Citation: Aleonard, S; Lambert, B; Pannetier, J; Gorius, M F; Roux, M T (1985). Etude par diffraction neutronique de la phase Cs~4-x~ Yb~12~ F~40-x~ (0 <= X <=1): Hypothese Structurale.. Journal of Solid State Chemistry, 58, pp. 226-232.
Formula: Cs3.4 F39.4 Yb12
Chemical name:Caesium ytterbium fluoride (3.4/12/39.4) - prepared at T = 1373 K