Russian Journal of Inorganic Chemistry

, Volume 60, Issue 1, pp 16–22

Lanthanide effect on the formation and evolution of nanocrystalline structures in Ln2Hf2O7 compounds (Ln = Sm-Dy)

  • V. V. Popov
  • Ya. V. Zubavichus
  • A. P. Menushenkov
  • A. A. Yaroslavtsev
  • E. S. Kulik
  • A. A. Pisarev
  • N. A. Kolyshkin
Synthesis and Properties of Inorganic Compounds

DOI: 10.1134/S003602361501009X

Cite this article as:
Popov, V.V., Zubavichus, Y.V., Menushenkov, A.P. et al. Russ. J. Inorg. Chem. (2015) 60: 16. doi:10.1134/S003602361501009X

Abstract

X-ray diffraction with synchrotron radiation has been used for comparative analysis of crystal structure evolution in Ln2Hf2O7 (Ln = Sm-Dy) complex oxides with a fluorite-pyrochlore structure, synthesized by isothermal annealing of mixed hydroxides. It has been shown that heat treatment of the precursor in the temperature range 600–700°C initiates the formation of nanocrystallites with a fluorite structure. Long-range cationic ordering of the pyrochlore type appears in Ln2Hf2O7 (Ln = Sm-Tb) samples once a definite crystal size has been achieved at temperatures ≥1200°C. In Dy2Hf2O7 samples, a defect fluorite structure persists in the entire range of heat-treatment temperatures.

Copyright information

© Pleiades Publishing, Ltd. 2015

Authors and Affiliations

  • V. V. Popov
    • 1
  • Ya. V. Zubavichus
    • 2
  • A. P. Menushenkov
    • 1
  • A. A. Yaroslavtsev
    • 1
  • E. S. Kulik
    • 2
  • A. A. Pisarev
    • 1
  • N. A. Kolyshkin
    • 2
  1. 1.National Research Nuclear University MEPhIMoscowRussia
  2. 2.National Research Center Kurchatov InstituteMoscowRussia

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