The crystal structure of (NH4)2HfF6 was determined using a SMART 1000 CCD diffractometer (MoK α radiation, graphite monochromator). The unit cell parameters are a = 13.3902(7) Å, b = 7.6850(4) Å, c = 11.6731(6) Å, space group Pca21, and Z = 8; least-square refinement in the anisotropic approximation gave R 1 = 0.0299 and wR 2 = 0.0682. The compound is isostructural to (NH4)2ZrF6. The dynamics of the complex ions was examined in the temperature range 200–425 K; the energy of their activation was estimated. It was found that compounds of the (NH4)2AF6 type (A = Zr or Hf) can be classified as superionic conductors at 380 to 425 K.
Russian Journal of Coordination Chemistry – Springer Journals
Published: Oct 13, 2004
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