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Sol-Gel Synthesis, Thermal Behavior of Nanopowders and Chemical Stability of La1 – xHoxPO4 Ceramic Matrices

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Abstract

Nanosized powders of orthophosphates in the LaPO4–HoPO4–H2O system have been synthesized to determine the mutual solubility of LaPO4 · nH2O and HoPO4 · nH2O initial components and to obtain ceramic matrices by sintering them. Formation of hexagonal, monoclinic or tetragonal solid solutions was revealed, and their limits and thermal stability were determined. A series of limited hexagonal LaPO4 · nH2O-based solid solutions was observed within the 0 ≤ x ≤ 0.6 concentration range up to 600°C. Further they transformed to monoclinic LaPO4-based form within the 0 ≤ x ≤ 0.3 concentration range. Solubility of LaPO4 · nH2O and LaPO4 in tetragonal HoPO4(· nH2O) is lower (≤10 mol %). Specific surface area of La1–xHoxPO4 · nH2O powders was in the range of 90.5–165.0 m2/g depending on x. Leaching rate of La3+ and Ho3+ from La1–xHoxPO4 matrices in nitric acid solution (pH 1–2) was determined to be 10–5–10–2 g/(cm2 day) for both ions.

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Authors and Affiliations

  1. Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, St. Petersburg, 199034, Russia

    L. P. Mezentseva, A. V. Osipov, V. L. Ugolkov, T. P. Maslennikova & A. V. Yakovlev

  2. Saint-Petersburg State Institute of Technology (Technical University), St. Petersburg, 190013, Russia

    A. A. Akatov & V. A. Doilnitsyn

Authors
  1. L. P. Mezentseva
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  2. A. V. Osipov
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  3. V. L. Ugolkov
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  4. A. A. Akatov
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  5. V. A. Doilnitsyn
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  6. T. P. Maslennikova
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  7. A. V. Yakovlev
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Correspondence to L. P. Mezentseva.

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Mezentseva, L.P., Osipov, A.V., Ugolkov, V.L. et al. Sol-Gel Synthesis, Thermal Behavior of Nanopowders and Chemical Stability of La1 – xHoxPO4 Ceramic Matrices. Glass Phys Chem 44, 440–449 (2018). https://doi.org/10.1134/S1087659618050127

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  • DOI: https://doi.org/10.1134/S1087659618050127

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