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Formation of nanocrystalline structures in the Ln2O3-MO2 systems (Ln = Gd, Dy; M = Zr, Hf)

  • Synthesis and Properties of Inorganic Compounds
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Abstract

The formation of (Ln3+)2(M4+)2O7 (Ln = Gd, Dy; M = Zr, Hf) nanocrystallites obtained by annealing mixed hydroxides LnM(OH)7 · nH2O (precursors) synthesized by coprecipitation has been studied by synchronous thermal analysis, X-ray diffraction (normal and anomalous diffraction of synchrotron radiation), and EXAFS. In the systems under consideration, heat treatment of the X-ray amorphous precursors leads to their dehydration, and at 600–700°C, nanocrystallites with an fcc structure of disordered fluorite start forming. A further increase in temperature is accompanied by crystallite growth (CDD) and considerable change in the local structure of the heat-treated compounds. The crystallization enthalpies and activation energies have been determined.

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Original Russian Text © V.V. Popov, V.F. Petrunin, S.A. Korovin, A.P. Menushenkov, O.V. Kashurnikova, R.V. Chernikov, A.A. Yaroslavtsev, Ya.V. Zubavichus, 2011, published in Zhurnal Neorganicheskoi Khimii, 2011, Vol. 56, No. 10, pp. 1617–1623.

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Popov, V.V., Petrunin, V.F., Korovin, S.A. et al. Formation of nanocrystalline structures in the Ln2O3-MO2 systems (Ln = Gd, Dy; M = Zr, Hf). Russ. J. Inorg. Chem. 56, 1538–1544 (2011). https://doi.org/10.1134/S0036023611100184

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  • DOI: https://doi.org/10.1134/S0036023611100184

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