Concentration dependences of the unit-cell parameters of nonstoichiometric fluorite-type Na0.5 − x R 0.5 + x F2 + 2x phases (R = rare-earth elements)

P P Fedorov,I I Buchinskaya,B P Sobolev,M D Val'Kovskii,V B Aleksandrov,O S Bondareva

doi:10.1134/1.1358401

Concentration dependences of the unit-cell parameters of nonstoichiometric fluorite-type Na0.5 − x R 0.5 + x F2 + 2x phases (R = rare-earth elements)

P P Fedorov, I I Buchinskaya + Show 4 more

https://doi.org/10.1134/1.1358401

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Journal: Crystallography Reports	Publication Date: Mar 1, 2001
Citations: 32

Affiliation: A.V. Shubnikov Institute of Crystallography, Russian Academy of Sciences, NS Kurnakova Institute of General and Inorganic Chemistry

#Crystal Ionic Radius #Fluorite-type Structure + Show 4 more

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Abstract

Unit-cell parameter a of the cubic phases with a varying composition Na0.5 − xR0.5 + xF2 + 2x (R = Gd-Lu and Y) and with a fluorite-type structure, is described within an accuracy of ±0.003 A, by the formula a = 4.454 + 0.874r3 + x(6.7238r3 − 7.259) where r3 is the Shannon “crystal ionic radius” R3+ at c.n. = 8.

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