Inorganic Materials

, Volume 54, Issue 3, pp 245–252 | Cite as

Order–Disorder Structural Transformations in Nanocrystalline Highly Imperfect Gd2MO5 (M = Zr and Hf) Fluorite Derivatives

  • L. P. Lyashenko
  • L. G. Shcherbakova
  • I. I. Tartakovskii
  • A. A. Maksimov
  • R. D. Svetogorov
  • Ya. V. Zubavichus
Article
  • 20 Downloads

Abstract

Order–disorder phenomena in nanocrystalline Gd2ZrO5 and Gd2HfO5 with highly imperfect fluorite- derived structures in the range 1000–1600°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 coherent phases identical in composition: a nanocrystalline disordered fluorite-like (F) phase (Fm3m) and a nanoparticulate ordered fluorite derivative (C1) (Ia3). Their lattice parameters have been determined. In the range 1000–1600°C, the Raman spectra of the Gd2ZrO5 and Gd2HfO5 materials contain broad bands in low- and high-frequency regions, at ~118 (108), 362 (353), and 670 (665) cm–1, which characterize the C1 and F phases, respectively.

Keywords

synchrotron X-ray diffraction Raman spectra scanning electron microscopy Gd2ZrO5 and Gd2HfO5 fluorite derivatives order–disorder structural transformations 

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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • L. P. Lyashenko
    • 1
  • L. G. Shcherbakova
    • 2
  • I. I. Tartakovskii
    • 3
  • A. A. Maksimov
    • 3
  • R. D. Svetogorov
    • 4
  • Ya. V. Zubavichus
    • 4
  1. 1.Institute of Problems of Chemical PhysicsRussian Academy of SciencesChernogolovka, Noginskii raion, Moscow oblastRussia
  2. 2.Semenov Institute of Chemical PhysicsRussian Academy of SciencesMoscowRussia
  3. 3.Institute of Solid State PhysicsRussian Academy of SciencesChernogolovka, Noginskii raion, Moscow oblastRussia
  4. 4.Kurchatov Institute National Research CentreMoscowRussia

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