Interactions in the NdF3-Nd2O3-MF 2 (M = Ba, Sr) systems

K. N. Zolotova, I. V. Kolbanev, E. I. Ardashnikova, A. M. Abakumov, V. A. Dolgikh

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2 Citations (Scopus)

Abstract

Isothermal anneals (at 873 K) and powder X-ray diffraction were used to study isothermal sections of phase diagrams of the NdF3-Nd 2O3-MF2 (M = Ba, Sr) systems. In studying the NdF3-Nd2O3-BaF2 system, classical solid-phase synthesis was supplemented with mechanochemical activation of feedstock mixtures or BaF2 activated with gaseous hydrogen fluoride was used. In both systems, a solid solution with the fluorite structure based on MF2 and NdOF phases, a solid solution with the tysonite structure based on NdF3, and an ordered fluorite-related phase Ba 4Nd3F17 were found. The NdOF-based solid solutions were shown to have polymorphism: βtrig ai αcub at ≈800 K; a new trigonal phase of these solid solutions has been discovered. The effect of a dimensional factor ( {R-{Ba^{2 + } } > R-{Sr^{2 + } } } \right) on phase formation and unit cell parameters of the solid solutions was traced.

Original languageEnglish
Pages (from-to)1625-1633
Number of pages9
JournalRussian Journal of Inorganic Chemistry
Volume56
Issue number10
DOIs
Publication statusPublished - Oct 2011
Externally publishedYes

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