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- Title
Dependences of the density of <i>M</i><sub>1−x</sub><i>R</i><sub>x</sub>F<sub>2 + x</sub> and <i>R</i><sub>1−y</sub><i>M</i><sub>y</sub>F<sub>3−y</sub> single crystals (<i>M</i> = Ca, Sr, Ba, Cd, Pb; <i>R</i> means rare earth elements) on composition.
- Authors
Sorokin, N. I.; Krivandina, E. A.; Zhmurova, Z. I.
- Abstract
The density of single crystals of nonstoichiometric phases Ba 1 − xLa xF 2 + x (0 ≤ x ≤ 0.5) and Sr 0.8La 0.2 − xLu xF 2.2 (0 ≤ x ≤ 0.2) with the fluorite (CaF 2) structure type and R1 − ySr yF 3 − y ( R = Pr, Nd; 0 ≤ y ≤ 0.15) with the tysonite (LaF 3) structure type has been measured. Single crystals were grown from a melt by the Bridgman method. The measured concentration dependences of single crystal density are linear. The interstitial and vacancy models of defect formation in the fluorite and tysonite phases, respectively, are confirmed. To implement the composition control of single crystals of superionic conductors M1 − xRxF 2 + x and R1 − yMyF 3 − y in practice, calibration graphs of X-ray density in the MF 2- RF 3 systems ( M = Ca, Sr, Ba, Cd, Pb; R = La-Lu, Y) are plotted.
- Subjects
SINGLE crystals; RARE earth metals; NONSTOICHIOMETRIC compounds; INTERSTITIAL defects; FLUORITE; TYSONITE; SUPERIONIC conductors
- Publication
Crystallography Reports, 2013, Vol 58, Issue 6, p948
- ISSN
1063-7745
- Publication type
Article
- DOI
10.1134/S1063774513060217