19F and203,205Tl NMR and structural transformations in chain ammonium and thallium hexafluorozirconates and hexafluorohafnates |
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| Authors: | V Ya Kavun S P Gabuda S G Kozlova R L Davidovich |
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| Institution: | (1) Institute of Chemistry, Far-East Branch, Russian Academy of Sciences, Vladivostok;(2) Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Russia |
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| Abstract: | Unusual structural transformations were observed in ammonium and thallium hexafluorozirconates and hexafluorohafnates at 300–420
K using high-resolution NMR for solids. It was established that at 300–350 K the initial chain structure of these compounds
of orthorhombic symmetry undergoes a transition to disordered state, and at higher temperatures it is transformed into an
ordered uniaxial structure which is similar to that of trigonal Cs2ZrF6 and Cs2HfF6. |
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