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


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2011-10-11

AUTHORS

V. V. Popov, V. F. Petrunin, S. A. Korovin, A. P. Menushenkov, O. V. Kashurnikova, R. V. Chernikov, A. A. Yaroslavtsev, Ya. V. Zubavichus

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. More... »

PAGES

1538

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s0036023611100184

DOI

http://dx.doi.org/10.1134/s0036023611100184

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1018886623


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