Einkristalle von (NH₄)ZrF₅ und (NH₄)HfF₅ durch Oxidation von Zirconium und Hafnium mit (NH₄)HF₂

Synthesis and Crystal Structure of (NH₄)ZrF₅ and (NH₄)HfF₅ by Oxidation of Zirconium and Hafnium with (NH₄)HF₂

Colourless single crystals of NH₄ZrF₅ (1) and NH₄HfF₅ (2) are obtained by reaction of the respective metal powders with NH₄HF₂ (4 weeks) in sealed Monel metal containers at 450 °C. They crystallize with the monoclinic space group P2₁/c with (1/2) a = 778.16(14)/786.35(12), b = 790.75(9)/786.64(8), c = 792.44(12)/786.01(12), β = 119.177(12)/119.828(10) isotypic to TlZrF₅.