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Structure Formation and Thermal Expansion of M0.5+xMgxZr2–x(PO4)3 (M = Cd, Sr) Phosphates

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Abstract—

M0.5+xMgxZr2–x(PO4)3 (M = Cd, Sr) phosphates have been synthesized via precipitation. In both systems, we have obtained limited solid solutions with the NaZr2(PO4)3 (NZP) structure (in the range 0 ≤ x ≤ 0.6 for M = Cd and 0 ≤ x ≤ 0.5 for M = Sr). Structure refinement of SrMg0.5Zr1.5(PO4)3 by the Rietveld method has shown that the Zr4+ and Mg2+ cations reside on framework sites, whereas Sr2+ ions occupy structural voids. The thermal expansion of the M0.5+xMgxZr2–x(PO4)3 (M = Cd, Sr) phosphates has been studied by X-ray diffraction in the temperature range 173–473 K. The results demonstrate that the incorporation of the larger (Sr2+) cations into voids in the NZP structure leads to a decrease in the magnitude of the axial linear thermal expansion coefficients. We have predicted and investigated a solid solution, Sr0.7Mg0.2Zr1.8(PO4)3, with a nearly zero thermal expansion anisotropy (0.55 × 10–6 K–1) and a small average thermal expansion coefficient (3.92 × 10–6 K–1).

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Funding

This work was supported by the Russian Foundation for Basic Research, project nos. 19-33-90075 and 18-29-12063.

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Authors and Affiliations

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

    E. R. Perova, P. A. Maiorov, E. A. Asabina & V. I. Pet’kov

  2. Moscow Institute of Steel and Alloys (National University of Science and Technology), 119049, Moscow, Russia

    A. M. Kovalskii

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  1. E. R. Perova
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  2. P. A. Maiorov
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  3. E. A. Asabina
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  4. V. I. Pet’kov
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  5. A. M. Kovalskii
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Correspondence to E. R. Perova.

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Translated by O. Tsarev

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Perova, E.R., Maiorov, P.A., Asabina, E.A. et al. Structure Formation and Thermal Expansion of M0.5+xMgxZr2–x(PO4)3 (M = Cd, Sr) Phosphates. Inorg Mater 57, 741–747 (2021). https://doi.org/10.1134/S0020168521070141

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