Specific features of the crystal and local structures of compounds formed in the Dy2O3–HfO2 system

The crystal and local structures of compounds formed in the Dy 2 O 3 –HfO 2 system (at molar ratios from 1: 3 to 3: 1) in the course of isothermal annealing of X-ray amorphous mixed hydroxides at temperatures up to 1600°C have been studied. At the molar ratio Dy 2 O 3 : HfO 2 from 1: 3 to 1: 1, crys...

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Published in:Russian journal of inorganic chemistry 2016-09, Vol.61 (9), p.1135-1143
Main Authors: Popov, V. V., Menushenkov, A. P., Zubavichus, Ya. V., Yaroslavtsev, A. A., Leshchev, D. S., Kulik, E. S., Yastrebtsev, A. A., Pisarev, A. A., Korovin, S. A., Tsarenko, N. A.
Format: Article
Language:English
Subjects:
Cations
Chemistry
Chemistry and Materials Science
Crystal defects
Crystal structure
Crystallization
Fluorite
Hafnium oxide
Hydroxides
Inorganic Chemistry
Isothermal annealing
Physical Methods of Investigation
Solid solutions
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Summary:The crystal and local structures of compounds formed in the Dy 2 O 3 –HfO 2 system (at molar ratios from 1: 3 to 3: 1) in the course of isothermal annealing of X-ray amorphous mixed hydroxides at temperatures up to 1600°C have been studied. At the molar ratio Dy 2 O 3 : HfO 2 from 1: 3 to 1: 1, crystallization leads to formation of single-phase defect fluorite solid solutions n Dy 2 O 3 ∙ m HfO 2 with clearly pronounced nonequivalence of parameters of local environment of Dy 3+ and Hf 4+ cations. It has been found that Dy 2 H 2 O 7 (Dy 2 O 3 : HfO 2 = 1: 2) samples have a tendency to pyrochlore-type ordering in both the cationic and anionic sublattices.
ISSN:0036-0236
1531-8613
DOI:10.1134/S0036023616090175