    Shuangmeng Zhai & Weihong Xue

  2. Department of Geosciences, University of Arizona, Tucson, AZ, 85721-0077, USA

    Hexiong Yang, Shaunna M. Morrison & Robert T. Downs

  3. Center for High Pressure Science and Technology Advanced Research, Shanghai, 201203, China

    Eugene Huang

  4. Institute for Planetary Materials, Okayama University, Misasa, Tottori, 682-0193, Japan

    Daisuke Yamazaki

  5. Geophysical Laboratory, Carnegie Institution for Science, Washington, DC, 20015, USA

    Shaunna M. Morrison

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  1. Shuangmeng Zhai
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  2. Hexiong Yang
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  3. Weihong Xue
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  4. Eugene Huang
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Correspondence to Shuangmeng Zhai.

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Zhai, S., Yang, H., Xue, W. et al. Crystal chemistry of Eu-bearing tuite synthesized at high-pressure and high-temperature conditions. Phys Chem Minerals 46, 157–163 (2019). https://doi.org/10.1007/s00269-018-0994-6

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  • DOI: https://doi.org/10.1007/s00269-018-0994-6

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