Synthesis of inorganic material nanoparticles by water in oil (W/O) microemulsion method enables to produce small particles with narrow size distribution. Using this technique, we obtained well-defined 4-5 nm nanoparticles of precursors of lanthanide oxides (La₂O₃, CeO₂, Pr₆O₁₁, Tr₄O₇). Interactions of lanthanide oxide nanoparticles with SiO₂ were studied on example of Pr₆O₁₁-SiO₂ system by transmission electron microscopy (TEM) and X-ray diffraction (XRD). Two different preparation methods were used. In the first, precursor of praseodymium oxide was supported on amorphous SiO₂ by impregnation, followed by calcination in oxygen at 400⁰C, until Pr₆O₁₁-SiO₂ system (10 % mol Pr₆O₁₁ – 90 % mol SiO₂) was formed. As revealed by TEM the sample contained small Pr₆O₁₁ nanocrystals (4-5 nm) partly aggregated into clusters (10-100 nm). In the second case nanoparticles of praseodymium oxide precursor were immobilized into silica during synthesis, which prevented their agglomeration. As a result of calcination in oxygen at 400⁰C small amorphous particles of Pr⁺³ oxide (4-5 nm) uniformly embedded in SiO₂ were obtained. Solid state reactions and formation of Pr silicates in both systems were explored in oxidizing atmosphere at temperatures 800⁰C, 1000⁰C and 1100⁰C.

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