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- Title
Synthesis of Nonstoichiometric Samarium Fluoride SmF<sub>2 + x</sub>.
- Authors
Buchinskaya, I. I.; Karimov, D. N.; Ivanova, A. G.; Zykova, M. P.; Sobolev, B. P.
- Abstract
The products of interaction of SmF3 with metallic Sm0, Si, and molecular hydrogen in quartz, graphite, and molybdenum containers have been investigated by X-ray diffraction. It is shown that reduction occurs with the formation of nonstoichiometric cubic SmF2 + x (sp. gr. Fm3̅m, unit-cell parameter a = 5.8517(2) Å) with a content x = 0.108 only in the case of synthesis of SmF3 with metallic Sm0 in a quartz ampoule. The transformation of the SmF2 + x phase composition in air at room temperature has been studied for the first time. It is found that SmF2.108 passes into the superstructural phase Sm13F32-δ (sp. gr. R3̅) with the unit-cell parameters a = 14.7354(4) Å and c = 10.1156(4) Å for 60 days. The use of Sm0, Si, and H2 as reducing agents for SmF3 is inefficient because of the weak tendency of the latter to reduction: the process occurs also with a low yield of the Sm13F32-δ phase and of the α-SmF3-based phase as impurity in the case of direct reduction by hydrogen.
- Subjects
NONSTOICHIOMETRIC compounds; SAMARIUM compounds; HYDROGEN; GRAPHITE; X-ray diffraction; ORGANIC synthesis
- Publication
Crystallography Reports, 2018, Vol 63, Issue 5, p774
- ISSN
1063-7745
- Publication type
Article
- DOI
10.1134/S1063774518050073