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Reactions in the solid phase between silica and praeseodymium oxide

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Bulletin of the Academy of Sciences of the USSR, Division of chemical science Aims and scope

Summary

  1. 1.

    Silicates of composition Pr2O3·SiO2, 2Pr2O3·3SiO2, and Pr2O3·2SiO2 are formed by the interaction of praeseodymium oxide with silica.

  2. 2.

    The silicates can be obtained by interaction of silica with Pr2O11 in an atmosphere of hydrogen or of air.

  3. 3.

    At 1200–1300° in an atmosphere of hydrogen or air, orthosilicate is formed as the predominant reaction product phase, regardless of the ratio of praeseodymium oxide to silica in the initial mixture within the range 1∶1,2∶3, and 1∶2. The orthosilicate is unstable at the higher temperatures 1400–1650° and decomposes into the silicates Pr2O3·SiO2 and Pr2O3·2SiO2.

  4. 4.

    The pyrosilicate Pr2O3·2SiO2 is formed at 1400–1650° in a secondary stage of the reaction, by interaction of more basic praeseodymium silicates with silica. The oxyorthosilicate Pr2O3·SiO2, slightly contaminated with orthosilicate, can be produced at 1600–1650°.

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Literature cited

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Authors and Affiliations

  1. Institute of Silicate Chemistry of the Academy of Sciences of the USSR, USSR

    É. K. Keler, N. A. Godina & E. P. Savchenko

Authors
  1. É. K. Keler
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  2. N. A. Godina
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  3. E. P. Savchenko
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Keler, É.K., Godina, N.A. & Savchenko, E.P. Reactions in the solid phase between silica and praeseodymium oxide. Russ Chem Bull 10, 1619–1623 (1961). https://doi.org/10.1007/BF00911428

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  • DOI: https://doi.org/10.1007/BF00911428

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