14596-11-3Relevant articles and documents
New heptafluorozirconates and -hafnates AIBIIZr(Hf) F7 (AI = Rb, Tl; BII = Ca, Cd) - Synthesis, structures, and structural relationships
Meddar, Lynda,El-Ghozzi, Malika,Avignant, Daniel
, p. 565 - 570 (2008)
Four new ABZrF7 heptafluorozirconates (A = Rb, Tl; B = Ca, Cd) and their homologous heptafluorohafnates, all colorless, orthorhombic Cmcm (n°63), Z = 4, have been synthesized by heating stoichiometric mixtures of RbF or TlF, CaF2 or CdF2 and ZrF4 (HfF 4) in sealed platinum tubes at temperature ranging from 550°C (Tl) to 600°C (Rb). The crystal structures of both RbCdZrF7 and TlCdZrF7 have been solved from single-crystal X-rays diffraction data. Rietveld refinements were performed from X-rays powder patterns for RbCaZrF7 and TlCaZrF7. In this series of heptafluorides, both B2+ and Zr4+ cations exhibit a pentagonal bipyramidal 7-coordination. Their structural relationships with other heptafluorozirconates AIBIIZrF7 as well as β-KYb 2F7 are discussed. RbCaZrF7: a = 6.863(1) A, b = 11.130(1) A, c = 8.485(1) A; TlCaZrF7: a = 6.868(1) A b = 11.165(1) A, c = 8.486(1) A; RbCdZrF 7: a = 6.780(1) A, b = 11.054(4) A, c = 8.420(4) A; TlCdZrF7: a = 6.784(3) A b = 11.099(2) A, c = 8.424(9) A.
