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Preparation and Structure of New Orthophosphates Isostructural with the Mineral Langbeinite: A2R1.5Ta0.5(PO4)3 (A = K, Rb; R = Ga, Gd, Dy, Ho, Er, Yb)

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Inorganic Materials Aims and scope

Abstract—

New orthophosphates with the general formula A2R1.5Ta0.5(PO4)3 (where A = K or Rb and R = Ga, Gd, Dy, Ho, Er, or Yb) have been prepared by solid-state reactions and characterized by IR spectroscopy and X-ray diffraction. The results demonstrate that they crystallize in the structure of the mineral langbeinite (sp. gr. P213) and that their cubic cell parameter increases with increasing lanthanide ionic radius. The crystal structure of K2Dy1.5Ta0.5(PO4)3 has been refined using neutron powder diffraction data. The potassium and dysprosium cations in this phosphate have been shown to be distributed at random over framework sites. The synthesized compounds are of interest as crystalline single-phase mineral-like matrices for prolonged isolation of dangerous radionuclides from the biosphere.

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ACKNOWLEDGMENTS

We are grateful to V.S. Kurazhkovskaya for measuring the IR spectra.

Funding

This work was supported by the Russian Science Foundation, project no. 21-13-00308.

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Authors and Affiliations

  1. Lobachevsky State University, 603022, Nizhny Novgorod, Russia

    A. K. Koryttseva, A. I. Orlova, S. V. Nagornova & N. A. Sedova

  2. Frank Laboratory, Joint Institute for Nuclear Research, 141980, Dubna, Moscow oblast, Russia

    A. I. Beskrovnyi

Authors
  1. A. K. Koryttseva
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  2. A. I. Orlova
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  3. S. V. Nagornova
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  4. N. A. Sedova
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  5. A. I. Beskrovnyi
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Correspondence to A. K. Koryttseva.

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Translated by O. Tsarev

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Koryttseva, A.K., Orlova, A.I., Nagornova, S.V. et al. Preparation and Structure of New Orthophosphates Isostructural with the Mineral Langbeinite: A2R1.5Ta0.5(PO4)3 (A = K, Rb; R = Ga, Gd, Dy, Ho, Er, Yb). Inorg Mater 58, 356–363 (2022). https://doi.org/10.1134/S0020168522040069

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