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Local Structure of Highly Imperfect Fluorite-Derived R2TiO5-Based (R = Yb, Lu) Solid Solutions

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Abstract

Order–disorder structural transformations in xR2O3·(1 – х)TiO2 (R = Yb, Lu; х = 0.5–0.6) solid solutions with a highly imperfect fluorite-derived structure at 1600°C have been studied using monochromatic synchrotron X-ray diffraction and Raman spectroscopy. The results demonstrate that the synthesis process leads to the formation of two cubic phases identical in composition: a disordered fluorite-like (F) phase (Fm3m) and an ordered pyrochlore-like (P) phase (Fd3m), which is coherent with the disordered phase and consists of nanoscale (<100 Å) and nanocrystalline domains. The lattice parameters of these phases have been determined. The stability range of the solid solutions in the systems studied is 0.5 ≤ x ≤ 0.55. In the samples containing 0.55Yb2O3 and 0.5Lu2O3, the P-phase consists of nanodomains. The Raman spectra of the Yb2TiO5- and Lu2TiO5-based solid solutions contain broad bands at low and high frequencies, with peaks at 101, 175, 290, 346, 384, and 727 (115, 176, 320, and 745) cm–1, which correspond to the P- and F-phases, respectively. The formation of pyrochlore-like phases with different degrees of order in a fluorite matrix is due to the internal stress induced by the high density of structural defects in their unit cells. The materials obtained in this study have a large specific surface area and can be used as catalysts and catalyst supports.

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Authors and Affiliations

  1. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432, Chernogolovka, Noginskii raion, Moscow oblast, Russia

    L. P. Lyashenko

  2. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 119991, Moscow, Russia

    L. G. Shcherbakova & I. V. Kolbanev

  3. Institute of Solid State Physics, Russian Academy of Sciences, 142432, Chernogolovka, Noginskii raion, Moscow oblast, Russia

    I. I. Tartakovskii & A. A. Maksimov

  4. Kurchatov Institute National Research Centre, 123182, Moscow, Russia

    R. D. Svetogorov

  5. Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia

    Ya. V. Zubavichus

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  1. L. P. Lyashenko
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Lyashenko, L.P., Shcherbakova, L.G., Kolbanev, I.V. et al. Local Structure of Highly Imperfect Fluorite-Derived R2TiO5-Based (R = Yb, Lu) Solid Solutions. Inorg Mater 58, 379–388 (2022). https://doi.org/10.1134/S0020168522040100

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