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Synthesis, Structure, and Thermal Expansion of Triple Phosphates of Potassium–Strontium–Rare Earth Elements

  • SYNTHESIS AND PROPERTIES OF INORGANIC COMPOUNDS
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Abstract

Polycrystalline phases of variable composition KxSr12 – 2xR4 + x(PO4)12 (R = Nd, Eu, and Gd; 0 ≤ x ≤ 4) with the structure of the mineral eulytite (space group I\(\overline 4 \)3d) have been synthesized by evaporation of the salt solution followed by heat treatment. Their structures have been studied by X-ray powder diffraction and IR spectroscopy, and electron probe studies have been carried out. The structure of KSr10Eu5(PO4)12 has been refined; it has been found that the neutral framework is formed by edge-linked metal-oxygen octahedra (K,Sr,Eu)O6 with PO4 tetrahedra located between them and attached to the octahedra by oxygen vertices. At temperature change, phosphates expand uniformly in all directions: αа = αb = αc = (9−12) × 10−6 K−1 without undergoing polymorphic transitions.

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Funding

This work was supported by the Russian Foundation for Basic Research (project no. 18-29-12063).

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Authors and Affiliations

  1. National Research Lobachevsky State University of Nizhny Novgorod, 603950, Nizhny Novgorod, Russia

    V. I. Pet’kov, A. I. Bokov & E. A. Asabina

  2. Moscow State University, 119991, Moscow, Russia

    E. Y. Borovikova

Authors
  1. V. I. Pet’kov
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  2. A. I. Bokov
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  3. E. A. Asabina
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  4. E. Y. Borovikova
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Correspondence to V. I. Pet’kov.

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Translated by V. Avdeeva

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Pet’kov, V.I., Bokov, A.I., Asabina, E.A. et al. Synthesis, Structure, and Thermal Expansion of Triple Phosphates of Potassium–Strontium–Rare Earth Elements. Russ. J. Inorg. Chem. 66, 799–805 (2021). https://doi.org/10.1134/S0036023621060152

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  • DOI: https://doi.org/10.1134/S0036023621060152

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