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Phase Formation, Structure, and Thermal Expansion of Phosphates M0.5(1 + x)Fe x Ti2–x (PO4)3 (M = Mn, Zn)

  • Synthesis and Properties of Inorganic Compounds
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Abstract

Phosphates M0.5(1 + x)Fe x Ti2–x (PO4)3 (M = Mn, Zn; 0 ≤ x ≤ 2) were synthesized by coprecipitation of salts from aqueous solutions with subsequent heat treatment. Their phase formation was studied; fields of concentration and temperature stability of solid solutions of the NaZr2(PO4)3 (NZP) structural type were identified. Comparison of the results of this work with the previously obtained data on the phase formation of isoformular phosphates with M = Co, Ni, Cu showed that the size of the homogeneity regions of solid solutions in the systems M0.5(1 + x)Fe x Ti2–x (PO4)3 (M = Mn, Co, Ni, Cu, Zn) increases with increasing radius of the cation in the oxidation state +2. The crystal structure of phosphate MnFeTi(PO4)3 was studied. It was demonstrated that Fe3+ and Ti4+ are randomly distributed over positions in the framework of the NZP structure, and Mn2+ cations occupy extraframework positions of the M1 type within columns of polyhedra. The average thermal expansion coefficient αav = 4.8 × 10–6 °С–1 of MnFeTi(PO4)3 suggests that the studied phosphate is a medium-expandable substance.

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Authors and Affiliations

  1. Lobachevsky State University of Nizhny Novgorod—National Research University, pr. Gagarina 23, Nizhny Novgorod, 603950, Russia

    I. O. Glukhova, E. A. Asabina & V. I. Pet’kov

  2. Lomonosov Moscow State University, Vorob’evy gory 1, Moscow, 119991, Russia

    E. Yu. Borovikova

  3. National University of Science and Technology “MISIS”, Leninskii pr. 4, Moscow, 119991, Russia

    A. M. Koval’skii

Authors
  1. I. O. Glukhova
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  2. E. A. Asabina
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  3. V. I. Pet’kov
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  4. E. Yu. Borovikova
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  5. A. M. Koval’skii
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Corresponding author

Correspondence to E. A. Asabina.

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Original Russian Text © I.O. Glukhova, E.A. Asabina, V.I. Pet’kov, E.Yu. Borovikova, A.M. Koval’skii, 2016, published in Zhurnal Neorganicheskoi Khimii, 2016, Vol. 61, No. 6, pp. 717–723.

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Glukhova, I.O., Asabina, E.A., Pet’kov, V.I. et al. Phase Formation, Structure, and Thermal Expansion of Phosphates M0.5(1 + x)Fe x Ti2–x (PO4)3 (M = Mn, Zn). Russ. J. Inorg. Chem. 61, 681–687 (2016). https://doi.org/10.1134/S0036023616060085

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  • DOI: https://doi.org/10.1134/S0036023616060085

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