Title: Les pyrochlores AIB2X6: Mise en evidence de l'occupation par le cation AI de nouvelles positions cristallographiques dans le groupe d'espace fd3m
Abstract: In AIB2X6 pyrochlores—AI = Pb, Tl; X = O, F— the AI ions occupe 32e positions with a probability of 25% instead of the 8b positions as it was previously described; this results from the observations of very weak X-diffraction peaks provided by planes such as h = 4n, k = 4n, l = 4n + 2, visible on single crystals photographs of RbCoCrF6, RbNb2O5F, TlNb2O5F; this displacement of AI with respect to the 8b position -about 0,6 Å for Tl+ and 0,4 Å for Rb+ - is in agreement with the great size of the 8b cavity -about 1,80 Å-. However Cs+, the radius of which is well adapted to this cavity, is not significantly displaced in homologous compounds.
Publication Year: 1973
Publication Date: 1973-04-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 44
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